ScriptTask out:println causes Stack size error (sic!)

[tse]

Having process variable orderId (String) and adding scriptTask (groovy)

out:println "test" + orderId
out:println "test2"‍‍

causes:

Caused by: java.lang.VerifyError: (class: Script14, method: run signature: ()Ljava/lang/Object;) Stack size too large
   at java.lang.Class.getDeclaredConstructors0(Native Method)
   at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389)
   at java.lang.Class.getConstructor0(Class.java:2699)
   at java.lang.Class.newInstance0(Class.java:326)
   at java.lang.Class.newInstance(Class.java:308)
   at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:259)
   at org.codehaus.groovy.jsr223.GroovyScriptEngineImpl.eval(GroovyScriptEngineImpl.java:111)
   at javax.script.AbstractScriptEngine.eval(AbstractScriptEngine.java:216)
   at org.activiti.engine.impl.scripting.ScriptingEngines.evaluate(ScriptingEngines.java:69)
   at org.activiti.engine.impl.bpmn.behavior.ScriptTaskActivityBehavior.execute(ScriptTaskActivityBehavior.java:51)
   at org.activiti.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:44)
   at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:85)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:535)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:530)
   at org.activiti.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerStart.eventNotificationsCompleted(AtomicOperationTransitionNotifyListenerStart.java:52)
   at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:56)
   at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:85)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:535)
   at org.activiti.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:530)
   at org.activiti.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:49)
   at org.activiti.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:85)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

whole flow:

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/">
  <process id="testProcess" name="TEst process" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <endEvent id="endevent1" name="End"></endEvent>
    <scriptTask id="scripttask1" name="Script Task" scriptFormat="groovy">
      <script>out:println "test" + orderId
out:println "test2"</script>
    </scriptTask>
    <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="scripttask1"></sequenceFlow>
    <sequenceFlow id="flow2" sourceRef="scripttask1" targetRef="endevent1"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_testProcess">
    <bpmndi:BPMNPlane bpmnElement="testProcess" id="BPMNPlane_testProcess">
      <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="320.0" y="37.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
        <omgdc:Bounds height="35.0" width="35.0" x="870.0" y="37.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="scripttask1" id="BPMNShape_scripttask1">
        <omgdc:Bounds height="55.0" width="105.0" x="580.0" y="27.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
        <omgdi:waypoint x="355.0" y="54.0"></omgdi:waypoint>
        <omgdi:waypoint x="580.0" y="54.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
        <omgdi:waypoint x="685.0" y="54.0"></omgdi:waypoint>
        <omgdi:waypoint x="870.0" y="54.0"></omgdi:waypoint>
      </bpmndi:BPMNEdge>
    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>
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[frederikherema1]

Can you create a failing unit-test for this error?

[tse]

JUnit test is ready, however, it seems i have no rights to upload attachments

[frederikherema1]

You can use any public file-charing app for that e.g.. dropbox, that's perfectly fine

[tse]

Not that easy with my company's very restrictive internet-access-policy.

Here is the unit test:
https://www.dropbox.com/s/26x7m98zpodzv98/groovy-activiti-unit-test.zip

[frederikherema1]

Really strange bug, don't really see what the issue is here… The problem is that we just use the Scripting capabilities of the jdk, adding in Bindings to resolve variable-instances, but nothing that could explain an excessive stack. It seems to be related to the println-statement or am I mistaken?

[tse]

String concatenated with process variables seems to be the issue,

These work great:

out:smileytongue:rintln "test1"
out:smileytongue:rintln processVariable1
out:smileytongue:rintln "test2"

out:smileytongue:rintln "test"
out:smileytongue:rintln processVariable1
out:smileytongue:rintln "test" + processVariable1
out:smileytongue:rintln "test" + processVariable1

These fail with stack error:

out:smileytongue:rintln "test"
out:smileytongue:rintln processVariable1
out:smileytongue:rintln "test" + processVariable1
out:smileytongue:rintln processVariable1

out:smileytongue:rintln "test" + processVariable1
out:smileytongue:rintln processVariable1

Rather hard to find any pattern…

[frederikherema1]

Are you using this inside of Grails? What version of groovy are you using?

[tse]

I believe everything is in the pom.
If you ask about my project, I don't use grails.
In both the unit test and the project I use:

      <groupId>org.codehaus.groovy</groupId>
      <artifactId>groovy</artifactId>
      <version>1.7.5</version>


[jbarrez]

I've honestly got no clue about this one … maybe try with a more recent version of groovy, see http://mvnrepository.com/artifact/org.codehaus.groovy/groovy-all/2.0.6