[rules-users] java.lang.LinkageError, but only sometimes

[kennywest]

Dear list,

We have an application (A) deployed on JBoss 7.1.1 accepting commands (CQRS,
but only C and Q :) ). A console application (B) is sending a large volume
of commands to create entities in A. Entities in A are validated by Drools
(plain drl files, configured in spring using drools-spring). Most of the
time this works just fine. But sometimes, we get the following exception:

java.lang.LinkageError: loader (instance of 
org/drools/rule/JavaDialectRuntimeData$PackageClassLoader): attempted 
duplicate class definition for name:
"a/b/c/Rule_person_unique___name_656ee3db19d34e689d95e2d6b2be67b6"
	at java.lang.ClassLoader.defineClass1(Native Method) [rt.jar:1.6.0_30]
	at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
[rt.jar:1.6.0_30]
	at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
[rt.jar:1.6.0_30]
	at
org.drools.rule.JavaDialectRuntimeData$PackageClassLoader.fastFindClass(JavaDialectRuntimeData.java:615)
[drools-core-5.4.0.Final.jar:5.4.0.Final]
	at
org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:254)
[knowledge-api-5.4.0.Final.jar:5.4.0.Final]
	at
org.drools.util.CompositeClassLoader$CachingLoader.load(CompositeClassLoader.java:237)
[knowledge-api-5.4.0.Final.jar:5.4.0.Final]
	at
org.drools.util.CompositeClassLoader.loadClass(CompositeClassLoader.java:88)
[knowledge-api-5.4.0.Final.jar:5.4.0.Final]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:295) [rt.jar:1.6.0_30]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:247) [rt.jar:1.6.0_30]
	at
a.b.c.Rule_gg___unique___name_656ee3db19d34e689d95e2d6b2be67b6Eval0InvokerGenerated.evaluate(Unknown
Source)
	at
a.b.c.Rule_gg___unique___name_656ee3db19d34e689d95e2d6b2be67b6Eval0Invoker.evaluate(Unknown
Source)
	at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:114)
[drools-core-5.4.0.Final.jar:5.4.0.Final]

Any idea where this is coming from or what's causing this.

We are using:
- JBoss 7.1.1
- drools 5.4.0.Final
- jdk 1.6u30
- Windows 7 64 bit


regards,

Kenneth



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