[rules-users] Drools in jBPM

[fraction8]

I have problem in using drools in simple jBPM application. Every thing works
fine while it is runs under JUNIT but when I export it to jBPM i got
exception

org.jboss.resteasy.spi.UnhandledException:
org.drools.RuntimeDroolsException: Unable to resolve class
'myclass.jbpm.vrk.Claim'

org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:319)

org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:230)

org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:206)

org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:360)

org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:173)

org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:93)

org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:68)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59)

root cause

org.drools.RuntimeDroolsException: Unable to resolve class
'myclass.jbpm.vrk.Claim'

org.drools.base.ClassFieldAccessorCache.getClass(ClassFieldAccessorCache.java:269)

org.drools.base.ClassFieldAccessorCache.getReadAcessor(ClassFieldAccessorCache.java:241)

org.drools.base.ClassFieldAccessorStore.wire(ClassFieldAccessorStore.java:379)

org.drools.base.ClassFieldAccessorStore.merge(ClassFieldAccessorStore.java:270)
	org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:466)
	org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:379)

org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:121)
	myclass.jbpm.drools.DroolsRulesManager.runDrlRule(Unknown Source)


My drl is very simple:
import myclass.jbpm.vrk.Claim;

rule "Rule 01"   
    when
        $claim : Claim( $date : date, $elements : elements, $simpleClaim :
simpleClaim )
        eval( $elements <= 10 )
    then
    	$claim.setSimpleClaim( true );
        System.out.println("It's a simple claim!: " + $date + ", elements: "
+ $elements + ", simple: " + $simpleClaim); 
end

The only way to solve it is to write new ClassLoader and pass it to
KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null,
myNewClassLoader);
, or this error is caused by something else?
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