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From anat...@apache.org
Subject [04/10] incubator-tamaya-sandbox git commit: TAMAYA-182: Adapted modules to new builder patter changes, including tests. Fixed compile errors, or excluded modules from compilation (see root pom).
Date Sun, 30 Oct 2016 17:25:46 GMT
http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/usagetracker/src/test/resources/examples/configmodel.xml
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diff --git a/usagetracker/src/test/resources/examples/configmodel.xml b/usagetracker/src/test/resources/examples/configmodel.xml
new file mode 100644
index 0000000..f23f783
--- /dev/null
+++ b/usagetracker/src/test/resources/examples/configmodel.xml
@@ -0,0 +1,97 @@
+<!--
+Licensed to the Apache Software Foundation (ASF) under one
+or more contributor license agreements.  See the NOTICE file
+distributed with this work for additional information
+regarding copyright ownership.  The ASF licenses this file
+to you under the Apache License, Version 2.0 (the
+"License"); you may not use this file except in compliance
+with the License.  You may obtain a copy of the License at
+
+   http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing,
+software distributed under the License is distributed on an
+"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+KIND, either express or implied.  See the License for the
+specific language governing permissions and limitations
+under the License.
+-->
+
+<!--################################################################################
+# Example of a configuration metamodel expressed via YAML(tm).
+#   Structure is shown through indentation (one or more spaces).
+#   Sequence items are denoted by a dash,
+#   key value pairs within a map are separated by a colon.
+#################################################################################-->
+
+<!--################################################################################
+# Metamodel information
+#################################################################################-->
+
+<configuration>
+    <section name="{model}" __provider="ConfigModel Extension" version="1.0" __release-date="2001-01-23"
+            author="Anatole Tresch">
+        <!-- model-format>alternate format reader type</model-format -->
+        <__description>Late afternoon is best.
+            Backup contact is Nancy.
+        </__description>
+
+        <!--################################################################################
+        # Description of Configuration Sections (minimal, can be extended by other modules).
+        #################################################################################-->
+        <section name="a">
+            <param name="params">
+                <type>String</type>
+                <required>true</required>
+                <description>a required parameter</description>
+            </param>
+            <param name="paramInt">
+                <ref>MyNumber</ref>
+                <required>true</required>
+                <description>an optional parameter (default)</description>
+            </param>
+            <param name="_number">
+                <type>Integer</type>
+                <deprecated>true</deprecated>
+                <mappedto>a.paramInt</mappedto>
+            </param>
+            <section name="b.c">
+                <description>Just a test section.</description>
+                <section name="aRequiredSection">
+                    <description>A section containing required parameters is called a required section.
+                        Sections can also explicitly be defined to be required, but without
+                        specifying the paramteres to be contained.
+                    </description>
+                </section>
+            </section>
+        </section>
+
+        <section name="a.b.c.aRequiredSection.subsection">
+            <param name="param0" type="String">a minmally documented String parameter</param>
+            <!-- # A minmally defined String parameter -->
+            <param name="param00">
+                <type>String</type>
+            </param>
+            <param name="param1">
+                <type>String</type>
+                <required>true</required>
+                <description>a required parameter</description>description>
+            </param>
+            <param name="intParam">
+                <type>Integer</type>
+                <description>an optional parameter (default)</description>
+            </param>
+            <section name="b.c">
+                <description>Just a test section.</description>
+            </section>
+        </section>
+        <section name="a.b.c.aRequiredSection.nonempty-subsection">
+            <required>true</required>
+        </section>
+        <section name="a.b.c.aRequiredSection.optional-subsection"/>
+        <section name="a.b.c.aRequiredSection.aValidatedSection">
+            <configModels>org.apache.tamaya.model.configModel.MaxItemValidator?max=3"</configModels>
+            <description>A configModel section.</description>
+        </section>
+    </section>
+</configuration>

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/usagetracker/src/test/resources/examples/configmodel.yaml
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diff --git a/usagetracker/src/test/resources/examples/configmodel.yaml b/usagetracker/src/test/resources/examples/configmodel.yaml
new file mode 100644
index 0000000..041c801
--- /dev/null
+++ b/usagetracker/src/test/resources/examples/configmodel.yaml
@@ -0,0 +1,106 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy current the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+##################################################################################
+# Example of a configuration metamodel expressed via YAML(tm).
+#   Structure is shown through indentation (one or more spaces).
+#   Sequence items are denoted by a dash,
+#   key value pairs within a map are separated by a colon.
+####################################################################################
+
+####################################################################################
+# Metamodel information
+####################################################################################
+{model}: {
+  __name           :  'testmodel',
+  __provider       :  'ValidationProviderSpi Extension',
+  __version        :  '1.0',
+  __release-date   :  2001-01-23,
+  __author         :  'Anatole Tresch',
+  # model-format: 'alternate format reader type'
+  __description: >
+    Late afternoon is best.
+    Backup contact is Nancy.
+}
+
+####################################################################################
+# Description of Configuration Sections (minimal, can be extended by other modules).
+####################################################################################
+---
+{model}.a.params2: {
+  type          : 'String',
+  required      : true,
+  description   : 'a required parameter',
+  paramInt: 'Integer',                 'an optional parameter (default)',
+}
+---
+{model}.a.paramInt: {
+  type          : 'Integer',
+  description   : 'an optional parameter (default)',
+}
+---
+{model}.a.b.c: {
+  description:  'Just a test section.'
+}
+---
+{model}.a.b.c.aRequiredSection: {
+  required: true,
+  description: |
+             A section containing required parameters is called a required section.
+             Sections can also explicitly be defined to be required, but without
+             specifying the paramteres to be contained.,
+}
+---
+{model}.a.b.c.aRequiredSection.subsection: {
+  param0: {
+    type: 'String',
+    description: 'a minmally documented String parameter}'
+  },                 ,
+  param00:{
+    type: 'String'        # A minmally defined String parameter
+  },
+  param1: {
+    tpye: 'String',
+    required: true,
+    description: 'a required parameter'
+  },
+  intParam: {
+    type: 'Integer',
+    description: 'an optional parameter (default)'
+  }
+}
+...
+
+---
+{model}.a.b.c.aRequiredSection.nonempty-subsection: {
+  required: true
+}
+...
+
+---
+{model}.a.b.c.aRequiredSection.optional-subsection: {}
+...
+
+---
+{model}.a.b.c.aRequiredSection.aValidatedSection: {
+  description: 'A configModel section.',
+  configModels: 'org.apache.tamaya.model.configModel.MaxItemValidator?max=3'
+}
+
+

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/ConfigModel.java
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diff --git a/validation/src/main/java/org/apache/tamaya/validation/ConfigModel.java b/validation/src/main/java/org/apache/tamaya/validation/ConfigModel.java
new file mode 100644
index 0000000..a9c58f0
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/ConfigModel.java
@@ -0,0 +1,78 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation;
+
+import org.apache.tamaya.Configuration;
+
+import java.util.Collection;
+
+/**
+ * Base structure describing a validated item, by default a parameter or a section.
+ */
+public interface ConfigModel {
+
+    /**
+     * Access the owner.
+     * @return the owner of this model, never null.
+     */
+    String getOwner();
+
+    /**
+     * Get the type of item that is modelled.
+     * @return the modelled type, never null.
+     */
+    ModelTarget getType();
+
+    /**
+     * Get the item's name, it should minimally describe the validation. Examples are:
+     * <pre>
+     *     Sections: a.b.c
+     *     Params: a.b.c.paramName
+     *     Filter: a.b.c.FilterImplClass
+     *     Dependency: mydepClassname
+     *     CombinationPolicy: a.b.c.MyCombinationPolicyClass
+     * </pre>
+     * @return the item's name.
+     */
+    String getName();
+
+    /**
+     * Check if this validation is a required one.
+     * @return true, if this validation is required.
+     */
+    boolean isRequired();
+
+    /**
+     * Get an description of the item, using the default locale. The description is basically optional
+     * though it is higly recommended to provide a description, so the validation issues is well
+     * resolvable.
+     *
+     * @return the description required, or null.
+     */
+    String getDescription();
+
+    /**
+     * Validates the item and all its children against the given configuration.
+     *
+     * @param config the configuration to be validated against, not null.
+     * @return the validation result, or null, if not applicable.
+     */
+    Collection<Validation> validate(Configuration config);
+
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/ConfigModelManager.java
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diff --git a/validation/src/main/java/org/apache/tamaya/validation/ConfigModelManager.java b/validation/src/main/java/org/apache/tamaya/validation/ConfigModelManager.java
new file mode 100644
index 0000000..0f3cce5
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/ConfigModelManager.java
@@ -0,0 +1,298 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation;
+
+import org.apache.tamaya.Configuration;
+import org.apache.tamaya.ConfigurationProvider;
+import org.apache.tamaya.validation.spi.ConfigDocumentationMBean;
+import org.apache.tamaya.validation.spi.ModelProviderSpi;
+import org.apache.tamaya.spi.ServiceContextManager;
+
+import javax.management.InstanceNotFoundException;
+import javax.management.MBeanServer;
+import javax.management.ObjectName;
+import java.lang.management.ManagementFactory;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Validator accessor to validate the current configuration.
+ */
+public final class ConfigModelManager {
+
+    /** The logger used. */
+    private static final Logger LOG = Logger.getLogger(ConfigModelManager.class.getName());
+
+    /**
+     * Singleton constructor.
+     */
+    private ConfigModelManager() {
+    }
+
+    /**
+     * Access the usage statistics for the recorded uses of configuration.
+     * @return usage statistics
+     */
+    public static String getConfigInfoText(){
+        StringBuilder b = new StringBuilder();
+        List<ConfigModel> models = new ArrayList<>(getModels());
+        Collections.sort(models, new Comparator<ConfigModel>() {
+            @Override
+            public int compare(ConfigModel k1, ConfigModel k2) {
+                return k2.getName().compareTo(k2.getName());
+            }
+        });
+        b.append("TYPE    OWNER      NAME                                              MANDATORY   DESCRIPTION\n");
+        b.append("-----------------------------------------------------------------------------------------------------\n");
+        for(ConfigModel model:models){
+            switch(model.getType()){
+                case Parameter:
+                    b.append("PARAM   ");
+                    break;
+                case Section:
+                    b.append("SECTION ");
+                    break;
+                case Group:
+                    b.append("GROUP   ");
+                    break;
+                default:
+                    break;
+            }
+            b.append(formatWithFixedLength(model.getOwner(), 10)).append(' ');
+            b.append(formatWithFixedLength(model.getName(), 50));
+            if(model.isRequired()){
+                b.append(formatWithFixedLength("yes", 12));
+            }else{
+                b.append(formatWithFixedLength("no", 12));
+            }
+            if(model.getDescription()!=null){
+                b.append(model.getDescription().replace("\n", "\\\n").replace("\"", "'")).append("\"");
+            }
+            b.append("\n");
+        }
+        return b.toString();
+    }
+
+    private static String formatWithFixedLength(String name, int targetLength) {
+        targetLength = targetLength-1;
+        StringBuilder b = new StringBuilder();
+        if(name.length() > targetLength){
+            name = name.substring(0, targetLength);
+        }
+        b.append(name);
+        for(int i=0;i<(targetLength-name.length());i++){
+            b.append(' ');
+        }
+        b.append(' ');
+        return b.toString();
+    }
+
+    /**
+     * Get the validations defined.
+     *
+     * @return the sections defined, never null.
+     */
+    public static Collection<ConfigModel> getModels() {
+        List<ConfigModel> result = new ArrayList<>();
+        for (ModelProviderSpi model : ServiceContextManager.getServiceContext().getServices(ModelProviderSpi.class)) {
+            result.addAll(model.getConfigModels());
+        }
+        return result;
+    }
+
+
+    /**
+     * Find the validations by matching the validation's name against the given model type.
+     * 
+     * @param name the name to use, not null.
+     * @param modelType classname of the target model type.  
+     * @param <T> type of the model to filter for.
+     * @return the sections defined, never null.
+     */
+    public static <T extends ConfigModel> T getModel(String name, Class<T> modelType) {
+        for (ModelProviderSpi model : ServiceContextManager.getServiceContext().getServices(ModelProviderSpi.class)) {
+            for(ConfigModel configModel : model.getConfigModels()) {
+                if(configModel.getName().equals(name) && configModel.getClass().equals(modelType)) {
+                    return modelType.cast(configModel);
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Find the validations by checking the validation's name using the given regular expression.
+     * @param namePattern the regular expression to use, not null.
+     * @param targets the target types only to be returned (optional).
+     * @return the sections defined, never null.
+     */
+    public static Collection<ConfigModel> findModels(String namePattern, ModelTarget... targets) {
+        List<ConfigModel> result = new ArrayList<>();
+        for (ModelProviderSpi model : ServiceContextManager.getServiceContext().getServices(ModelProviderSpi.class)) {
+            for(ConfigModel configModel : model.getConfigModels()) {
+                if(configModel.getName().matches(namePattern)) {
+                    if(targets.length>0){
+                        for(ModelTarget tgt:targets){
+                            if(configModel.getType().equals(tgt)){
+                                result.add(configModel);
+                                break;
+                            }
+                        }
+                    }else {
+                        result.add(configModel);
+                    }
+                }
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Validates the current configuration.
+     *
+     * @return the validation results, never null.
+     */
+    public static Collection<Validation> validate() {
+        return validate(false);
+    }
+
+    /**
+     * Validates the current configuration.
+     * @param showUndefined show any unknown parameters.
+     * @return the validation results, never null.
+     */
+    public static Collection<Validation> validate(boolean showUndefined) {
+        return validate(ConfigurationProvider.getConfiguration(), showUndefined);
+    }
+
+    /**
+     * Validates the given configuration.
+     *
+     * @param config the configuration to be validated against, not null.
+     * @return the validation results, never null.
+     */
+    public static Collection<Validation> validate(Configuration config) {
+        return validate(config, false);
+    }
+
+    /**
+     * Validates the given configuration.
+     *
+     * @param config the configuration to be validated against, not null.
+     * @param showUndefined allows filtering for undefined configuration elements.
+     * @return the validation results, never null.
+     */
+    public static Collection<Validation> validate(Configuration config, boolean showUndefined) {
+        List<Validation> result = new ArrayList<>();
+        for (ConfigModel defConf : getModels()) {
+            result.addAll(defConf.validate(config));
+        }
+        if(showUndefined){
+            Map<String,String> map = new HashMap<>(config.getProperties());
+            Set<String> areas = extractTransitiveAreas(map.keySet());
+            for (ConfigModel defConf : getModels()) {
+                if(ModelTarget.Section.equals(defConf.getType())){
+                    for (Iterator<String> iter = areas.iterator();iter.hasNext();){
+                        String area = iter.next();
+                        if(area.matches(defConf.getName())){
+                            iter.remove();
+                        }
+                    }
+                }
+                if(ModelTarget.Parameter.equals(defConf.getType())){
+                    map.remove(defConf.getName());
+                }
+            }
+            outer:for(Map.Entry<String,String> entry:map.entrySet()){
+                for (ConfigModel defConf : getModels()) {
+                    if(ModelTarget.Section.equals(defConf.getType())){
+                        if(defConf.getName().endsWith(".*") && entry.getKey().matches(defConf.getName())){
+                            // Ignore parameters that are part of transitive section.
+                            continue outer;
+                        }
+                    }
+                }
+                result.add(Validation.ofUndefined("<auto>", entry.getKey(), ModelTarget.Parameter));
+            }
+            for(String area:areas){
+                result.add(Validation.ofUndefined("<auto>", area, ModelTarget.Section));
+            }
+        }
+        return result;
+    }
+
+    private static java.util.Set<java.lang.String> extractTransitiveAreas(Set<String> keys) {
+        Set<String> transitiveClosure = new HashSet<>();
+        for(String key:keys){
+            int index = key.lastIndexOf('.');
+            while(index>0){
+                String areaKey = key.substring(0,index);
+                transitiveClosure.add(areaKey);
+                index = areaKey.lastIndexOf('.');
+            }
+        }
+        return transitiveClosure;
+    }
+
+
+    /**
+     * Registers the {@link ConfigDocumentationMBean} mbean for accessing config documentation into the local platform
+     * mbean server.
+     */
+    public static void registerMBean() {
+        registerMBean(null);
+    }
+
+    /**
+     * Registers the {@link ConfigDocumentationMBean} mbean for accessing config documentation into the local platform
+     * mbean server.
+     * 
+     * @param context allows to specify an additional MBean context, maybe {@code null}. 
+     */
+    public static void registerMBean(String context) {
+        try{
+            ConfigDocumentationMBean configMbean = ServiceContextManager.getServiceContext()
+                    .getService(ConfigDocumentationMBean.class);
+            MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
+            ObjectName on = context==null?new ObjectName("org.apache.tamaya.model:type=ConfigDocumentationMBean"):
+                    new ObjectName("org.apache.tamaya.model:type=ConfigDocumentationMBean,context="+context);
+            try{
+                mbs.getMBeanInfo(on);
+                LOG.warning("Cannot register mbean " + on + ": already existing.");
+            } catch(InstanceNotFoundException e) {
+                LOG.info("Registering mbean " + on + "...");
+                mbs.registerMBean(configMbean, on);
+            }
+        } catch(Exception e){
+            LOG.log(Level.WARNING,
+                    "Failed to register ConfigDocumentationMBean.", e);
+        }
+    }
+
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/ModelTarget.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/ModelTarget.java b/validation/src/main/java/org/apache/tamaya/validation/ModelTarget.java
new file mode 100644
index 0000000..e087c66
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/ModelTarget.java
@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation;
+
+/**
+ * This enumeration defines the types of supported validations.
+ */
+public enum ModelTarget {
+    /**
+     * A configuration section.
+     */
+    Section,
+    /**
+     * A configuration paramter.
+     */
+    Parameter,
+    /**
+     * ConfigModel that is a container of other validations.
+     */
+    Group,
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/Validation.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/Validation.java b/validation/src/main/java/org/apache/tamaya/validation/Validation.java
new file mode 100644
index 0000000..81a0118
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/Validation.java
@@ -0,0 +1,203 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation;
+
+import org.apache.tamaya.Configuration;
+import org.apache.tamaya.validation.spi.AbstractConfigModel;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Objects;
+
+/**
+ * Models a partial configuration configModel result.
+ */
+public final class Validation {
+    /**
+     * the config section.
+     */
+    private final ConfigModel configModel;
+    /**
+     * The configModel result.
+     */
+    private final ValidationResult result;
+    /**
+     * The configModel message.
+     */
+    private final String message;
+
+    /**
+     * Creates a new ValidationResult.
+     *
+     * @param configModel the configModel item, not null.
+     * @return a new validation result containing valid parts of the given model.
+     */
+    public static Validation ofValid(ConfigModel configModel) {
+        return new Validation(configModel, ValidationResult.VALID, null);
+    }
+
+    /**
+     * Creates a new ValidationResult.
+     *
+     * @param configModel the configModel item, not null.
+     * @return a new validation result containing missing parts of the given model.
+     */
+    public static Validation ofMissing(ConfigModel configModel) {
+        return new Validation(configModel, ValidationResult.MISSING, null);
+    }
+
+    /**
+     * Creates a new ValidationResult.
+     *
+     * @param configModel the configModel item, not null.
+     * @param message Additional message to be shown (optional).
+     * @return a new validation result containing missing parts of the given model with a message.
+     */
+    public static Validation ofMissing(ConfigModel configModel, String message) {
+        return new Validation(configModel, ValidationResult.MISSING, message);
+    }
+
+    /**
+     * Creates a new ValidationResult.
+     *
+     * @param configModel the configModel item, not null.
+     * @param error error message to add.
+     * @return a new validation result containing erroneous parts of the given model with the given error message.
+     */
+    public static Validation ofError(ConfigModel configModel, String error) {
+        return new Validation(configModel, ValidationResult.ERROR, error);
+    }
+
+    /**
+     * Creates a new ValidationResult.
+     *
+     * @param configModel the configModel item, not null.
+     * @param warning warning message to add.
+     * @return a new validation result containing warning parts of the given model with the given warning message.
+     */
+    public static Validation ofWarning(ConfigModel configModel, String warning) {
+        return new Validation(configModel, ValidationResult.WARNING, warning);
+    }
+
+    /**
+     * Creates a new ValidationResult.
+     *
+     * @param configModel the configModel item, not null.
+     * @param alternativeUsage allows setting a message to indicate non-deprecated replacement, maybe null.
+     * @return a new validation result containing deprecated parts of the given model with an optional message.
+     */
+    public static Validation ofDeprecated(ConfigModel configModel, String alternativeUsage) {
+        return new Validation(configModel, ValidationResult.DEPRECATED, alternativeUsage != null ? "Use instead: " + alternativeUsage : null);
+    }
+
+    /**
+     * Creates a new ValidationResult.
+     *
+     * @param configModel the configModel item, not null.
+     * @return a new validation result containing deprecated parts of the given model.
+     */
+    public static Validation ofDeprecated(ConfigModel configModel) {
+        return new Validation(configModel, ValidationResult.DEPRECATED, null);
+    }
+
+    /**
+     * Creates a new ValidationResult.
+     *
+     * @param owner owner
+     * @param key the name/model key
+     * @param type model type 
+     * @return a corresponding configModel item
+     */
+    public static Validation ofUndefined(final String owner, final String key, final ModelTarget type) {
+        return new Validation(new AbstractConfigModel(owner, key, false, "Undefined key: " + key) {
+
+            @Override
+            public ModelTarget getType() {
+                return type;
+            }
+
+            @Override
+            public Collection<Validation> validate(Configuration config) {
+                return Collections.emptyList();
+            }
+        }, ValidationResult.UNDEFINED, null);
+    }
+
+
+    /**
+     * Constructor.
+     *
+     * @param configModel the configModel item, not null.
+     * @param result     the configModel result, not null.
+     * @param message    the detail message.
+     * @return new validation result.
+     */
+    public static Validation of(ConfigModel configModel, ValidationResult result, String message) {
+        return new Validation(configModel, result, message);
+    }
+
+
+    /**
+     * Constructor.
+     *
+     * @param configModel the configModel item, not null.
+     * @param result     the configModel result, not null.
+     * @param message    the detail message.
+     */
+    private Validation(ConfigModel configModel, ValidationResult result, String message) {
+        this.message = message;
+        this.configModel = Objects.requireNonNull(configModel);
+        this.result = Objects.requireNonNull(result);
+    }
+
+    /**
+     * Get the configModel section.
+     *
+     * @return the section, never null.
+     */
+    public ConfigModel getConfigModel() {
+        return configModel;
+    }
+
+    /**
+     * Get the configModel result.
+     *
+     * @return the result, never null.
+     */
+    public ValidationResult getResult() {
+        return result;
+    }
+
+    /**
+     * Get the detail message.
+     *
+     * @return the detail message, or null.
+     */
+    public String getMessage() {
+        return message;
+    }
+
+    @Override
+    public String toString() {
+        if (message != null) {
+            return result + ": " + configModel.getName() + " (" + configModel.getType() + ") -> " + message + '\n';
+        }
+        return result + ": " + configModel.getName() + " (" + configModel.getType() + ")";
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/ValidationResult.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/ValidationResult.java b/validation/src/main/java/org/apache/tamaya/validation/ValidationResult.java
new file mode 100644
index 0000000..f368985
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/ValidationResult.java
@@ -0,0 +1,59 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation;
+
+/**
+ * Enum type describing the different validation results supported.
+ */
+public enum ValidationResult {
+    /**
+     * The validated item is valid
+     */
+    VALID,
+    /**
+     * The validated item is deprecated.
+     */
+    DEPRECATED,
+    /**
+     * The validated item is correct, but the value is worth a warning.
+     */
+    WARNING,
+    /**
+     * The given section or parameter is not a defined/validated item. It may be still valid, but typically,
+     * when validation is fully implemented, such a parameter or section should be removed.
+     */
+    UNDEFINED,
+    /**
+     * A required parameter or section is missing.
+     */
+    MISSING,
+    /**
+     * The validated item has an invalid value.
+     */
+    ERROR;
+
+    /**
+     * Method to quickly evaluate if the current state is an error state.
+     *
+     * @return true, if the state is not ERROR or MISSING.
+     */
+    boolean isError() {
+        return this.ordinal() == MISSING.ordinal() || this.ordinal() == ERROR.ordinal();
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/internal/ConfigDocumentationBean.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/internal/ConfigDocumentationBean.java b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfigDocumentationBean.java
new file mode 100644
index 0000000..59c5c22
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfigDocumentationBean.java
@@ -0,0 +1,197 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.internal;
+
+import org.apache.tamaya.Configuration;
+import org.apache.tamaya.ConfigurationProvider;
+import org.apache.tamaya.validation.ConfigModel;
+import org.apache.tamaya.validation.ConfigModelManager;
+import org.apache.tamaya.validation.ModelTarget;
+import org.apache.tamaya.validation.Validation;
+import org.apache.tamaya.validation.spi.ConfigDocumentationMBean;
+
+import javax.json.Json;
+import javax.json.JsonArray;
+import javax.json.JsonArrayBuilder;
+import javax.json.JsonObject;
+import javax.json.JsonObjectBuilder;
+import javax.json.JsonWriter;
+import javax.json.JsonWriterFactory;
+import javax.json.stream.JsonGenerator;
+import java.io.StringWriter;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * MBean implementation of {@link ConfigDocumentationMBean}.
+ */
+public class ConfigDocumentationBean implements ConfigDocumentationMBean{
+
+    private final JsonWriterFactory writerFactory;
+
+    private static final Comparator<Validation> COMPARATOR = new Comparator<Validation>() {
+        @Override
+        public int compare(Validation v1, Validation v2) {
+            int compare = VAL_COMPARATOR.compare(v1.getConfigModel(), v2.getConfigModel());
+            if(compare==0){
+                compare = v1.getResult().compareTo(v2.getResult());
+            }
+            if(compare==0){
+                return v1.getMessage().compareTo(v2.getMessage());
+            }
+            return compare;
+        }
+    };
+    private static final Comparator<ConfigModel> VAL_COMPARATOR = new Comparator<ConfigModel>() {
+        @Override
+        public int compare(ConfigModel v1, ConfigModel v2) {
+            int compare = v1.getType().compareTo(v2.getType());
+            if(compare==0){
+                compare = v1.getName().compareTo(v2.getName());
+            }
+            return compare;
+        }
+    };
+
+    private Configuration config;
+
+    /**
+     * Default constructor, using the current configuration being available.
+     */
+    public ConfigDocumentationBean(){
+        this(null);
+    }
+
+
+    /**
+     * Creates an mbean bound to the given configuration. This is useful, when multiple mbeans for each
+     * context should be used, e.g. one mbean per ear, app deployment.
+     * @param config the configuration to be used.
+     */
+    public ConfigDocumentationBean(Configuration config){
+        this.config = config;
+        Map<String, Object> writerProperties = new HashMap<>(1);
+        writerProperties.put(JsonGenerator.PRETTY_PRINTING, true);
+        writerFactory = Json.createWriterFactory(writerProperties);
+    }
+
+    /**
+     * Access the configuration.
+     * @return either the configuration bound to this bean, or the current configuration.
+     */
+    private Configuration getConfig(){
+        return config!=null?config: ConfigurationProvider.getConfiguration();
+    }
+
+    @Override
+    public String validate(boolean showUndefined) {
+        List<Validation> validations = new ArrayList<>(ConfigModelManager.validate(getConfig(), showUndefined));
+        Collections.sort(validations, COMPARATOR);
+        JsonArrayBuilder builder = Json.createArrayBuilder();
+        for(Validation val:validations){
+            builder.add(toJsonObject(val));
+        }
+        return formatJson(builder.build());
+    }
+
+
+
+    @Override
+    public String getConfigurationModel() {
+        List<ConfigModel> configModels = new ArrayList<>(ConfigModelManager.getModels());
+        Collections.sort(configModels, VAL_COMPARATOR);
+        JsonArrayBuilder result = Json.createArrayBuilder();
+        for(ConfigModel val: configModels){
+            result.add(toJsonObject(val));
+        }
+        return formatJson(result.build());
+    }
+
+    @Override
+    public String getConfigurationModel(ModelTarget type) {
+        return findValidationModels(".*", type);
+    }
+
+    @Override
+    public String findConfigurationModels(String namePattern) {
+        List<ConfigModel> configModels = new ArrayList<>(ConfigModelManager.findModels(namePattern));
+        Collections.sort(configModels, VAL_COMPARATOR);
+        JsonArrayBuilder result = Json.createArrayBuilder();
+        for(ConfigModel val: configModels){
+            result.add(toJsonObject(val));
+        }
+        return formatJson(result.build());
+    }
+
+    @Override
+    public String findValidationModels(String namePattern, ModelTarget... type) {
+        List<ConfigModel> configModels = new ArrayList<>(ConfigModelManager.findModels(namePattern, type));
+        Collections.sort(configModels, VAL_COMPARATOR);
+        JsonArrayBuilder result = Json.createArrayBuilder();
+        for(ConfigModel val: configModels){
+            result.add(toJsonObject(val));
+        }
+        return formatJson(result.build());
+    }
+
+    @Override
+    public String toString(){
+        return "ConfigDocumentationBean, config: " + (this.config!=null?this.config.toString():"<current>");
+    }
+
+
+    private JsonObject toJsonObject(ConfigModel val) {
+        JsonObjectBuilder valJson = Json.createObjectBuilder().add("target", val.getType().toString())
+                .add("name", val.getName());
+        if(val.getDescription()!=null) {
+            valJson.add("description", val.getDescription());
+        }
+        if(val.isRequired()){
+            valJson.add("required",true);
+        }
+        return valJson.build();
+    }
+
+    private JsonObject toJsonObject(Validation val) {
+        JsonObjectBuilder valJson = Json.createObjectBuilder().add("target", val.getConfigModel().getType().toString())
+                .add("name", val.getConfigModel().getName());
+        if(val.getConfigModel().isRequired()){
+            valJson.add("required",true);
+        }
+        if(val.getConfigModel().getDescription() != null){
+            valJson.add("description", val.getConfigModel().getDescription());
+        }
+        valJson.add("result", val.getResult().toString());
+        if( val.getMessage() != null) {
+            valJson.add("message", val.getMessage());
+        }
+        return valJson.build();
+    }
+
+    private String formatJson(JsonArray data) {
+        StringWriter writer = new StringWriter();
+        JsonWriter gen = writerFactory.createWriter(writer);
+        gen.writeArray(data);
+        return writer.toString();
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredInlineModelProviderSpi.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredInlineModelProviderSpi.java b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredInlineModelProviderSpi.java
new file mode 100644
index 0000000..6658bb5
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredInlineModelProviderSpi.java
@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.internal;
+
+import org.apache.tamaya.ConfigurationProvider;
+import org.apache.tamaya.validation.ConfigModel;
+import org.apache.tamaya.validation.spi.ConfigModelReader;
+import org.apache.tamaya.validation.spi.ModelProviderSpi;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+import java.util.logging.Logger;
+
+/**
+ * ConfigModel provider that reads model metadata from the current {@link org.apache.tamaya.Configuration}.
+ */
+public class ConfiguredInlineModelProviderSpi implements ModelProviderSpi {
+
+    /** The logger. */
+    private static final Logger LOG = Logger.getLogger(ConfiguredInlineModelProviderSpi.class.getName());
+    /** parameter to disable this provider. By default the provider is active. */
+    private static final String MODEL_EANABLED_PARAM = "org.apache.tamaya.model.integrated.enabled";
+
+    /** The configModels read. */
+    private List<ConfigModel> configModels = new ArrayList<>();
+
+
+    /**
+     * Constructor, typically called by the {@link java.util.ServiceLoader}.
+     */
+    public ConfiguredInlineModelProviderSpi() {
+        String enabledVal = ConfigurationProvider.getConfiguration().get(MODEL_EANABLED_PARAM);
+        boolean enabled = enabledVal == null || "true".equalsIgnoreCase(enabledVal);
+        if (enabled) {
+            LOG.info("Reading model configuration from config...");
+            Map<String,String> config = ConfigurationProvider.getConfiguration().getProperties();
+            String owner = config.get("_model.provider");
+            if(owner==null){
+                owner = config.toString();
+            }
+            configModels.addAll(ConfigModelReader.loadValidations(owner, config));
+        }
+        configModels = Collections.unmodifiableList(configModels);
+    }
+
+
+    public Collection<ConfigModel> getConfigModels() {
+        return configModels;
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredPropertiesModelProviderSpi.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredPropertiesModelProviderSpi.java b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredPropertiesModelProviderSpi.java
new file mode 100644
index 0000000..97e23c6
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredPropertiesModelProviderSpi.java
@@ -0,0 +1,154 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.internal;
+
+import org.apache.tamaya.ConfigurationProvider;
+import org.apache.tamaya.validation.ConfigModel;
+import org.apache.tamaya.validation.spi.ConfigModelReader;
+import org.apache.tamaya.validation.spi.ModelProviderSpi;
+import org.apache.tamaya.spisupport.MapPropertySource;
+
+import java.io.InputStream;
+import java.net.URL;
+import java.util.*;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * ConfigModel provider that reads model metadata from property files from
+ * {@code classpath*:META-INF/configmodel.properties} in the following format:
+ * <pre>
+ * ###################################################################################
+ * # Example of a configuration metamodel expressed via properties.
+ * ####################################################################################
+ *
+ * # Metamodel information
+ * [model].provider=ConfigModel Extension
+ *
+ * ####################################################################################
+ * # Description of Configuration Sections (minimal, can be extended by other modules).
+ * # By default its interpreted as a section !
+ * ####################################################################################
+ *
+ * # a (section)
+ * {model}a.class=Section
+ * {model}a.params2.class=Parameter
+ * {model}a.params2.type=String
+ * {model}a.params2.required=true
+ * {model}a.params2.description=a required parameter
+ *
+ * {model}a.paramInt.class=Parameter
+ * {model}a.paramInt.ref=MyNumber
+ * {model}a.paramInt.description=an optional parameter (default)
+ *
+ * {model}a._number.class=Parameter
+ * {model}a._number.type=Integer
+ * {model}a._number.deprecated=true
+ * {model}a._number.mappedTo=a.paramInt
+ *
+ * # a.b.c (section)
+ * {model}a.b.c.class=Section
+ * {model}a.b.c.description=Just a test section
+ *
+ * # a.b.c.aRequiredSection (section)
+ * {model}a.b.c.aRequiredSection.class=Section
+ * {model}a.b.c.aRequiredSection.required=true
+ * {model}a.b.c.aRequiredSection.description=A section containing required parameters is called a required section.\
+ * Sections can also explicitly be defined to be required, but without\
+ * specifying the paramteres to be contained.,
+ *
+ * # a.b.c.aRequiredSection.subsection (section)
+ * {model}a.b.c.aRequiredSection.subsection.class=Section
+ *
+ * {model}a.b.c.aRequiredSection.subsection.param0.class=Parameter
+ * {model}a.b.c.aRequiredSection.subsection.param0.type=String
+ * {model}a.b.c.aRequiredSection.subsection.param0.description=a minmally documented String parameter
+ * # A minmal String parameter
+ * {model}a.b.c.aRequiredSection.subsection.param00.class=Parameter
+ * {model}a.b.c.aRequiredSection.subsection.param00.type=String
+ *
+ * # a.b.c.aRequiredSection.subsection (section)
+ * {model}a.b.c.aRequiredSection.subsection.param1.class=Parameter
+ * {model}a.b.c.aRequiredSection.subsection.param1.type = String
+ * {model}a.b.c.aRequiredSection.subsection.param1.required = true
+ * {model}a.b.c.aRequiredSection.subsection.intParam.class=Parameter
+ * {model}a.b.c.aRequiredSection.subsection.intParam.type = Integer
+ * {model}a.b.c.aRequiredSection.subsection.intParam.description=an optional parameter (default)
+ *
+ * # a.b.c.aRequiredSection.nonempty-subsection (section)
+ * {model}a.b.c.aRequiredSection.nonempty-subsection.class=Section
+ * {model}a.b.c.aRequiredSection.nonempty-subsection.required=true
+ *
+ * # a.b.c.aRequiredSection.optional-subsection (section)
+ * {model}a.b.c.aRequiredSection.optional-subsection.class=Section
+ *
+ * # a.b.c.aValidatedSection (section)
+ * {model}a.b.c.aValidatedSection.class=Section
+ * {model}a.b.c.aValidatedSection.description=A validated section.
+ * {model}a.b.c.aValidatedSection.configModels=org.apache.tamaya.model.TestValidator
+ * </pre>
+ */
+public class ConfiguredPropertiesModelProviderSpi implements ModelProviderSpi {
+
+    /** The logger. */
+    private static final Logger LOG = Logger.getLogger(ConfiguredPropertiesModelProviderSpi.class.getName());
+    /** parameter to disable this provider. By default the provider is active. */
+    private static final String MODEL_EANABLED_PARAM = "org.apache.tamaya.model.default.enabled";
+    /** The configModels read. */
+    private List<ConfigModel> configModels = new ArrayList<>();
+
+    public ConfiguredPropertiesModelProviderSpi() {
+        String enabledVal = ConfigurationProvider.getConfiguration().get(MODEL_EANABLED_PARAM);
+        boolean enabled = enabledVal == null || "true".equalsIgnoreCase(enabledVal);
+        if(!enabled){
+            LOG.info("Reading model data from META-INF/configmodel.properties has been disabled.");
+            return;
+        }
+        try {
+            LOG.info("Reading model data from META-INF/configmodel.properties...");
+            Enumeration<URL> configs = getClass().getClassLoader().getResources("META-INF/configmodel.properties");
+            while (configs.hasMoreElements()) {
+                URL config = configs.nextElement();
+                try (InputStream is = config.openStream()) {
+                    Properties props = new Properties();
+                    props.load(is);
+                    Map<String,String> data = MapPropertySource.getMap(props);
+                    String owner = data.get("_model.owner");
+                    if(owner==null){
+                        owner = config.toString();
+                    }
+                    configModels.addAll(ConfigModelReader.loadValidations(owner,
+                            data));
+                } catch (Exception e) {
+                    Logger.getLogger(getClass().getName()).log(Level.SEVERE,
+                            "Error loading config metadata from " + config, e);
+                }
+            }
+        } catch (Exception e) {
+            LOG.log(Level.SEVERE,
+                    "Error loading config metadata from META-INF/configmodel.properties", e);
+        }
+        configModels = Collections.unmodifiableList(configModels);
+    }
+
+
+    public Collection<ConfigModel> getConfigModels() {
+        return configModels;
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredResourcesModelProviderSpi.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredResourcesModelProviderSpi.java b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredResourcesModelProviderSpi.java
new file mode 100644
index 0000000..1894570
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredResourcesModelProviderSpi.java
@@ -0,0 +1,160 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.internal;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.*;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import org.apache.tamaya.ConfigurationProvider;
+import org.apache.tamaya.format.ConfigurationData;
+import org.apache.tamaya.format.ConfigurationFormats;
+import org.apache.tamaya.validation.ConfigModel;
+import org.apache.tamaya.validation.spi.ConfigModelReader;
+import org.apache.tamaya.validation.spi.ModelProviderSpi;
+import org.apache.tamaya.resource.ConfigResources;
+
+/**
+ * ConfigModel provider that reads model metadata from property files from
+ * {@code classpath*:META-INF/configmodel.json} in the following format:
+ * <pre>
+ *  Example of a configuration metamodel expressed via YAML.
+ *  Structure is shown through indentation (one or more spaces).
+ *  Sequence items are denoted by a dash,
+ *  key value pairs within a map are separated by a colon.
+ * </pre>
+ */
+public class ConfiguredResourcesModelProviderSpi implements ModelProviderSpi {
+
+    /**
+     * The logger.
+     */
+    private static final Logger LOG = Logger.getLogger(ConfiguredResourcesModelProviderSpi.class.getName());
+    /**
+     * The parameter that can be used to configure the location of the configuration model resources.
+     */
+    private static final String MODEL_RESOURCE_PARAM = "org.apache.tamaya.model.resources";
+    /**
+     * The resource class to checked for testing the availability of the resources extension module.
+     */
+    private static final String CONFIG_RESOURCE_CLASS = "org.apache.tamaya.resource.ConfigResource";
+    /**
+     * The resource class to checked for testing the availability of the formats extension module.
+     */
+    private static final String CONFIGURATION_FORMATS_CLASS = "org.apache.tamaya.format.ConfigurationFormats";
+    /**
+     * Initializes the flag showing if the formats module is present (required).
+     */
+    private static final boolean AVAILABLE = checkAvailabilityFormats();
+    /**
+     * Initializes the flag showing if the resources module is present (optional).
+     */
+    private static final boolean RESOURCES_EXTENSION_AVAILABLE = checkAvailabilityResources();
+
+    /**
+     * The configModels read.
+     */
+    private List<ConfigModel> configModels = new ArrayList<>();
+
+    /**
+     * Initializes the flag showing if the formats module is present (required).
+     */
+    private static boolean checkAvailabilityFormats() {
+        try {
+            Class.forName(CONFIGURATION_FORMATS_CLASS);
+            return true;
+        } catch (final Exception e) {
+            return false;
+        }
+    }
+
+    /**
+     * Initializes the flag showing if the resources module is present (optional).
+     */
+    private static boolean checkAvailabilityResources() {
+        try {
+            Class.forName(CONFIG_RESOURCE_CLASS);
+            return true;
+        } catch (final Exception e) {
+            return false;
+        }
+    }
+
+    /**
+     * Constructor, mostly called from {@link java.util.ServiceLoader}
+     */
+    public ConfiguredResourcesModelProviderSpi() {
+        if (!AVAILABLE) {
+            LOG.info("tamaya-format extension is required to read model configuration, No extended model support AVAILABLE.");
+        } else {
+            final String resources = ConfigurationProvider.getConfiguration().get(MODEL_RESOURCE_PARAM);
+            if (resources == null || resources.trim().isEmpty()) {
+                LOG.info("Mo model resources location configured in " + MODEL_RESOURCE_PARAM + ".");
+                return;
+            }
+            Collection<URL> urls;
+            if (RESOURCES_EXTENSION_AVAILABLE) {
+                LOG.info("Using tamaya-resources extension to read model configuration from " + resources);
+                urls = ConfigResources.getResourceResolver().getResources(resources.split(","));
+            } else {
+                LOG.info("Using default classloader resource location to read model configuration from " + resources);
+                urls = new ArrayList<>();
+                for (final String resource : resources.split(",")) {
+                    if (!resource.trim().isEmpty()) {
+                        Enumeration<URL> configs;
+                        try {
+                            configs = getClass().getClassLoader().getResources(resource);
+                            while (configs.hasMoreElements()) {
+                                urls.add(configs.nextElement());
+                            }
+                        } catch (final IOException e) {
+                            Logger.getLogger(getClass().getName()).log(Level.SEVERE,
+                                    "Error evaluating config model locations from " + resource, e);
+                        }
+                    }
+                }
+            }
+            // Reading configs
+            for (final URL config : urls) {
+                try (InputStream is = config.openStream()) {
+                    final ConfigurationData data = ConfigurationFormats.readConfigurationData(config);
+                    Map<String,String> props = data.getCombinedProperties();
+                    String owner = props.get("_model.provider");
+                    if(owner==null){
+                        owner = config.toString();
+                    }
+                    configModels.addAll(ConfigModelReader.loadValidations(owner, props));
+                } catch (final Exception e) {
+                    Logger.getLogger(getClass().getName()).log(Level.SEVERE,
+                            "Error loading config model data from " + config, e);
+                }
+            }
+        }
+        configModels = Collections.unmodifiableList(configModels);
+    }
+
+
+    @Override
+    public Collection<ConfigModel> getConfigModels() {
+        return configModels;
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredTypeEventsModelPopulator.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredTypeEventsModelPopulator.java b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredTypeEventsModelPopulator.java
new file mode 100644
index 0000000..78564c3
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredTypeEventsModelPopulator.java
@@ -0,0 +1,90 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.internal;
+
+import org.apache.tamaya.events.ConfigEvent;
+import org.apache.tamaya.events.ConfigEventListener;
+import org.apache.tamaya.inject.spi.ConfiguredField;
+import org.apache.tamaya.inject.spi.ConfiguredMethod;
+import org.apache.tamaya.inject.spi.ConfiguredType;
+import org.apache.tamaya.validation.ConfigModelManager;
+import org.apache.tamaya.validation.spi.ParameterModel;
+
+import java.util.Collection;
+import java.util.logging.Logger;
+
+/**
+ * Internal facade that registers all kind of injected fields as {@link org.apache.tamaya.model.ConfigModel} entries,
+ * so all configured injection points are visible as documented configuration hooks.
+ */
+public final class ConfiguredTypeEventsModelPopulator implements ConfigEventListener {
+
+    /**
+     * The logger.
+     */
+    private static final Logger LOG = Logger.getLogger(ConfiguredTypeEventsModelPopulator.class.getName());
+
+    /** System property to be set to deactivate auto documentation of configured classes published thorugh
+     * ConfiguredType events.
+     */
+    private static final String ENABLE_EVENT_DOC = "org.apache.tamaya.model.autoModelEvents";
+
+    @Override
+    public void onConfigEvent(ConfigEvent event) {
+        if(event.getResourceType()!=ConfiguredType.class){
+            return;
+        }
+        String value = System.getProperty(ENABLE_EVENT_DOC);
+        if(value == null || Boolean.parseBoolean(value)) {
+            ConfiguredType confType = (ConfiguredType)event.getResource();
+            for (ConfiguredField field : confType.getConfiguredFields()) {
+                Collection<String> keys = field.getConfiguredKeys();
+                for (String key : keys) {
+                    ParameterModel val = ConfigModelManager.getModel(key, ParameterModel.class);
+                    if (val == null) {
+                        ConfiguredTypeEventsModelProvider.addConfigModel(
+                                new ParameterModel.Builder(confType.getName(), key)
+                                .setType(field.getType().getName())
+                                .setDescription("Injected field: " +
+                                        field.getAnnotatedField().getDeclaringClass().getName() + '.' + field.toString() +
+                                        ", \nconfigured with keys: " + keys)
+                                .build());
+                    }
+                }
+            }
+            for (ConfiguredMethod method : confType.getConfiguredMethods()) {
+                Collection<String> keys = method.getConfiguredKeys();
+                for (String key : keys) {
+                    ParameterModel val = ConfigModelManager.getModel(key, ParameterModel.class);
+                    if (val == null) {
+                        ConfiguredTypeEventsModelProvider.addConfigModel(
+                                new ParameterModel.Builder(confType.getName(), key)
+                                .setType(method.getParameterTypes()[0].getName())
+                                .setDescription("Injected field: " +
+                                        method.getAnnotatedMethod().getDeclaringClass().getName() + '.' + method.toString() +
+                                        ", \nconfigured with keys: " + keys)
+                                .build());
+                    }
+                }
+            }
+        }
+    }
+
+
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredTypeEventsModelProvider.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredTypeEventsModelProvider.java b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredTypeEventsModelProvider.java
new file mode 100644
index 0000000..82bd925
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/internal/ConfiguredTypeEventsModelProvider.java
@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.internal;
+
+import org.apache.tamaya.validation.ConfigModel;
+import org.apache.tamaya.validation.spi.ModelProviderSpi;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Model provider that adds model definitions for the items published as
+ * {@link org.apache.tamaya.inject.spi.ConfiguredType} events.
+ */
+public class ConfiguredTypeEventsModelProvider implements ModelProviderSpi {
+    /** The collected models. */
+    private static Collection<ConfigModel> configModels = new ArrayList<>();
+
+    /**
+     * Adds a model, called from the registered listener class.
+     * @param configModel adds the config model.
+     */
+    static void addConfigModel(ConfigModel configModel){
+        List<ConfigModel> newList = new ArrayList<>(configModels);
+        newList.add(configModel);
+        ConfiguredTypeEventsModelProvider.configModels = newList;
+    }
+
+    @Override
+    public Collection<ConfigModel> getConfigModels() {
+        return Collections.unmodifiableCollection(configModels);
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/spi/AbstractConfigModel.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/spi/AbstractConfigModel.java b/validation/src/main/java/org/apache/tamaya/validation/spi/AbstractConfigModel.java
new file mode 100644
index 0000000..31c2395
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/spi/AbstractConfigModel.java
@@ -0,0 +1,88 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.spi;
+
+import org.apache.tamaya.validation.ConfigModel;
+
+import java.util.Objects;
+
+/**
+ * Default configuration Model for a configuration area.
+ */
+public abstract class AbstractConfigModel implements ConfigModel, Comparable<ConfigModel> {
+    private final String owner;
+    private final String name;
+    private final String description;
+    private boolean required = false;
+
+
+    protected AbstractConfigModel(String owner, String name, boolean required, String description) {
+        this.name = Objects.requireNonNull(name);
+        this.owner = Objects.requireNonNull(owner);
+        this.description = description;
+        this.required = required;
+    }
+
+    @Override
+    public String getOwner() {
+        return owner;
+    }
+
+    @Override
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public String getDescription() {
+        return description;
+    }
+
+    @Override
+    public boolean isRequired() {
+        return required;
+    }
+
+    @Override
+    public int compareTo(ConfigModel configModel) {
+        int compare = getType().compareTo(configModel.getType());
+        if (compare != 0) {
+            return compare;
+        }
+        return getName().compareTo(configModel.getName());
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (o == null || getClass() != o.getClass()) {
+            return false;
+        }
+        AbstractConfigModel that = (AbstractConfigModel) o;
+        return getType().equals(that.getType()) && name.equals(that.name);
+
+    }
+
+    @Override
+    public int hashCode() {
+        return getType().hashCode() + name.hashCode();
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/spi/ConfigDocumentationMBean.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/spi/ConfigDocumentationMBean.java b/validation/src/main/java/org/apache/tamaya/validation/spi/ConfigDocumentationMBean.java
new file mode 100644
index 0000000..dbacaa2
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/spi/ConfigDocumentationMBean.java
@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.spi;
+
+import org.apache.tamaya.validation.ModelTarget;
+
+/**
+ * JMX Management bean for accessing current configuration information
+ */
+public interface ConfigDocumentationMBean {
+    /**
+     * Validates the configuration for the given context.
+     *
+     * @param showUndefined allows filtering for undefined configuration elements.
+     * @return the validation results, never null.
+     */
+    String validate(boolean showUndefined);
+
+    String getConfigurationModel();
+
+    String getConfigurationModel(ModelTarget type);
+
+    /**
+     * Find the validations by checking the validation's name using the given regular expression.
+     * @param namePattern the regular expression to use, not null.
+     * @return the sections defined, never null.
+     */
+    String findConfigurationModels(String namePattern);
+
+    /**
+     * Find the validations by checking the validation's name using the given regular expression.
+     * @param type the target ModelTypes (optional), not null.
+     * @param namePattern the regular expression to use, not null.
+     * @return the sections defined, never null.
+     */
+    String findValidationModels(String namePattern, ModelTarget... type);
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/spi/ConfigModelReader.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/spi/ConfigModelReader.java b/validation/src/main/java/org/apache/tamaya/validation/spi/ConfigModelReader.java
new file mode 100644
index 0000000..a9c23eb
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/spi/ConfigModelReader.java
@@ -0,0 +1,144 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.spi;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.apache.tamaya.validation.ConfigModel;
+
+/**
+ * Utility class to read metamodel information from properties. Hereby these properties can be part of a
+ * configuration (containing other entriees as well) or be dedicated model definition properties read
+ * from any kind of source.
+ */
+public final class ConfigModelReader {
+
+    /** The default model entries selector. */
+    private static final String DEFAULT_META_INFO_SELECTOR = ".model";
+    /** parameter to change the selector to be used for filtering out the target values to be used. */
+    private static final String META_INFO_SELECTOR_PARAM = "org.apache.tamaya.model.integrated.selector";
+
+    /**
+     * Utility class only.
+     */
+    private ConfigModelReader(){}
+
+
+    /**
+     * Loads validations as configured in the given properties.
+     * @param owner owner, not null.
+     * @param props the properties to be read
+     * @return a collection of config validations.
+     */
+    public static Collection<ConfigModel> loadValidations(String owner, Map<String,String> props) {
+        List<ConfigModel> result = new ArrayList<>();
+        Set<String> itemKeys = new HashSet<>();
+        for (Object key : props.keySet()) {
+            if (key.toString().startsWith("_") &&
+                    key.toString().endsWith(DEFAULT_META_INFO_SELECTOR + ".target")) {
+                itemKeys.add(key.toString().substring(0, key.toString().length() - ".model.target".length()));
+            }
+        }
+        for (String baseKey : itemKeys) {
+            String target = props.get(baseKey + ".model.target");
+            String type = props.get(baseKey + ".model.type");
+            if (type == null) {
+                type = String.class.getName();
+            }
+            String value = props.get(baseKey + ".model.transitive");
+            boolean transitive = false;
+            if(value!=null) {
+                transitive = Boolean.parseBoolean(value);
+            }
+            String description = props.get(baseKey + ".model.description");
+            String regEx = props.get(baseKey + ".model.expression");
+            String validations = props.get(baseKey + ".model.validations");
+            String requiredVal = props.get(baseKey + ".model.required");
+            String targetKey = baseKey.substring(1);
+            if ("Parameter".equalsIgnoreCase(target)) {
+                result.add(createParameterValidation(owner, targetKey,
+                        description, type, requiredVal, regEx, validations));
+            } else if ("Section".equalsIgnoreCase(target)) {
+                if(transitive){
+                    result.add(createSectionValidation(owner, targetKey+".*",
+                            description, requiredVal, validations));
+                } else {
+                    result.add(createSectionValidation(owner, targetKey,
+                            description, requiredVal, validations));
+                }
+            }
+        }
+        return result;
+    }
+
+    /**
+     * Creates a parameter validation.
+     * @param paramName the param name, not null.
+     * @param description the optional description
+     * @param type the param type, default is String.
+     * @param reqVal the required value, default is 'false'.
+     * @param regEx an optional regular expression to be checked for this param
+     * @param validations the optional custom validations to be performed.
+     * @return the new validation for this parameter.
+     */
+    private static ConfigModel createParameterValidation(String owner, String paramName, String description, String type, String reqVal,
+                                                         String regEx, String validations) {
+        boolean required = "true".equalsIgnoreCase(reqVal);
+        ParameterModel.Builder builder = ParameterModel.builder(owner, paramName).setRequired(required)
+                .setDescription(description).setExpression(regEx).setType(type);
+//        if (validations != null) {
+//            try {
+//                // TODO define validator API
+////                builder.addValidations(loadValidations(validations));
+//            } catch (Exception e) {
+//                LOGGER.log(Level.WARNING, "Failed to load validations for " + paramName, e);
+//            }
+//        }
+       return builder.build();
+    }
+
+    /**
+     * Creates a section validation.
+     * @param sectionName the section's name, not null.
+     * @param description the optional description
+     * @param reqVal the required value, default is 'false'.
+     * @param validations the optional custom validations to be performed.
+     * @return the new validation for this section.
+     */
+    private static ConfigModel createSectionValidation(String owner, String sectionName, String description, String reqVal,
+                                                       String validations) {
+        boolean required = "true".equalsIgnoreCase(reqVal);
+        SectionModel.Builder builder = SectionModel.builder(owner, sectionName).setRequired(required)
+                .setDescription(description);
+//        if (validations != null) {
+//            try {
+//                // TODO define validator API
+////                builder.addValidations(loadValidations(valiadtions));
+//            } catch (Exception e) {
+//                LOGGER.log(Level.WARNING, "Failed to load validations for " + sectionName, e);
+//            }
+//        }
+        return builder.build();
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/spi/GroupModel.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/spi/GroupModel.java b/validation/src/main/java/org/apache/tamaya/validation/spi/GroupModel.java
new file mode 100644
index 0000000..7266db7
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/spi/GroupModel.java
@@ -0,0 +1,110 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.spi;
+
+import org.apache.tamaya.Configuration;
+import org.apache.tamaya.validation.ConfigModel;
+import org.apache.tamaya.validation.ModelTarget;
+import org.apache.tamaya.validation.Validation;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * Default configuration Model for a configuration area.
+ */
+public class GroupModel implements ConfigModel {
+
+    private final String owner;
+    private final String name;
+    private boolean required;
+    private List<ConfigModel> childModels = new ArrayList<>();
+
+    public GroupModel(String owner, String name, ConfigModel... configModels){
+        this(owner, name, Arrays.asList(configModels));
+    }
+
+    public GroupModel(String owner, String name, Collection<ConfigModel> configModels){
+        this.owner = Objects.requireNonNull(owner);
+        this.name = Objects.requireNonNull(name);
+        this.childModels.addAll(configModels);
+        this.childModels = Collections.unmodifiableList(childModels);
+        for(ConfigModel val: configModels) {
+            if(val.isRequired()){
+                this.required = true;
+                break;
+            }
+        }
+    }
+
+    @Override
+    public String getOwner() {
+        return owner;
+    }
+
+    @Override
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public boolean isRequired() {
+        return required;
+    }
+
+    @Override
+    public ModelTarget getType() {
+        return ModelTarget.Group;
+    }
+
+    @Override
+    public String getDescription() {
+        if(childModels.isEmpty()){
+            return null;
+        }
+        StringBuilder b = new StringBuilder();
+        for(ConfigModel val: childModels){
+            b.append("  >> ").append(val);
+        }
+        return b.toString();
+    }
+
+    public Collection<ConfigModel> getValidations(){
+        return childModels;
+    }
+
+    @Override
+    public Collection<Validation> validate(Configuration config) {
+        List<Validation> result = new ArrayList<>(1);
+        for(ConfigModel child: childModels){
+            result.addAll(child.validate(config));
+        }
+        return result;
+    }
+
+    @Override
+    public String toString(){
+        return String.valueOf(getType()) + ", size: " + childModels.size() + ": " + getDescription();
+    }
+
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/041f5998/validation/src/main/java/org/apache/tamaya/validation/spi/ModelProviderSpi.java
----------------------------------------------------------------------
diff --git a/validation/src/main/java/org/apache/tamaya/validation/spi/ModelProviderSpi.java b/validation/src/main/java/org/apache/tamaya/validation/spi/ModelProviderSpi.java
new file mode 100644
index 0000000..9e2a4d4
--- /dev/null
+++ b/validation/src/main/java/org/apache/tamaya/validation/spi/ModelProviderSpi.java
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.tamaya.validation.spi;
+
+import org.apache.tamaya.validation.ConfigModel;
+
+import java.util.Collection;
+
+/**
+ * Model of a configuration state. A model can be a full model, or a partial model, validating only
+ * a configuration subset. This allows better user feedback because big configurations can be grouped
+ * and validated by multiple (partial) models.
+ */
+public interface ModelProviderSpi {
+
+    /**
+     * Get the validation defined.
+     *
+     * @return the sections defined, never null.
+     */
+    Collection<ConfigModel> getConfigModels();
+
+}



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