[rules-users] java.lang.NoSuchMethodError on every Action node

[Kris Verlaenen]

Hi,

This indeed seems to be related to a conflict of actions.  I assume you are 
using the same knowledge builder for adding both the main and the sub 
process (as that is responsible for resolving possible conflicts)?  If so, 
could you provide a simple, standalone example that demonstrates this 
behaviour so I can take a look?

Kris

----- Original Message ----- 
From: "retoy" <reto.lamprecht at allianz-suisse.ch>
To: <rules-users at lists.jboss.org>
Sent: Monday, July 19, 2010 12:45 PM
Subject: Re: [rules-users] java.lang.NoSuchMethodError on every Action node


>
> I've been struggling with a NoSuchMethodError as well whenever I added any
> simple Action to my ruleflow:
>
> java.lang.NoSuchMethodError:
> my.package.Process_my_package_0.action0(Lorg/drools/spi/KnowledgeHelper;Ljava/lang/Object;Lorg/drools/spi/ProcessContext;)V
> at
> my.package.Process_my_package_0Action0Invoker.execute(Process_my_package_0Action0Invoker.java:21)
> at
> org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.executeAction(ExtendedNodeInstanceImpl.java:66)
> at
> org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.triggerEvent(ExtendedNodeInstanceImpl.java:45)
> at
> org.drools.workflow.instance.impl.ExtendedNodeInstanceImpl.internalTrigger(ExtendedNodeInstanceImpl.java:28)
> at
> org.drools.workflow.instance.node.EventBasedNodeInstance.internalTrigger(EventBasedNodeInstance.java:30)
> at
> org.drools.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:80)
> at
> org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
> at
> org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:141)
> at
> org.drools.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:128)
> at
> org.drools.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:49)
> at
> org.drools.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:41)
> at
> org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
> at
> org.drools.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:16)
> at
> org.drools.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:185)
> at
> org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:230)
> at
> org.drools.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1639)
> at
> org.drools.process.command.StartProcessCommand.execute(StartProcessCommand.java:46)
> at
> org.drools.process.command.StartProcessCommand.execute(StartProcessCommand.java:10)
> at
> org.drools.persistence.session.SingleSessionCommandService.execute(SingleSessionCommandService.java:229)
> at
> org.drools.process.command.impl.CommandBasedStatefulKnowledgeSession.startProcess(CommandBasedStatefulKnowledgeSession.java:163)
>
>
> In my scenario I have two ruleflows in the knowledge base. One is the
> subflow of the other one and both contain an action.
>
> To localize the cause of the problem, I only started the subflow 
> separately
> and finally found that the NoSuchMethodError does NOT occur if
> - the subprocess is added to the knowledge base AFTER the main process.
> - the two processes don't have the same package name
>
> So it seems like there is a name collision. The generated action of the
> second ruleflow seems to overwrite the generated action of the first one.
> Since both processes dont just execute the same action after that, but
> instead the action of the first process is not found, I assume this is a
> bug...
>
> The workaround is to simply use different package names.
>
> -- 
> View this message in context: 
> http://drools-java-rules-engine.46999.n3.nabble.com/java-lang-NoSuchMethodError-on-every-Action-node-tp60886p978186.html
> Sent from the Drools - User mailing list archive at Nabble.com.
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