Re: [rules-users] Classloading error with AspectJ and Drools 5.2.0.Final

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