[rules-users] Process variables in split/action nodes

[Renato Herebia]

Kris, thanks for your answer...

I've tried to access the variable in a split constraint (return count != 1;)
with mvel dialect and I got this trace in runtime:

Uncaught exception on client
java.lang.RuntimeException: unable to execute ReturnValueEvaluator
    at
org.drools.workflow.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:124)
    at
org.drools.workflow.instance.node.SplitInstance.internalTrigger(SplitInstance.java:62)
    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.impl.ExtendedNodeInstanceImpl.triggerCompleted(ExtendedNodeInstanceImpl.java:37)
    at
org.drools.workflow.instance.node.EventBasedNodeInstance.triggerCompleted(EventBasedNodeInstance.java:96)
    at
org.drools.workflow.instance.node.EventBasedNodeInstance.triggerCompleted(EventBasedNodeInstance.java:77)
    at
org.drools.workflow.instance.node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java:192)
    at
org.drools.workflow.instance.node.HumanTaskNodeInstance.triggerCompleted(HumanTaskNodeInstance.java:74)
    at
org.drools.workflow.instance.node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java:246)
    at
org.drools.workflow.instance.node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:222)
    at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:258)
    at
org.drools.process.instance.impl.DefaultWorkItemManager.completeWorkItem(DefaultWorkItemManager.java:96)
    at
org.drools.process.workitem.wsht.WSHumanTaskHandler$GetCompletedTaskResponseHandler.execute(WSHumanTaskHandler.java:282)
    at
org.drools.task.service.TaskClientHandler.messageReceived(TaskClientHandler.java:67)
    at
org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:752)
    at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
    at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
    at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
    at
org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:379)
    at
org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:173)
    at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
    at
org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:49)
    at
org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:832)
    at
org.apache.mina.core.filterchain.DefaultIoFilterChain$HeadFilter.messageReceived(DefaultIoFilterChain.java:616)
    at
org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:414)
    at
org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:408)
    at
org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:578)
    at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:540)
    at
org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:532)
    at
org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:58)
    at
org.apache.mina.core.polling.AbstractPollingIoProcessor$Worker.run(AbstractPollingIoProcessor.java:857)
    at
org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
    at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to
java.lang.String
    at
org.mvel2.math.MathProcessor.getInternalNumberFromType(MathProcessor.java:555)
    at org.mvel2.math.MathProcessor._doOperations(MathProcessor.java:155)
    at org.mvel2.math.MathProcessor.doOperations(MathProcessor.java:79)
    at
org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:102)
    at
org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:37)
    at
org.mvel2.ast.ReturnNode.getReducedValueAccelerated(ReturnNode.java:45)
    at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
    at
org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:107)
    at org.mvel2.MVEL.executeExpression(MVEL.java:978)
    at
org.drools.base.mvel.MVELReturnValueEvaluator.evaluate(MVELReturnValueEvaluator.java:110)
    at
org.drools.workflow.instance.impl.ReturnValueConstraintEvaluator.evaluate(ReturnValueConstraintEvaluator.java:121)
    ... 36 more

With Java dialect I got a problem when I add the rule flow to the
KnowledgeBuilderFactory:

java.lang.RuntimeException: Process Compilation error :
org.drools.lang.descr.ProcessDescr at 69695f
    com/sample/Process_com_sample_0.java (9:387) : Incompatible operand
types String and int

    at com.sample.ProcessTest.readKnowledgeBase(ProcessTest.java:81)
    at com.sample.ProcessTest.main(ProcessTest.java:30)


Using action node, I could get the variable process with mvel dialect in
action just calling:

System.out.println("The counting is: " + count);

If I use Java dialect with the same System.out, I got this problem after add
the rule flow to the KnowledgeBuilderFactory:

java.lang.RuntimeException: unable to execute Action
    at
org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:56)
    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.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:272)
    at com.sample.ProcessTest.main(ProcessTest.java:42)
Caused by: java.lang.ClassCastException: java.lang.Integer cannot be cast to
java.lang.String
    at
com.sample.Process_com_sample_0Action0Invoker.execute(Process_com_sample_0Action0Invoker.java:18)
    at
org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:54)
    ... 12 more


In this scenario, my doubts are:
- It's necessary any configuration for the access in action/split nodes to
process variables?
- How can I do that?


Thanks in advance.

-- 
Renato Herebia
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