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

[Mark Proctor]

javadoc says:
"An enumeration of |URL 
<eclipse-javadoc:%E2%98%82=drools-api/C:%5C/java%5C/jdk1.6.0_18%5C/jre%5C/lib%5C/rt.jar%3Cjava.lang%28ClassLoader.class%E2%98%83ClassLoader%7EgetResources%7ELjava.lang.String;%E2%98%82java.net.URL>| 
objects for the resource. If no resources could be found, the 
enumeration will be empty. "

So that seems a reasonable request. I'll get it updated.

Mark
On 07/07/2011 12:35, Wolfgang Laun wrote:
> Nobody from the "core team" acknowledged this as justified - it looks 
> reasonable to me.
> -W
>
> ---------- Forwarded message ----------
> From: *Steven Williams* <stevearoonie at gmail.com 
> <mailto:stevearoonie at 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 at lists.jboss.org 
> <mailto:rules-users at 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 at gmail.com <mailto:stevearoonie at 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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>
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