---------- Forwarded message ----------
From: Steven Williams <stevearoonie@gmail.com>
Date: 2011/7/6
Subject: Re: [rules-users] Classloading error with AspectJ and Drools 5.2.0.Final
To: Rules Users List <rules-users@lists.jboss.org>

Clarification to this - it does also happen when we run our server. So this is preventing us from upgrading to 5.2

My guess is that getResources should return getParent().getResources() rather than null.

regards

Steve

On Wed, Jul 6, 2011 at 1:42 PM, Steven Williams <stevearoonie@gmail.com> wrote:

Hi,

I have just upgraded to Drools 5.2.0.Final and am getting a weird error when running unit tests.

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. Interestingly the problem does not occur when running our server, however we can't upgrade unless our unit tests pass and we can't easily turn off aspectj for these.

regards

Steve

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