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From ple...@apache.org
Subject [37/50] [abbrv] incubator-tamaya-sandbox git commit: Added Vaadin based UI module.
Date Tue, 06 Sep 2016 17:18:33 GMT
Added Vaadin based UI module.


Project: http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/repo
Commit: http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/commit/c4c3d9b2
Tree: http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/tree/c4c3d9b2
Diff: http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/diff/c4c3d9b2

Branch: refs/heads/master
Commit: c4c3d9b215f0afdb9987010e3a06443b56c8eb72
Parents: 80df0be
Author: anatole <anatole@apache.org>
Authored: Wed Mar 30 22:48:25 2016 +0200
Committer: anatole <anatole@apache.org>
Committed: Wed Mar 30 22:48:25 2016 +0200

----------------------------------------------------------------------
 ui/jsf/pom.xml                                  | 152 ------------
 ui/jsf/src/main/webapp/index.jsf                |  15 --
 ui/pom.xml                                      | 230 ++++++++++++++++++-
 .../org/apache/tamaya/ui/ApplicationLayout.java |  81 +++++++
 .../main/java/org/apache/tamaya/ui/Content.java |  34 +++
 .../java/org/apache/tamaya/ui/CurrentUser.java  |  23 ++
 .../main/java/org/apache/tamaya/ui/Header.java  |  44 ++++
 ui/src/main/java/org/apache/tamaya/ui/MyUI.java | 102 ++++++++
 .../main/java/org/apache/tamaya/ui/NavBar.java  |  73 ++++++
 .../java/org/apache/tamaya/ui/UIConstants.java  |  22 ++
 ui/src/main/java/org/apache/tamaya/ui/User.java |  34 +++
 .../org/apache/tamaya/ui/VaadinApplication.java |  93 ++++++++
 .../java/org/apache/tamaya/ui/VaadinBundle.java |  55 +++++
 .../java/org/apache/tamaya/ui/ViewConfig.java   |  20 ++
 .../tamaya/ui/components/LazyProvider.java      |  24 ++
 .../tamaya/ui/components/PageTitleUpdater.java  |  25 ++
 .../ui/components/VerticalSpacedLayout.java     |  14 ++
 .../org/apache/tamaya/ui/event/EventBus.java    |  34 +++
 .../org/apache/tamaya/ui/event/LogoutEvent.java |   4 +
 .../apache/tamaya/ui/event/NavigationEvent.java |  14 ++
 .../apache/tamaya/ui/services/LoginService.java |  12 +
 .../apache/tamaya/ui/views/ComponentView.java   | 128 +++++++++++
 .../org/apache/tamaya/ui/views/ConfigView.java  | 113 +++++++++
 .../org/apache/tamaya/ui/views/ErrorView.java   |  21 ++
 .../org/apache/tamaya/ui/views/HomeView.java    |  34 +++
 .../apache/tamaya/ui/views/login/LoginBox.java  |  88 +++++++
 .../tamaya/ui/views/login/LoginEvent.java       |  15 ++
 .../apache/tamaya/ui/views/login/LoginView.java |  13 ++
 ui/src/main/resources/config/application.yml    |   9 +
 ui/src/test/resources/config/application.yml    |  13 ++
 30 files changed, 1367 insertions(+), 172 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/jsf/pom.xml
----------------------------------------------------------------------
diff --git a/ui/jsf/pom.xml b/ui/jsf/pom.xml
deleted file mode 100644
index aab6a64..0000000
--- a/ui/jsf/pom.xml
+++ /dev/null
@@ -1,152 +0,0 @@
-<!-- 
-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.
--->
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-
-    <parent>
-        <groupId>org.apache.tamaya.ext</groupId>
-        <artifactId>tamaya-ui</artifactId>
-        <version>0.2-incubating-SNAPSHOT</version>
-    </parent>
-
-    <artifactId>tamaya-ui-jsf</artifactId>
-    <name>Apache Tamaya Modules UI - JSF</name>
-    <packaging>war</packaging>
-
-    <properties>
-        <jsf.version>4.2.1.RELEASE</jsf.version>
-        <primefaces.version>1.2.6.RELEASE</primefaces.version>
-    </properties>
-
-    <build>
-        <plugins>
-            <plugin>
-                <groupId>org.jacoco</groupId>
-                <artifactId>jacoco-maven-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <id>prepare-agent</id>
-                        <goals>
-                            <goal>prepare-agent</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.felix</groupId>
-                <artifactId>maven-bundle-plugin</artifactId>
-                <extensions>true</extensions>
-                <configuration>
-                    <instructions>
-                        <Export-Package>
-                            org.apache.tamaya.ui.jsf
-                        </Export-Package>
-                    </instructions>
-                </configuration>
-            </plugin>
-        </plugins>
-    </build>
-    <dependencies>
-        <dependency>
-            <groupId>org.primefaces</groupId>
-            <artifactId>primefaces</artifactId>
-            <version>5.2</version>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>java-hamcrest</artifactId>
-            <scope>test</scope>
-        </dependency>
-
-        <dependency>
-            <groupId>org.apache.tamaya</groupId>
-            <artifactId>tamaya-core</artifactId>
-            <version>${project.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.tamaya</groupId>
-            <artifactId>tamaya-api</artifactId>
-            <version>${project.version}</version>
-            <scope>provided</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.tamaya.ext</groupId>
-            <artifactId>tamaya-injection</artifactId>
-            <version>${project.version}</version>
-            <optional>true</optional>
-        </dependency>
-        <dependency>
-            <groupId>javax.servlet</groupId>
-            <artifactId>servlet-api</artifactId>
-            <version>2.5</version>
-            <scope>provided</scope>
-        </dependency>
-        <dependency>
-            <groupId>javax.servlet.jsp</groupId>
-            <artifactId>jsp-api</artifactId>
-            <version>2.1</version>
-            <scope>provided</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.hibernate</groupId>
-            <artifactId>hibernate-validator</artifactId>
-            <version>5.0.1.Final</version>
-        </dependency>
-
-        <!-- File Upload -->
-        <dependency>
-            <groupId>commons-fileupload</groupId>
-            <artifactId>commons-fileupload</artifactId>
-            <version>1.3</version>
-        </dependency>
-        <dependency>
-            <groupId>commons-io</groupId>
-            <artifactId>commons-io</artifactId>
-            <version>2.2</version>
-        </dependency>
-
-        <!-- Themes -->
-        <dependency>
-            <groupId>org.primefaces.themes</groupId>
-            <artifactId>all-themes</artifactId>
-            <version>1.0.10</version>
-        </dependency>
-
-        <!-- GraphicImage -->
-        <dependency>
-            <groupId>net.sourceforge.barbecue</groupId>
-            <artifactId>barbecue</artifactId>
-            <version>1.5-beta1</version>
-        </dependency>
-        <dependency>
-            <groupId>jfree</groupId>
-            <artifactId>jfreechart</artifactId>
-            <version>1.0.0</version>
-        </dependency>
-
-    </dependencies>
-
-</project>

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/jsf/src/main/webapp/index.jsf
----------------------------------------------------------------------
diff --git a/ui/jsf/src/main/webapp/index.jsf b/ui/jsf/src/main/webapp/index.jsf
deleted file mode 100644
index 28018ae..0000000
--- a/ui/jsf/src/main/webapp/index.jsf
+++ /dev/null
@@ -1,15 +0,0 @@
-<html xmlns="http://www.w3.org/1999/xhtml"
-      xmlns:h="http://java.sun.com/jsf/html"
-      xmlns:f="http://java.sun.com/jsf/core"
-      xmlns:p="http://primefaces.org/mobile">
-
-<h:head>
-
-</h:head>
-
-<h:body>
-
-    <p:spinner />
-
-</h:body>
-</html>
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/pom.xml
----------------------------------------------------------------------
diff --git a/ui/pom.xml b/ui/pom.xml
index b40563e..b3a3b95 100644
--- a/ui/pom.xml
+++ b/ui/pom.xml
@@ -23,17 +23,237 @@ under the License.
 
     <parent>
         <groupId>org.apache.tamaya.ext</groupId>
-        <artifactId>tamaya-integration-sandbox</artifactId>
+        <artifactId>tamaya-extensions</artifactId>
         <version>0.2-incubating-SNAPSHOT</version>
+        <relativePath>..</relativePath>
     </parent>
 
-    <packaging>pom</packaging>
+    <packaging>war</packaging>
     <modelVersion>4.0.0</modelVersion>
     <artifactId>tamaya-ui</artifactId>
     <name>Apache Tamaya Modules - UI</name>
 
-    <modules>
-        <module>jsf</module>
-    </modules>
+    <properties>
+        <vaadin.version>7.6.4</vaadin.version>
+        <vaadin.plugin.version>${vaadin.version}</vaadin.plugin.version>
+        <dropwizard.version>0.9.2</dropwizard.version>
+        <mainClass>org.apache.tamaya.ui.VaadinApplication</mainClass>
+        <jetty.plugin.version>9.2.3.v20140905</jetty.plugin.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <servlet.api.version>3.0.1</servlet.api.version>
+    </properties>
+
+
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>com.vaadin</groupId>
+                <artifactId>vaadin-bom</artifactId>
+                <version>${vaadin.version}</version>
+                <type>pom</type>
+                <scope>import</scope>
+            </dependency>
+            <!--<dependency>-->
+                <!--<groupId>com.vaadin</groupId>-->
+                <!--<artifactId>vaadin-server</artifactId>-->
+                <!--<version>${vaadin.version}</version>-->
+            <!--</dependency>-->
+            <dependency>
+                <groupId>io.dropwizard</groupId>
+                <artifactId>dropwizard-core</artifactId>
+                <version>${dropwizard.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>io.dropwizard</groupId>
+                <artifactId>dropwizard-assets</artifactId>
+                <version>${dropwizard.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>io.dropwizard</groupId>
+                <artifactId>dropwizard-testing</artifactId>
+                <version>${dropwizard.version}</version>
+                <scope>test</scope>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.tamaya</groupId>
+            <artifactId>tamaya-api</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.tamaya</groupId>
+            <artifactId>tamaya-core</artifactId>
+            <version>${project.version}</version>
+            <scope>runtime</scope>
+        </dependency>
+        <!--<dependency>-->
+            <!--<groupId>javax.servlet</groupId>-->
+            <!--<artifactId>javax.servlet-api</artifactId>-->
+            <!--<version>${servlet.api.version}</version>-->
+        <!--</dependency>-->
+        <dependency>
+            <groupId>com.vaadin</groupId>
+            <artifactId>vaadin-server</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.vaadin</groupId>
+            <artifactId>vaadin-push</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.vaadin</groupId>
+            <artifactId>vaadin-client-compiled</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.dropwizard</groupId>
+            <artifactId>dropwizard-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.dropwizard</groupId>
+            <artifactId>dropwizard-assets</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.dropwizard</groupId>
+            <artifactId>dropwizard-testing</artifactId>
+        </dependency>
+        <!--
+          Needed when using the widgetset optimizer (custom ConnectorBundleLoaderFactory).
+
+          For widgetset compilation, vaadin-client-compiler is automatically added on the
+          compilation classpath by vaadin-maven-plugin so normally there is no need for an
+          explicit dependency.
+        -->
+        <!--
+        <dependency>
+            <groupId>com.vaadin</groupId>
+            <artifactId>vaadin-client-compiler</artifactId>
+            <scope>provided</scope>
+        </dependency>
+        -->
+        <dependency>
+            <groupId>com.vaadin</groupId>
+            <artifactId>vaadin-themes</artifactId>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.rat</groupId>
+                <artifactId>apache-rat-plugin</artifactId>
+                <configuration>
+                    <excludes>
+                        <exclude>src/main/webapp/VAADIN/themes/mytheme/addons.scss</exclude>
+                        <exclude>src/main/webapp/VAADIN/themes/mytheme/styles.css</exclude>
+                    </excludes>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-war-plugin</artifactId>
+                <version>2.3</version>
+                <configuration>
+                    <failOnMissingWebXml>false</failOnMissingWebXml>
+                    <!-- Exclude some unnecessary files generated by the GWT compiler. -->
+                    <packagingExcludes>WEB-INF/classes/VAADIN/gwt-unitCache/**,
+                        WEB-INF/classes/VAADIN/widgetsets/WEB-INF/**</packagingExcludes>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>com.vaadin</groupId>
+                <artifactId>vaadin-maven-plugin</artifactId>
+                <version>${vaadin.plugin.version}</version>
+                <configuration>
+                    <extraJvmArgs>-Xmx512M -Xss1024k</extraJvmArgs>
+                    <webappDirectory>${basedir}/target/classes/VAADIN/widgetsets</webappDirectory>
+                    <draftCompile>false</draftCompile>
+                    <compileReport>false</compileReport>
+                    <style>OBF</style>
+                    <strict>true</strict>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>update-theme</goal>
+                            <goal>update-widgetset</goal>
+                            <goal>compile</goal>
+                            <!-- Comment out compile-theme goal to use on-the-fly theme compilation -->
+                            <goal>compile-theme</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-clean-plugin</artifactId>
+                <!--<version>2.6.1</version>-->
+                <!-- Clean up also any pre-compiled themes -->
+                <configuration>
+                    <filesets>
+                        <fileset>
+                            <directory>src/main/webapp/VAADIN/themes</directory>
+                            <includes>
+                                <include>**/styles.css</include>
+                                <include>**/styles.scss.cache</include>
+                            </includes>
+                        </fileset>
+                    </filesets>
+                </configuration>
+            </plugin>
+
+            <plugin>
+                <artifactId>maven-shade-plugin</artifactId>
+                <configuration>
+                    <createDependencyReducedPom>true</createDependencyReducedPom>
+                    <filters>
+                        <filter>
+                            <artifact>*:*</artifact>
+                            <excludes>
+                                <exclude>META-INF/*.SF</exclude>
+                                <exclude>META-INF/*.DSA</exclude>
+                                <exclude>META-INF/*.RSA</exclude>
+                            </excludes>
+                        </filter>
+                    </filters>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <transformers>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                    <mainClass>${mainClass}</mainClass>
+                                </transformer>
+                            </transformers>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+
+    <repositories>
+        <repository>
+            <id>vaadin-addons</id>
+            <url>http://maven.vaadin.com/vaadin-addons</url>
+        </repository>
+        <repository>
+            <id>vaadin-snapshots</id>
+            <url>https://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
+            <releases>
+                <enabled>false</enabled>
+            </releases>
+            <snapshots>
+                <enabled>true</enabled>
+            </snapshots>
+        </repository>
+    </repositories>
 
 </project>
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/ApplicationLayout.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/ApplicationLayout.java b/ui/src/main/java/org/apache/tamaya/ui/ApplicationLayout.java
new file mode 100644
index 0000000..7d57362
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/ApplicationLayout.java
@@ -0,0 +1,81 @@
+package org.apache.tamaya.ui;
+
+import com.vaadin.navigator.Navigator;
+import com.vaadin.navigator.View;
+import com.vaadin.ui.HorizontalLayout;
+import com.vaadin.ui.Panel;
+import org.apache.tamaya.ui.components.LazyProvider;
+import org.apache.tamaya.ui.components.PageTitleUpdater;
+import org.apache.tamaya.ui.views.ComponentView;
+import org.apache.tamaya.ui.views.ConfigView;
+import org.apache.tamaya.ui.views.ErrorView;
+import org.apache.tamaya.ui.views.HomeView;
+
+public class ApplicationLayout extends HorizontalLayout {
+
+    private NavBar navBar;
+    private Panel content;
+    private Navigator navigator;
+
+    public ApplicationLayout() {
+        addStyleName(UIConstants.MAIN_LAYOUT);
+
+        setSizeFull();
+
+        initLayouts();
+        setupNavigator();
+    }
+
+    private void initLayouts() {
+        navBar = new NavBar();
+        // Use panel as main content container to allow it's content to scroll
+        content = new Panel();
+        content.setSizeFull();
+        content.addStyleName(UIConstants.PANEL_BORDERLESS);
+
+        addComponents(navBar, content);
+        setExpandRatio(content, 1);
+    }
+
+    private void setupNavigator() {
+        navigator = new Navigator(MyUI.getCurrent(), content);
+
+        registerViews();
+
+        // Add view change listeners so we can do things like select the correct menu item and update the page title
+        navigator.addViewChangeListener(navBar);
+        navigator.addViewChangeListener(new PageTitleUpdater());
+
+        navigator.navigateTo(navigator.getState());
+    }
+
+    private void registerViews() {
+        addView(HomeView.class);
+        addView(ConfigView.class);
+        addView(ComponentView.class);
+        navigator.setErrorView(ErrorView.class);
+    }
+
+    /**
+     * Registers av given view to the navigator and adds it to the NavBar
+     */
+    private void addView(Class<? extends View> viewClass) {
+        ViewConfig viewConfig = viewClass.getAnnotation(ViewConfig.class);
+
+        switch (viewConfig.createMode()) {
+            case CREATE:
+                navigator.addView(viewConfig.uri(), viewClass);
+                break;
+            case LAZY:
+                navigator.addProvider(new LazyProvider(viewConfig.uri(), viewClass));
+                break;
+            case EAGER:
+                try {
+                    navigator.addView(viewConfig.uri(), viewClass.newInstance());
+                } catch (Exception e) {
+                    e.printStackTrace();
+                }
+        }
+        navBar.addView(viewConfig.uri(), viewConfig.displayName());
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/Content.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/Content.java b/ui/src/main/java/org/apache/tamaya/ui/Content.java
new file mode 100644
index 0000000..c03fdf1
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/Content.java
@@ -0,0 +1,34 @@
+/*
+ * 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.ui;
+
+import com.vaadin.ui.HorizontalSplitPanel;
+import com.vaadin.ui.Label;
+
+import java.io.Serializable;
+
+/**
+ * Created by atsticks on 29.03.16.
+ */
+public class Content extends HorizontalSplitPanel implements Serializable{
+
+    public Content(){
+        this.addComponents(new Label("Left"), new Label("Content"));
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/CurrentUser.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/CurrentUser.java b/ui/src/main/java/org/apache/tamaya/ui/CurrentUser.java
new file mode 100644
index 0000000..c894420
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/CurrentUser.java
@@ -0,0 +1,23 @@
+package org.apache.tamaya.ui;
+
+import com.vaadin.server.VaadinSession;
+
+/**
+ * Convenience wrapper for storing and retreiving a user from the VaadinSession
+ */
+public class CurrentUser {
+
+    private static final String KEY = "currentser";
+
+    public static void set(User user) {
+        VaadinSession.getCurrent().setAttribute(KEY, user);
+    }
+
+    public static User get() {
+        return (User) VaadinSession.getCurrent().getAttribute(KEY);
+    }
+
+    public static boolean isLoggedIn() {
+        return get() != null;
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/Header.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/Header.java b/ui/src/main/java/org/apache/tamaya/ui/Header.java
new file mode 100644
index 0000000..3e92dac
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/Header.java
@@ -0,0 +1,44 @@
+/*
+ * 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.ui;
+
+import com.vaadin.ui.Button;
+import com.vaadin.ui.HorizontalLayout;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.Link;
+import sun.awt.HorizBagLayout;
+
+import java.io.Serializable;
+
+/**
+ * Created by atsticks on 29.03.16.
+ */
+public class Header extends HorizontalLayout implements Serializable{
+
+    private Label titleLabel = new Label("Apache Tamaya");
+    private HorizontalLayout buttonBar = new HorizontalLayout();
+    private Label iconLabel = new Label();
+
+    public Header(){
+        buttonBar.addComponents(new Button("About"), new Button("Konfiguration"), new Button("PluginManagement"));
+        addComponents(titleLabel, buttonBar, iconLabel);
+    }
+
+
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/MyUI.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/MyUI.java b/ui/src/main/java/org/apache/tamaya/ui/MyUI.java
new file mode 100644
index 0000000..845c400
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/MyUI.java
@@ -0,0 +1,102 @@
+/*
+ * 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.ui;
+
+import javax.servlet.annotation.WebServlet;
+
+import com.google.common.eventbus.Subscribe;
+import com.vaadin.annotations.Theme;
+import com.vaadin.annotations.Title;
+import com.vaadin.annotations.VaadinServletConfiguration;
+import com.vaadin.navigator.Navigator;
+import com.vaadin.navigator.View;
+import com.vaadin.server.Page;
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.server.VaadinServlet;
+import com.vaadin.server.VaadinSession;
+import com.vaadin.ui.*;
+import org.apache.tamaya.ui.components.LazyProvider;
+import org.apache.tamaya.ui.components.PageTitleUpdater;
+import org.apache.tamaya.ui.event.LogoutEvent;
+import org.apache.tamaya.ui.event.NavigationEvent;
+import org.apache.tamaya.ui.views.ErrorView;
+import org.apache.tamaya.ui.views.login.LoginEvent;
+import org.apache.tamaya.ui.views.login.LoginView;
+
+/**
+ * This UI is the application entry point. A UI may either represent a browser window 
+ * (or tab) or some part of a html page where a Vaadin application is embedded.
+ * <p>
+ * The UI is initialized using {@link #init(VaadinRequest)}. This method is intended to be 
+ * overridden to add component to the user interface and initialize non-component functionality.
+ */
+@Theme("valo")
+@Title("Tamaya")
+public class MyUI extends UI {
+
+    private Header header = new Header();
+    private Content content = new Content();
+    private Navigator navigator;
+
+    @Override
+    protected void init(VaadinRequest vaadinRequest) {
+        setupEventBus();
+
+        if (CurrentUser.isLoggedIn()) {
+            setContent(new ApplicationLayout());
+        } else {
+            setContent(new LoginView());
+        }
+    }
+
+    @Subscribe
+    public void userLoggedIn(
+            LoginEvent event) {
+        CurrentUser.set(event.getUser());
+        setContent(new ApplicationLayout());
+    }
+
+    @Subscribe
+    public void navigateTo(NavigationEvent view) {
+        getNavigator().navigateTo(view.getViewName());
+    }
+
+    public static MyUI getCurrent() {
+        return (MyUI) UI.getCurrent();
+    }
+
+    @Subscribe
+    public void logout(LogoutEvent logoutEvent) {
+        // Don't invalidate the underlying HTTP session if you are using it for something else
+        VaadinSession.getCurrent().getSession().invalidate();
+        VaadinSession.getCurrent().close();
+        Page.getCurrent().reload();
+
+    }
+
+    private void setupEventBus() {
+        org.apache.tamaya.ui.event.EventBus.register(this);
+    }
+
+
+    @WebServlet(urlPatterns = "/*", name = "MyUIServlet", asyncSupported = true)
+    @VaadinServletConfiguration(ui = MyUI.class, productionMode = false)
+    public static class MyUIServlet extends VaadinServlet {
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/NavBar.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/NavBar.java b/ui/src/main/java/org/apache/tamaya/ui/NavBar.java
new file mode 100644
index 0000000..caed4cd
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/NavBar.java
@@ -0,0 +1,73 @@
+package org.apache.tamaya.ui;
+
+import com.vaadin.navigator.ViewChangeListener;
+import com.vaadin.server.FontAwesome;
+import com.vaadin.shared.ui.label.ContentMode;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.CssLayout;
+import com.vaadin.ui.Label;
+import org.apache.tamaya.ui.event.EventBus;
+import org.apache.tamaya.ui.event.LogoutEvent;
+import org.apache.tamaya.ui.event.NavigationEvent;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class NavBar extends CssLayout implements ViewChangeListener {
+
+    private Map<String, Button> buttonMap = new HashMap<>();
+
+    public NavBar() {
+        setHeight("100%");
+        addStyleName(UIConstants.MENU_ROOT);
+        addStyleName(UIConstants.NAVBAR);
+
+        Label logo = new Label("<strong>Apache Tamaya</strong>", ContentMode.HTML);
+        logo.addStyleName(UIConstants.MENU_TITLE);
+        addComponent(logo);
+
+        addLogoutButton();
+    }
+
+    private void addLogoutButton() {
+        Button logout = new Button("Log out", new Button.ClickListener() {
+            @Override
+            public void buttonClick(Button.ClickEvent clickEvent) {
+                EventBus.post(new LogoutEvent());
+            }
+        });
+        addComponent(logout);
+
+        logout.addStyleName(UIConstants.BUTTON_LOGOUT);
+        logout.addStyleName(UIConstants.BUTTON_BORDERLESS);
+        logout.setIcon(FontAwesome.SIGN_OUT);
+    }
+
+    public void addView(final String uri, String displayName) {
+        Button viewButton = new Button(displayName, new Button.ClickListener() {
+            @Override
+            public void buttonClick(Button.ClickEvent clickEvent) {
+                EventBus.post(new NavigationEvent(uri));
+            }
+        });
+        viewButton.addStyleName(UIConstants.MENU_ITEM);
+        viewButton.addStyleName(UIConstants.BUTTON_BORDERLESS);
+        buttonMap.put(uri, viewButton);
+
+        addComponent(viewButton, components.size() - 1);
+    }
+
+    @Override
+    public boolean beforeViewChange(ViewChangeEvent event) {
+        return true; // false blocks navigation, always return true here
+    }
+
+    @Override
+    public void afterViewChange(ViewChangeEvent event) {
+        for(Button button: buttonMap.values()){
+            button.removeStyleName(UIConstants.SELECTED);
+        }
+        Button button = buttonMap.get(event.getViewName());
+        if (button != null) button.addStyleName(UIConstants.SELECTED);
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/UIConstants.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/UIConstants.java b/ui/src/main/java/org/apache/tamaya/ui/UIConstants.java
new file mode 100644
index 0000000..1631e0b
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/UIConstants.java
@@ -0,0 +1,22 @@
+package org.apache.tamaya.ui;
+
+import com.vaadin.ui.themes.ValoTheme;
+
+/**
+ * Helper for theme. Less typos in CSS style names and easier to find usages in project.
+ */
+public class UIConstants extends ValoTheme {
+
+    public static final String MAIN_LAYOUT = "main-layout";
+    public static final String NAVBAR = "navbar";
+    public static final String SELECTED = "selected";
+    public static final String LOGIN_BOX = "login-box";
+
+
+    public static final String BUTTON_LOGOUT = "logout";
+    public static final String ORDER_LAYOUT = "order-layout";
+    public static final String ORDER_ID = "order-id";
+    public static final String ORDER_TOTAL = "order-total";
+
+    public static final String LAYOUT_VIEW = "layout-view";
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/User.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/User.java b/ui/src/main/java/org/apache/tamaya/ui/User.java
new file mode 100644
index 0000000..bf01664
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/User.java
@@ -0,0 +1,34 @@
+package org.apache.tamaya.ui;
+
+import java.util.Date;
+import java.util.Objects;
+
+/**
+ * Created by atsticks on 29.03.16.
+ */
+public class User {
+
+    private String userID = "-";
+    private String fulLName = "<unknown>";
+    private Date logInDate = new Date();
+
+    public User(String userID, String fullName){
+        this.userID = Objects.requireNonNull(userID);
+        this.fulLName = fullName;
+        if(fullName==null){
+            this.fulLName = userID;
+        }
+    }
+
+    public String getUserID() {
+        return userID;
+    }
+
+    public String getFullName() {
+        return fulLName;
+    }
+
+    public String getLoginDate(){
+        return logInDate.toString();
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/VaadinApplication.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/VaadinApplication.java b/ui/src/main/java/org/apache/tamaya/ui/VaadinApplication.java
new file mode 100644
index 0000000..7931a4b
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/VaadinApplication.java
@@ -0,0 +1,93 @@
+/*
+ * 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.ui;
+
+import com.vaadin.annotations.VaadinServletConfiguration;
+import com.vaadin.server.VaadinServlet;
+import io.dropwizard.Application;
+import io.dropwizard.configuration.ConfigurationSourceProvider;
+import io.dropwizard.setup.Bootstrap;
+import io.dropwizard.setup.Environment;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.logging.Logger;
+
+public class VaadinApplication extends Application<VaadinApplication.Configuration> {
+
+    private static final Logger LOG = Logger.getLogger(VaadinApplication.class.getName());
+
+    @Override
+    public void run(Configuration configuration, Environment environment) throws Exception {
+        // empty
+    }
+
+    @Override
+    public void initialize(Bootstrap<Configuration> bootstrap) {
+        bootstrap.setConfigurationSourceProvider(new AdaptiveConfigurationsourceProvider());
+        bootstrap.addBundle(new VaadinBundle(MyUI.MyUIServlet.class, "/tamaya/*"));
+    }
+
+    /**
+     * Configuration source provider that reads from a file (similar to the default), but if not present/resovable also
+     * tries to resolve the path as URL or classpath resource.
+     */
+    private static class AdaptiveConfigurationsourceProvider implements ConfigurationSourceProvider{
+
+        @Override
+        public InputStream open(String path) throws IOException {
+            File file = new File(path);
+            if (file.exists()) {
+                LOG.info("Reading configuration from file: " + path);
+                return new FileInputStream(file);
+            }
+            try {
+                URL url = new URL(path);
+                LOG.info("Reading configuration from url: " + path);
+                return url.openStream();
+
+            } catch (Exception e) {
+                // continue
+            }
+            URL url = getClass().getClassLoader().getResource(path);
+            if (url != null) {
+                LOG.info("Reading configuration from classpath: " + path);
+                return url.openStream();
+            }
+            // try default
+            url = getClass().getClassLoader().getResource("/config/application.yml");
+            if (url != null) {
+                LOG.info("Reading configuration from classpath: /config/application.yml");
+                return url.openStream();
+            }
+            return null;
+        }
+    }
+
+    public static class Configuration extends io.dropwizard.Configuration {
+        public String name;
+    }
+
+    public static void main(String... args) throws Exception {
+        new VaadinApplication().run(args);
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/VaadinBundle.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/VaadinBundle.java b/ui/src/main/java/org/apache/tamaya/ui/VaadinBundle.java
new file mode 100644
index 0000000..dcdce66
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/VaadinBundle.java
@@ -0,0 +1,55 @@
+/*
+ * 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.ui;
+
+import com.google.common.collect.Maps;
+import io.dropwizard.Bundle;
+import io.dropwizard.assets.AssetsBundle;
+import io.dropwizard.setup.Bootstrap;
+import io.dropwizard.setup.Environment;
+import org.eclipse.jetty.server.session.SessionHandler;
+
+import javax.servlet.Servlet;
+import java.util.Map;
+
+public class VaadinBundle implements Bundle {
+
+    private final Map<String, Class<? extends Servlet>> servlets = Maps.newLinkedHashMap();
+
+    private final SessionHandler sessionHandler;
+
+
+    public VaadinBundle(Class<? extends Servlet> servlet, String pathSpec) {
+        this.sessionHandler = new SessionHandler();
+        servlets.put(pathSpec, servlet);
+    }
+
+    @Override
+    public void initialize(Bootstrap<?> bootstrap) {
+        bootstrap.addBundle(new AssetsBundle("/VAADIN", "/VAADIN", null, "vaadin"));
+    }
+
+    @Override
+    public void run(Environment environment) {
+        environment.servlets().setSessionHandler(sessionHandler);
+        for (Map.Entry<String, Class<? extends Servlet>> servlet : servlets.entrySet()) {
+            environment.getApplicationContext().addServlet(servlet.getValue(), servlet.getKey());
+        }
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/ViewConfig.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/ViewConfig.java b/ui/src/main/java/org/apache/tamaya/ui/ViewConfig.java
new file mode 100644
index 0000000..0ab0c66
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/ViewConfig.java
@@ -0,0 +1,20 @@
+package org.apache.tamaya.ui;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation for easily collecting View meta info.
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface ViewConfig {
+
+    enum CreateMode {CREATE, LAZY, EAGER}
+
+    String uri();
+    String displayName();
+    CreateMode createMode() default CreateMode.CREATE;
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/components/LazyProvider.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/components/LazyProvider.java b/ui/src/main/java/org/apache/tamaya/ui/components/LazyProvider.java
new file mode 100644
index 0000000..ca36a21
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/components/LazyProvider.java
@@ -0,0 +1,24 @@
+package org.apache.tamaya.ui.components;
+
+import com.vaadin.navigator.Navigator;
+import com.vaadin.navigator.View;
+
+/**
+ * Lazily initializes a view when it's first accessed, then always returns the
+ * same instance on subsequent calls.
+ */
+public class LazyProvider extends Navigator.ClassBasedViewProvider {
+    private View view;
+
+    public LazyProvider(String viewName, Class<? extends View> viewClass) {
+        super(viewName, viewClass);
+    }
+
+    @Override
+    public View getView(String viewName) {
+        if (view == null) {
+            view = super.getView(viewName);
+        }
+        return view;
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/components/PageTitleUpdater.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/components/PageTitleUpdater.java b/ui/src/main/java/org/apache/tamaya/ui/components/PageTitleUpdater.java
new file mode 100644
index 0000000..37a6e8f
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/components/PageTitleUpdater.java
@@ -0,0 +1,25 @@
+package org.apache.tamaya.ui.components;
+
+import com.vaadin.navigator.View;
+import com.vaadin.navigator.ViewChangeListener;
+import com.vaadin.server.Page;
+import org.apache.tamaya.ui.ViewConfig;
+
+public class PageTitleUpdater implements ViewChangeListener {
+    @Override
+    public boolean beforeViewChange(ViewChangeEvent event) {
+        return true;
+    }
+
+    @Override
+    public void afterViewChange(ViewChangeEvent event) {
+
+        View view = event.getNewView();
+        ViewConfig viewConfig = view.getClass().getAnnotation(ViewConfig.class);
+
+        if (viewConfig != null) {
+            Page.getCurrent().setTitle(viewConfig.displayName());
+        }
+
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/components/VerticalSpacedLayout.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/components/VerticalSpacedLayout.java b/ui/src/main/java/org/apache/tamaya/ui/components/VerticalSpacedLayout.java
new file mode 100644
index 0000000..52fe525
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/components/VerticalSpacedLayout.java
@@ -0,0 +1,14 @@
+package org.apache.tamaya.ui.components;
+
+import com.vaadin.ui.VerticalLayout;
+
+/**
+ * Vertical layout with spacing and margin on by default
+ */
+public class VerticalSpacedLayout extends VerticalLayout {
+
+    public VerticalSpacedLayout() {
+        setMargin(true);
+        setSpacing(true);
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/event/EventBus.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/event/EventBus.java b/ui/src/main/java/org/apache/tamaya/ui/event/EventBus.java
new file mode 100644
index 0000000..d269dc3
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/event/EventBus.java
@@ -0,0 +1,34 @@
+package org.apache.tamaya.ui.event;
+
+
+import com.google.common.eventbus.SubscriberExceptionContext;
+import com.google.common.eventbus.SubscriberExceptionHandler;
+
+/**
+ * Convenience class for accessing the _UI Scoped_ EventBus. If you are using something like the CDI event
+ * bus, you don't need a class like this.
+ */
+public final class EventBus {
+
+    private static final com.google.common.eventbus.EventBus EVENT_BUS =
+            new com.google.common.eventbus.EventBus(new SubscriberExceptionHandler(){
+                @Override
+                public void handleException(Throwable throwable, SubscriberExceptionContext subscriberExceptionContext) {
+                    throwable.printStackTrace();
+                }
+            });
+
+    private EventBus(){}
+
+    public static void register(final Object listener) {
+        EVENT_BUS.register(listener);
+    }
+
+    public static void unregister(final Object listener) {
+        EVENT_BUS.unregister(listener);
+    }
+
+    public static void post(final Object event) {
+        EVENT_BUS.post(event);
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/event/LogoutEvent.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/event/LogoutEvent.java b/ui/src/main/java/org/apache/tamaya/ui/event/LogoutEvent.java
new file mode 100644
index 0000000..3168a76
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/event/LogoutEvent.java
@@ -0,0 +1,4 @@
+package org.apache.tamaya.ui.event;
+
+public class LogoutEvent {
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/event/NavigationEvent.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/event/NavigationEvent.java b/ui/src/main/java/org/apache/tamaya/ui/event/NavigationEvent.java
new file mode 100644
index 0000000..0ec1ec5
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/event/NavigationEvent.java
@@ -0,0 +1,14 @@
+package org.apache.tamaya.ui.event;
+
+
+public class NavigationEvent {
+    private String viewName;
+
+    public NavigationEvent(String viewName) {
+        this.viewName = viewName;
+    }
+
+    public String getViewName() {
+        return viewName;
+    }
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/services/LoginService.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/services/LoginService.java b/ui/src/main/java/org/apache/tamaya/ui/services/LoginService.java
new file mode 100644
index 0000000..ceb4cc0
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/services/LoginService.java
@@ -0,0 +1,12 @@
+package org.apache.tamaya.ui.services;
+
+import org.apache.tamaya.ui.User;
+
+/**
+ * Created by atsticks on 29.03.16.
+ */
+public interface LoginService {
+
+    User login(String userId, String credentials);
+
+}

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/views/ComponentView.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/views/ComponentView.java b/ui/src/main/java/org/apache/tamaya/ui/views/ComponentView.java
new file mode 100644
index 0000000..abfdb11
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/views/ComponentView.java
@@ -0,0 +1,128 @@
+package org.apache.tamaya.ui.views;
+
+import com.vaadin.navigator.View;
+import com.vaadin.navigator.ViewChangeListener;
+import com.vaadin.shared.ui.label.ContentMode;
+import com.vaadin.ui.*;
+import org.apache.tamaya.Configuration;
+import org.apache.tamaya.ConfigurationProvider;
+import org.apache.tamaya.TypeLiteral;
+import org.apache.tamaya.spi.*;
+import org.apache.tamaya.ui.UIConstants;
+import org.apache.tamaya.ui.ViewConfig;
+import org.apache.tamaya.ui.components.VerticalSpacedLayout;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+
+
+@ViewConfig(uri = "/components", displayName = "Components")
+public class ComponentView extends VerticalSpacedLayout implements View {
+
+    private Tree configTree = new Tree("Components");
+
+
+    public ComponentView() {
+        Label caption = new Label("Components");
+        Label description = new Label(
+                "This view shows the components currently active. This information may be useful when checking if an" +
+                        "configuration extension is loaded and for inspection of the configuration and property sources" +
+                        "invovlved.",
+                ContentMode.HTML);
+
+        fillComponentTree();
+
+        addComponents(caption, description, configTree);
+
+        caption.addStyleName(UIConstants.LABEL_HUGE);
+        description.addStyleName(UIConstants.LABEL_LARGE);
+
+    }
+
+    private void fillComponentTree() {
+        configTree.removeAllItems();
+        Configuration config = ConfigurationProvider.getConfiguration();
+
+        String currentParent = "General";
+        configTree.addItem(currentParent);
+        configTree.addItem("Configuration.class");
+        configTree.setItemCaption("Configuration.class", "Configuration class = " + config.getClass().getName());
+        configTree.setParent("Configuration.class", currentParent);
+        configTree.setChildrenAllowed("Configuration.class", false);
+
+        configTree.addItem("ConfigurationContext.class");
+        configTree.setItemCaption("ConfigurationContext.class", "ConfigurationContext class = " + config.getContext().getClass().getName());
+        configTree.setParent("ConfigurationContext.class", currentParent);
+        configTree.setChildrenAllowed("ConfigurationContext.class", false);
+
+        configTree.addItem("PropertyValueCombinationPolicy.class");
+        configTree.setItemCaption("PropertyValueCombinationPolicy.class", PropertyValueCombinationPolicy.class.getSimpleName() + " class = " + config.getContext().getPropertyValueCombinationPolicy().getClass().getName());
+        configTree.setParent("PropertyValueCombinationPolicy.class", currentParent);
+        configTree.setChildrenAllowed("PropertyValueCombinationPolicy.class", false);
+
+        configTree.addItem("ConfigurationContext.types");
+        configTree.setItemCaption("ConfigurationContext.types", "Configurable types");
+        configTree.setParent("ConfigurationContext.types", currentParent);
+        for(Map.Entry<TypeLiteral<?>,List<PropertyConverter<?>>> en:config.getContext().getPropertyConverters().entrySet()){
+            configTree.addItem(en.getKey());
+            configTree.setItemCaption(en.getKey(), "Type = " + en.getKey().toString());
+            configTree.setParent(en.getKey(), "ConfigurationContext.types");
+            for(PropertyConverter conv: en.getValue()){
+                configTree.addItem(conv);
+                configTree.setItemCaption(conv, conv.getClass().getName());
+                configTree.setChildrenAllowed(conv, false);
+                configTree.setParent(conv, en.getKey());
+            }
+        }
+        configTree.addItem("ConfigurationContext.filters");
+        configTree.setItemCaption("ConfigurationContext.filters", "Property Filters");
+        for(PropertyFilter filter: config.getContext().getPropertyFilters()){
+            configTree.addItem(filter);
+            configTree.setItemCaption(filter, filter.getClass().getName());
+            configTree.setChildrenAllowed(filter, false);
+            configTree.setParent(filter, "ConfigurationContext.filters");
+        }
+        configTree.addItem("ConfigurationContext.sources");
+        configTree.setItemCaption("ConfigurationContext.sources", "Property Sources");
+        for(PropertySource source: config.getContext().getPropertySources()){
+            configTree.addItem(source);
+            configTree.setItemCaption(source, "name = "+source.getName());
+            configTree.setParent(source, "ConfigurationContext.sources");
+
+            configTree.addItem(source.toString() + ".ordinal");
+            configTree.setItemCaption(source.toString() + ".ordinal", "ordinal = "+source.getOrdinal());
+            configTree.setParent(source.toString() + ".ordinal", source);
+            configTree.setChildrenAllowed(source.toString() + ".ordinal", false);
+            configTree.addItem(source.toString() + ".class");
+            configTree.setItemCaption(source.toString() + ".class", "class = "+source.getClass().getName());
+            configTree.setChildrenAllowed(source.toString() + ".class", false);
+            configTree.setParent(source.toString() + ".class", source);
+            Map<String,String> props = source.getProperties();
+            configTree.addItem(props);
+            configTree.setItemCaption(props, "properties:");
+            configTree.setParent(props, source);
+            for(Map.Entry propEn:props.entrySet()){
+                String entryKey = props.hashCode() + propEn.getKey().toString();
+                configTree.addItem(entryKey);
+                configTree.setChildrenAllowed(entryKey, false);
+                configTree.setItemCaption(entryKey, propEn.getKey() + "=" + propEn.getValue());
+                configTree.setParent(entryKey, props);
+            }
+        }
+    }
+
+    private String getCaption(String key, String value) {
+        int index = key.lastIndexOf('.');
+        if(index<0){
+            return key + " = " + value;
+        }else{
+            return key.substring(index+1) + " = " + value;
+        }
+    }
+
+    @Override
+    public void enter(ViewChangeListener.ViewChangeEvent event) {
+
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/views/ConfigView.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/views/ConfigView.java b/ui/src/main/java/org/apache/tamaya/ui/views/ConfigView.java
new file mode 100644
index 0000000..c3828f9
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/views/ConfigView.java
@@ -0,0 +1,113 @@
+package org.apache.tamaya.ui.views;
+
+import com.vaadin.navigator.View;
+import com.vaadin.navigator.ViewChangeListener;
+import com.vaadin.shared.ui.label.ContentMode;
+import com.vaadin.ui.*;
+import org.apache.tamaya.ConfigurationProvider;
+import org.apache.tamaya.ui.CurrentUser;
+import org.apache.tamaya.ui.UIConstants;
+import org.apache.tamaya.ui.ViewConfig;
+import org.apache.tamaya.ui.components.VerticalSpacedLayout;
+
+import java.util.Map;
+
+
+@ViewConfig(uri = "/config", displayName = "Configuration")
+public class ConfigView extends VerticalSpacedLayout implements View {
+
+    private TextField keyFilter = new TextField("Key filter");
+    private TextField valueFilter = new TextField("Value filter");
+    private Tree tree = new Tree("Current Configuration");
+
+    public ConfigView() {
+        Label caption = new Label("Raw Configuration");
+        Label description = new Label(
+                "This view shows the overall <b>raw</b> configuration tree. Dependening on your access rights you" +
+                        "may see partial or masked data. Similarly configuration can be <i>read-only</i> or <i>mutable</i>.",
+                ContentMode.HTML);
+        HorizontalLayout filters = new HorizontalLayout();
+
+        Button filterButton = new Button("Filter", new Button.ClickListener() {
+            @Override
+            public void buttonClick(Button.ClickEvent clickEvent) {
+                fillTree();
+            }
+        });
+        filters.setDefaultComponentAlignment(Alignment.BOTTOM_LEFT);
+        filters.addComponents(keyFilter, valueFilter, filterButton);
+
+        fillTree();
+
+        addComponents(caption, description, filters, tree);
+
+        caption.addStyleName(UIConstants.LABEL_HUGE);
+        description.addStyleName(UIConstants.LABEL_LARGE);
+
+    }
+
+    private void fillTree() {
+        String keyFilterExp = this.keyFilter.getValue();
+        if(keyFilterExp.isEmpty()){
+            keyFilterExp = null;
+        }
+        String valueFilterExp = this.valueFilter.getValue();
+        if(valueFilterExp.isEmpty()){
+            valueFilterExp = null;
+        }
+        tree.removeAllItems();
+        for(Map.Entry<String,String> entry: ConfigurationProvider.getConfiguration().getProperties().entrySet()){
+            String key = entry.getKey();
+            if(keyFilterExp!=null && !key.matches(keyFilterExp)){
+                continue;
+            }
+            if(valueFilterExp!=null && !entry.getValue().matches(valueFilterExp)){
+                continue;
+            }
+            tree.addItem(key);
+            tree.setItemCaption(key, getCaption(key, entry.getValue()));
+            tree.setChildrenAllowed(key, false);
+            String parent = null;
+            int start = 0;
+            int index = key.indexOf('.', start);
+            while(index>0){
+                String subItem = key.substring(0,index);
+                String caption = key.substring(start, index);
+                tree.addItem(subItem);
+                tree.setItemCaption(subItem, caption);
+                if(parent!=null){
+                    tree.setParent(subItem, parent);
+                }
+                parent = subItem;
+                start = index+1;
+                index = key.indexOf('.', start);
+            }
+            String lastItem = key.substring(start);
+            if(!lastItem.equals(key)){
+                if(parent!=null){
+                    tree.setParent(key, parent);
+                }else{
+                    // should not happen
+                }
+            }else{ // singl root entry
+                if(parent!=null) {
+                    tree.setParent(key, parent);
+                }
+            }
+        }
+    }
+
+    private String getCaption(String key, String value) {
+        int index = key.lastIndexOf('.');
+        if(index<0){
+            return key + " = " + value;
+        }else{
+            return key.substring(index+1) + " = " + value;
+        }
+    }
+
+    @Override
+    public void enter(ViewChangeListener.ViewChangeEvent event) {
+
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/views/ErrorView.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/views/ErrorView.java b/ui/src/main/java/org/apache/tamaya/ui/views/ErrorView.java
new file mode 100644
index 0000000..ba16bf2
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/views/ErrorView.java
@@ -0,0 +1,21 @@
+package org.apache.tamaya.ui.views;
+
+import com.vaadin.navigator.View;
+import com.vaadin.navigator.ViewChangeListener;
+import com.vaadin.ui.Alignment;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.VerticalLayout;
+import org.apache.tamaya.ui.UIConstants;
+
+public class ErrorView extends VerticalLayout implements View {
+    @Override
+    public void enter(ViewChangeListener.ViewChangeEvent event) {
+        setSizeFull();
+        setMargin(true);
+        Label label = new Label("Could not find a view with that name. You are most likely doing it wrong.");
+        label.addStyleName(UIConstants.LABEL_FAILURE);
+
+        addComponent(label);
+        setComponentAlignment(label, Alignment.MIDDLE_CENTER);
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/views/HomeView.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/views/HomeView.java b/ui/src/main/java/org/apache/tamaya/ui/views/HomeView.java
new file mode 100644
index 0000000..c656389
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/views/HomeView.java
@@ -0,0 +1,34 @@
+package org.apache.tamaya.ui.views;
+
+import com.vaadin.navigator.View;
+import com.vaadin.navigator.ViewChangeListener;
+import com.vaadin.shared.ui.label.ContentMode;
+import com.vaadin.ui.Label;
+import org.apache.tamaya.ui.CurrentUser;
+import org.apache.tamaya.ui.UIConstants;
+import org.apache.tamaya.ui.ViewConfig;
+import org.apache.tamaya.ui.components.VerticalSpacedLayout;
+
+
+@ViewConfig(uri = "", displayName = "Home")
+public class HomeView extends VerticalSpacedLayout implements View {
+
+    public HomeView() {
+        Label caption = new Label("Welcome, " + CurrentUser.get().getUserID());
+        Label description = new Label(
+                "<b>Apache Tamaya</b> is an API and extendable framework for accessing and managing configuration.<br/> \n" +
+                        "Please check the project's home page <a href='http://tamaya.incubator.apache.org'>http://tamaya.incubator.apache.org</a>.",
+                ContentMode.HTML);
+
+        addComponents(caption, description);
+
+        caption.addStyleName(UIConstants.LABEL_HUGE);
+        description.addStyleName(UIConstants.LABEL_LARGE);
+
+    }
+
+    @Override
+    public void enter(ViewChangeListener.ViewChangeEvent event) {
+
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginBox.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginBox.java b/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginBox.java
new file mode 100644
index 0000000..83d6b20
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginBox.java
@@ -0,0 +1,88 @@
+package org.apache.tamaya.ui.views.login;
+
+import com.vaadin.event.ShortcutAction;
+import com.vaadin.ui.*;
+import org.apache.tamaya.ui.UIConstants;
+import org.apache.tamaya.ui.User;
+import org.apache.tamaya.ui.event.EventBus;
+import org.apache.tamaya.ui.services.LoginService;
+
+
+public class LoginBox extends VerticalLayout {
+
+    private LoginService loginService = new LoginService() {
+        @Override
+        public User login(String userId, String credentials) {
+            if("admin".equals(userId)){
+                return new User("admin", "Administrator");
+            }
+            return null;
+        }
+    }; // TODO Load
+    private TextField username;
+    private PasswordField password;
+
+    public LoginBox() {
+        setWidth("400px");
+        addStyleName(UIConstants.LOGIN_BOX);
+        setSpacing(true);
+        setMargin(true);
+
+        addCaption();
+        addForm();
+        addButtons();
+    }
+
+    private void addCaption() {
+        Label caption = new Label("Login to system");
+        addComponent(caption);
+
+        caption.addStyleName(UIConstants.LABEL_H1);
+    }
+
+    private void addForm() {
+        FormLayout loginForm = new FormLayout();
+        username = new TextField("Username");
+        password = new PasswordField("Password");
+        loginForm.addComponents(username, password);
+        addComponent(loginForm);
+        loginForm.setSpacing(true);
+        for(Component component:loginForm){
+            component.setWidth("100%");
+        }
+        username.focus();
+    }
+
+    private void addButtons() {
+        HorizontalLayout buttonsLayout = new HorizontalLayout();
+        Button forgotButton = new Button("Forgot", new Button.ClickListener() {
+            @Override
+            public void buttonClick(Button.ClickEvent clickEvent) {
+                Notification.show("Not implemented", Notification.Type.TRAY_NOTIFICATION);
+            }
+        });
+        Button loginButton = new Button("Login", new Button.ClickListener() {
+            @Override
+            public void buttonClick(Button.ClickEvent clickEvent) {
+                login();
+            }
+        });
+        buttonsLayout.addComponents(forgotButton, loginButton);
+        addComponent(buttonsLayout);
+        buttonsLayout.setSpacing(true);
+        forgotButton.addStyleName(UIConstants.BUTTON_LINK);
+        loginButton.addStyleName(UIConstants.BUTTON_PRIMARY);
+        loginButton.setClickShortcut(ShortcutAction.KeyCode.ENTER);
+        setComponentAlignment(buttonsLayout, Alignment.BOTTOM_RIGHT);
+    }
+
+    private void login() {
+        User user = loginService.login(username.getValue(), password.getValue());
+        if(user!=null){
+            EventBus.post(new LoginEvent(user));
+        }else{
+            Notification.show("Login failed.", "Hint: use any non-empty strings", Notification.Type.WARNING_MESSAGE);
+            username.focus();
+        }
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginEvent.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginEvent.java b/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginEvent.java
new file mode 100644
index 0000000..b6ba2b4
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginEvent.java
@@ -0,0 +1,15 @@
+package org.apache.tamaya.ui.views.login;
+
+import org.apache.tamaya.ui.User;
+
+public class LoginEvent {
+    private User user;
+
+    public LoginEvent(User user) {
+        this.user = user;
+    }
+
+    public User getUser() {
+        return user;
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginView.java
----------------------------------------------------------------------
diff --git a/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginView.java b/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginView.java
new file mode 100644
index 0000000..e1181d1
--- /dev/null
+++ b/ui/src/main/java/org/apache/tamaya/ui/views/login/LoginView.java
@@ -0,0 +1,13 @@
+package org.apache.tamaya.ui.views.login;
+
+import com.vaadin.ui.Alignment;
+import com.vaadin.ui.VerticalLayout;
+
+public class LoginView extends VerticalLayout {
+
+    public LoginView() {
+        setSizeFull();
+        setDefaultComponentAlignment(Alignment.MIDDLE_CENTER);
+        addComponent(new LoginBox());
+    }
+}
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/main/resources/config/application.yml
----------------------------------------------------------------------
diff --git a/ui/src/main/resources/config/application.yml b/ui/src/main/resources/config/application.yml
new file mode 100644
index 0000000..a0a6fad
--- /dev/null
+++ b/ui/src/main/resources/config/application.yml
@@ -0,0 +1,9 @@
+server:
+  type: default
+  maxThreads: 1024
+  applicationConnectors:
+      - type: http
+        port: 8090
+  adminConnectors:
+      - type: http
+        port: 8091
\ No newline at end of file

http://git-wip-us.apache.org/repos/asf/incubator-tamaya-sandbox/blob/c4c3d9b2/ui/src/test/resources/config/application.yml
----------------------------------------------------------------------
diff --git a/ui/src/test/resources/config/application.yml b/ui/src/test/resources/config/application.yml
new file mode 100644
index 0000000..9ec8d5b
--- /dev/null
+++ b/ui/src/test/resources/config/application.yml
@@ -0,0 +1,13 @@
+server:
+  type: default
+  maxThreads: 1024
+  applicationConnectors:
+      - type: http
+        port: 8090
+      - type: https
+        port: 8453
+  adminConnectors:
+      - type: http
+        port: 8091
+      - type: https
+        port: 8453
\ No newline at end of file


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