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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