Hi everyone.

I've been trying to use Drools for the past month, and sometimes I have problems I can't guess anymore how to solve.

This time, every action I try to insert in a ruleflow, I receive a java.lang.NoSuchMethodError. I'm even trying a really simple ruleflow with just one simple action - like System.out.println("Test"); - and all I get is a java.lang.NoSuchMethodError.

[
The stack trace:
java.lang.NoSuchMethodError: br.com.pst.packages.ruleflows.Process_br_com_pst_packages_ruleflows_0.action0(Lorg/drools/spi/KnowledgeHelper;Lorg/drools/spi/ProcessContext;)V
        at br.com.pst.packages.ruleflows.Process_br_com_pst_packages_ruleflows_0Action0Invoker.execute(Process_br_com_pst_packages_ruleflows_0Action0Invoker.java:20)
        at org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:54)
        at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:111)
        at org.drools.workflow.instance.impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:142)
        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.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1604)
        at org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:267)
        at br.com.pst.packages.ServicePackages.main(ServicePackages.java:99)
 ]

Actually, the beginning problem was with my project, with a process and subprocess. The subprocess works fine, but the main process throws a java.lang.NoSuchMethodError always on any node I put after a specific RuleFlowGroup node. Everyting used to work before, but when I begin to enlarge it, nothing seems to work anymore. And, as I told, I can't always guess the exact problem as the thrown exceptions are very generic.

Hope anyone could help me!

Thanks a lot


ANA FLÁVIA FONSECA DOS SANTOS
Analista de Desenvolvimento de Software

PST Eletrônica S/A
Phone: +55 19 3787 6379
aflavia@pst.com.br
www.pst.com.br
www.positron.com.br