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From "Ancoron Luciferis (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CXF-3613) Various problems with "java.lang.Class"
Date Wed, 22 Jun 2011 23:38:47 GMT
Various problems with "java.lang.Class"
---------------------------------------

                 Key: CXF-3613
                 URL: https://issues.apache.org/jira/browse/CXF-3613
             Project: CXF
          Issue Type: Bug
          Components: Aegis Databinding
    Affects Versions: 2.4.1
            Reporter: Ancoron Luciferis
            Priority: Critical


I just noted that the following exception is thrown when trying to create server for some
service interface that contains some reference to "java.lang.Class".

Consider a service interface like this:
{code:java}
package org.apache.cxf.aegis.type.java5;

import java.io.Serializable;

public class GenericsService {

    public <T extends Serializable> T createInstance(Class<T> type)
        throws InstantiationException, IllegalAccessException {
        return type.newInstance();
    }
}
{code}

\\
The problem is, that during creation time it throws a NullPointerException like this:
{noformat}
java.lang.NullPointerException
	at org.apache.cxf.aegis.type.basic.BeanTypeInfo$1.compare(BeanTypeInfo.java:307)
	at org.apache.cxf.aegis.type.basic.BeanTypeInfo$1.compare(BeanTypeInfo.java:306)
	at java.util.Arrays.mergeSort(Arrays.java:1270)
	at java.util.Arrays.mergeSort(Arrays.java:1282)
	at java.util.Arrays.mergeSort(Arrays.java:1281)
	at java.util.Arrays.mergeSort(Arrays.java:1281)
	at java.util.Arrays.sort(Arrays.java:1210)
	at org.apache.cxf.aegis.type.basic.BeanTypeInfo.initializeProperties(BeanTypeInfo.java:305)
	at org.apache.cxf.aegis.type.basic.BeanTypeInfo.<init>(BeanTypeInfo.java:75)
	at org.apache.cxf.aegis.type.java5.AnnotatedTypeInfo.<init>(AnnotatedTypeInfo.java:41)
	at org.apache.cxf.aegis.type.java5.AnnotatedTypeInfo.<init>(AnnotatedTypeInfo.java:36)
	at org.apache.cxf.aegis.type.java5.Java5TypeCreator.createDefaultType(Java5TypeCreator.java:208)
	at org.apache.cxf.aegis.type.XMLTypeCreator.createDefaultType(XMLTypeCreator.java:398)
	at org.apache.cxf.aegis.type.AbstractTypeCreator.createTypeForClass(AbstractTypeCreator.java:135)
	at org.apache.cxf.aegis.databinding.AegisDatabinding.getParameterType(AegisDatabinding.java:574)
	at org.apache.cxf.aegis.databinding.AegisDatabinding.initializeMessage(AegisDatabinding.java:315)
	at org.apache.cxf.aegis.databinding.AegisDatabinding.initializeOperation(AegisDatabinding.java:273)
	at org.apache.cxf.aegis.databinding.AegisDatabinding.initialize(AegisDatabinding.java:239)
	at org.apache.cxf.service.factory.AbstractServiceFactoryBean.initializeDataBindings(AbstractServiceFactoryBean.java:86)
	at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.buildServiceFromClass(ReflectionServiceFactoryBean.java:438)
	at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.initializeServiceModel(ReflectionServiceFactoryBean.java:501)
	at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.create(ReflectionServiceFactoryBean.java:241)
	at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java:101)
	at org.apache.cxf.frontend.ServerFactoryBean.create(ServerFactoryBean.java:157)
	at org.apache.cxf.dosgi.dsw.handlers.HttpServiceConfigurationTypeHandler.createServer(HttpServiceConfigurationTypeHandler.java:169)
	at org.apache.cxf.dosgi.dsw.service.RemoteServiceAdminCore.exportService(RemoteServiceAdminCore.java:245)
	at org.apache.cxf.dosgi.dsw.service.RemoteServiceAdminInstance$1.run(RemoteServiceAdminInstance.java:78)
	at org.apache.cxf.dosgi.dsw.service.RemoteServiceAdminInstance$1.run(RemoteServiceAdminInstance.java:71)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.apache.cxf.dosgi.dsw.service.RemoteServiceAdminInstance.exportService(RemoteServiceAdminInstance.java:71)
	at org.apache.cxf.dosgi.dsw.service.RemoteServiceAdminInstance.exportService(RemoteServiceAdminInstance.java:40)
	at org.apache.cxf.dosgi.topologymanager.TopologyManager$2.run(TopologyManager.java:259)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:662)
{noformat}

The cause for this is that the "{{org.springframework.beans.BeanUtils#getPropertyDescriptor}}"
method returns "{{null}}" for the property "{{classLoader}}". However, this is not a real
problem, so as a test I just modified the "{{org.apache.cxf.aegis.type.basic.BeanTypeInfo#initializeProperties}}"
method to omit any {{PropertyDescriptor}} that is {{null}}.

So far so good, but immediately afterwards, I get the next error:
{noformat}
java.lang.NullPointerException
	at java.lang.reflect.Array.newArray(Native Method)
	at java.lang.reflect.Array.newInstance(Array.java:52)
	at org.apache.cxf.aegis.type.TypeUtil.getTypeRelatedClass(TypeUtil.java:261)
	at org.apache.cxf.aegis.type.AbstractTypeCreator.createTypeForClass(AbstractTypeCreator.java:108)
	at org.apache.cxf.aegis.type.AbstractTypeCreator.createType(AbstractTypeCreator.java:395)
	at org.apache.cxf.aegis.type.basic.BeanTypeInfo.getType(BeanTypeInfo.java:196)
	at org.apache.cxf.aegis.type.basic.BeanType.getDependencies(BeanType.java:532)
	at org.apache.cxf.aegis.databinding.AegisDatabinding.addDependencies(AegisDatabinding.java:394)
	at org.apache.cxf.aegis.databinding.AegisDatabinding.initializeMessage(AegisDatabinding.java:370)
	at org.apache.cxf.aegis.databinding.AegisDatabinding.initializeOperation(AegisDatabinding.java:273)
	at org.apache.cxf.aegis.databinding.AegisDatabinding.initialize(AegisDatabinding.java:239)
	at org.apache.cxf.service.factory.AbstractServiceFactoryBean.initializeDataBindings(AbstractServiceFactoryBean.java:86)
	at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.buildServiceFromClass(ReflectionServiceFactoryBean.java:438)
	at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.initializeServiceModel(ReflectionServiceFactoryBean.java:501)
	at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.create(ReflectionServiceFactoryBean.java:241)
	at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java:101)
	at org.apache.cxf.frontend.ServerFactoryBean.create(ServerFactoryBean.java:157)
	at org.apache.cxf.aegis.AbstractAegisTest.createService(AbstractAegisTest.java:151)
	at org.apache.cxf.aegis.type.java5.GenericsTypeTest.testCreateService(GenericsTypeTest.java:85)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
	at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
	at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:53)
	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:119)
	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:101)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.maven.surefire.booter.ProviderFactory$ClassLoaderProxy.invoke(ProviderFactory.java:103)
	at $Proxy0.invoke(Unknown Source)
	at org.apache.maven.surefire.booter.SurefireStarter.invokeProvider(SurefireStarter.java:150)
	at org.apache.maven.surefire.booter.SurefireStarter.runSuitesInProcess(SurefireStarter.java:91)
	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:69)
{noformat}

\\
This one is for the property "{{java.lang.Class#enumConstants}}" and I guess there are even
more errors coming.

What I had in ming was to substitute "java.lang.Class" with "java.lang.String" on-the-fly,
so that there is an automatic default handling, e.g.:
* {{public <T extends Serializable> T createInstance(Class<T> type)}} will become
something like {{public Serializable createInstance(String type)}}
* {{public Class getType(Serializable obj)}} will become something like {{public String getType(Serializable
obj)}}

...so that CXF internally does something like "{{ClassLoaderUtils.loadClass(type, refClass);}}"
and "{{type.getName()}}" for the other way around.

What do you think?

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