[jboss-jira] [JBoss JIRA] (JBRULES-3122) Classloading error with AspectJ and Drools 5.2.0.Final

[Jesper S. Møller (JIRA)]

    [ https://issues.jboss.org/browse/JBRULES-3122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662747#comment-12662747 ] 

Jesper S. Møller commented on JBRULES-3122:
-------------------------------------------

I found another place where a null is being returned from a Drools class loader, this time it is the CompositeClassLoader in knowledge-api. For the life of me, I cannot find the tests for it, but I've added a pull request for it as well.

Pull request at: https://github.com/droolsjbpm/droolsjbpm-knowledge/pull/17
                
> Classloading error with AspectJ and Drools 5.2.0.Final
> ------------------------------------------------------
>
>                 Key: JBRULES-3122
>                 URL: https://issues.jboss.org/browse/JBRULES-3122
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core
>    Affects Versions: 5.2.0.Final
>            Reporter: stevearoonie
>            Assignee: Edson Tirelli
>             Fix For: 5.3.2.Final, 5.4.0.Beta2
>
>
> NPE running Drools with AspectJ
> java.lang.NullPointerException
> at org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.parseDefinitions(ClassLoaderWeavingAdaptor.java:251)
> at org.aspectj.weaver.loadtime.DefaultWeavingContext.getDefinitions(DefaultWeavingContext.java:130)
> at org.aspectj.weaver.loadtime.ClassLoaderWeavingAdaptor.initialize(ClassLoaderWeavingAdaptor.java:161)
> at org.aspectj.weaver.loadtime.Aj$ExplicitlyInitializedClassLoaderWeavingAdaptor.initialize(Aj.java:271)
> at org.aspectj.weaver.loadtime.Aj$ExplicitlyInitializedClassLoaderWeavingAdaptor.getWeavingAdaptor(Aj.java:276)
> at org.aspectj.weaver.loadtime.Aj$WeaverContainer.getWeaver(Aj.java:254)
> at org.aspectj.weaver.loadtime.Aj.preProcess(Aj.java:90)
> at org.aspectj.weaver.loadtime.ClassPreProcessorAgentAdapter.transform(ClassPreProcessorAgentAdapter.java:54)
> at sun.instrument.TransformerManager.transform(TransformerManager.java:169)
> at sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:365)
> at java.lang.ClassLoader.defineClass1(Native Method)
> at java.lang.ClassLoader.defineClassCond(ClassLoader.java:632)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
> at org.drools.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:570)
> at org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:258)
> at org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:241)
> at org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:88)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
> at org.drools.rule.JavaDialectRuntimeData.wire(JavaDialectRuntimeData.java:405)
> at org.drools.rule.JavaDialectRuntimeData.wire(JavaDialectRuntimeData.java:396)
> at org.drools.rule.JavaDialectRuntimeData.onBeforeExecute(JavaDialectRuntimeData.java:237)
> at org.drools.rule.DialectRuntimeRegistry.onBeforeExecute(DialectRuntimeRegistry.java:132)
> at org.drools.compiler.PackageBuilder.reloadAll(PackageBuilder.java:796)
> at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:751)
> at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:360)
> at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:538)
> at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
> at au.com.promedicus.rules.KnowledgeBaseBuilder.addPackagesFromList(KnowledgeBaseBuilder.java:108)
> at au.com.promedicus.rules.KnowledgeBaseBuilder.build(KnowledgeBaseBuilder.java:69)
> at au.com.promedicus.rules.KnowledgeBaseBuilder.build(KnowledgeBaseBuilder.java:54)
> I have traced the problem to org.drools.rule.JavaDialectRuntimeData$PackageClassLoader.getResources. This returns null whereas AspectJ expects it to at least return an empty enumeration - hence the NPE.

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