[rules-users] drools flow package issue
Kris Verlaenen
Kris.Verlaenen at cs.kuleuven.be
Mon Nov 23 12:41:42 EST 2009
I believe there used to be an issue with action class generation (where
there could be a clash between actions of different processes), but this
was fixed quite some time ago. Could you verify whether the problem
still exists on the latest snapshot releases?
http://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/
Kris
Quoting "nesta.fdb" <nesta.fdb at 163.com>:
> Hi,
>
> As my understanding, drools will generate java classes for action of
> rule flow. It seems that if there are two rule flows, and they are in
> one package, drools thinks that it's dirty to load generated java
> class of second package, so drools will reload it.
>
> Thanks very much.
>
> Full stack trace:
> Exception in thread "main" java.lang.NoSuchMethodError:
>
sample.Process_sample_0.action0(Lorg/drools/spi/KnowledgeHelper;Lorg/drools/spi/ProcessContext;)V
> at
>
sample.Process_sample_0Action0Invoker.execute(Process_sample_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: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.workflow.instance.node.SubProcessNodeInstance.internalTrigger(SubProcessNodeInstance.java:83)
> 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.JoinInstance.triggerCompleted(JoinInstance.java:152)
> at
>
org.drools.workflow.instance.node.JoinInstance.internalTrigger(JoinInstance.java:52)
> 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.ActionNodeInstance.triggerCompleted(ActionNodeInstance.java:62)
> at
>
org.drools.workflow.instance.node.ActionNodeInstance.internalTrigger(ActionNodeInstance.java:58)
> 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.node.SplitInstance.internalTrigger(SplitInstance.java:74)
> 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.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1604)
> at
>
org.drools.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:267)
> at
> drools.ruleflow.xiayu.XiaYuSubflowTest.main(XiaYuSubflowTest.java:32)
>
>
>
>
>
> ÔÚ2009-11-23£¬"Kris Verlaenen" <Kris.Verlaenen at cs.kuleuven.be> дµÀ£º
> >What do you mean by "NoSuchMethod error is thrown" ? Could you
> provide
> >the full stack trace? In theory, you should simply be able to call
> any
> >other process, whether it is in the same package or not.
> >
> >Kris
> >
> >Quoting "nesta.fdb" <nesta.fdb at 163.com>:
> >
> >> Drools version: 5.0.1
> >> I defined two flows, one is main flow and the other is sub flow.
> >> These two flows have same package name, and are built and added
> into
> >> one knowledge base.
> >> When I start the main flow process, the NoSuchMethod error is
> thrown
> >> out.
> >>
> >> I also test with two unrelated flows, and I can't get correct
> result.
> >>
> >>
> >> So my question is that whether there is the constraint which two
> >> flows must not have same package name?
> >>
> >> main.rf
> >> <?xml version="1.0" encoding="UTF-8"?>
> >> <process xmlns="http://drools.org/drools-5.0/process"
> >> xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
> >> xs:schemaLocation="http://drools.org/drools-5.0/process
> >> drools-processes-5.0.xsd"
> >> type="RuleFlow" name="flow" id="process_plan"
> >> package-name="sample" version="" >
> >>
> >> <header>
> >> <variables>
> >> <variable name="v1" >
> >> <type
> >> name="org.drools.process.core.datatype.impl.type.BooleanDataType"
> />
> >> <value>false</value>
> >> </variable>
> >> </variables>
> >> </header>
> >>
> >> <nodes>
> >> <start id="1" name="Start" x="195" y="15" width="30"
> height="30"
> >> />
> >> <split id="2" name="Split" x="185" y="70" width="40"
> height="40"
> >> type="2" >
> >> <constraints>
> >> <constraint toNodeId="10" toType="DROOLS_DEFAULT" name="a"
> >> priority="1" type="code" dialect="java" >return v1;</constraint>
> >> <constraint toNodeId="11" toType="DROOLS_DEFAULT" name="b"
> >> priority="1" type="code" dialect="java" >return !v1;</constraint>
> >> </constraints>
> >> </split>
> >> <join id="5" name="Join" x="185" y="260" width="40"
> height="40"
> >> type="2" />
> >> <actionNode id="7" name="test" x="155" y="320" width="100"
> >> height="80" >
> >> <action type="expression" dialect="java"
> >> >System.out.println("Action Test");</action>
> >> </actionNode>
> >> <end id="8" name="End" x="191" y="436" width="28" height="28"
> />
> >> <subProcess id="9" name="SubProcess" x="312" y="292"
> width="96"
> >> height="76" processId="com.sample.subflow" independent="false" >
> >> </subProcess>
> >> <actionNode id="10" name="a" x="75" y="151" width="80"
> >> height="40" >
> >> <action type="expression" dialect="java"
> >> >System.out.println("a");</action>
> >> </actionNode>
> >> <actionNode id="11" name="b" x="287" y="153" width="80"
> >> height="40" >
> >> <action type="expression" dialect="java"
> >> >System.out.println("b");</action>
> >> </actionNode>
> >> </nodes>
> >>
> >> <connections>
> >> <connection from="1" to="2" />
> >> <connection from="10" to="5" />
> >> <connection from="11" to="5" />
> >> <connection from="9" to="7" />
> >> <connection from="7" to="8" />
> >> <connection from="5" to="9" />
> >> <connection from="2" to="10" />
> >> <connection from="2" to="11" />
> >> </connections>
> >>
> >> </process>
> >>
> >> sub.rf
> >> <?xml version="1.0" encoding="UTF-8"?>
> >> <process xmlns="http://drools.org/drools-5.0/process"
> >> xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"
> >> xs:schemaLocation="http://drools.org/drools-5.0/process
> >> drools-processes-5.0.xsd"
> >> type="RuleFlow" name="subflow" id="com.sample.subflow"
> >> package-name="sample" version="" >
> >>
> >> <header>
> >> </header>
> >>
> >> <nodes>
> >> <start id="1" name="Start" x="29" y="76" width="30"
> height="30"
> >> />
> >> <actionNode id="2" name="Action" x="134" y="51" width="100"
> >> height="80" >
> >> <action type="expression" dialect="java"
> >> >System.out.println("This is test subflow");</action>
> >> </actionNode>
> >> <end id="3" name="End" x="309" y="77" width="28" height="28"
> />
> >> <actionNode id="4" name="Action" x="240" y="210" width="100"
> >> height="80" >
> >> <action type="expression" dialect="java"
> >> >System.out.println("This is test 2222");</action>
> >> </actionNode>
> >> </nodes>
> >>
> >> <connections>
> >> <connection from="1" to="2" />
> >> <connection from="4" to="3" />
> >> <connection from="2" to="4" />
> >> </connections>
> >>
> >> </process>
> >>
> >> Test codes:
> >> public class XiaYuSubflowTest {
> >>
> >> public static void main(String[] args) {
> >> KnowledgeBuilder builder =
> >> KnowledgeBuilderFactory.newKnowledgeBuilder();
> >>
> builder.add(ResourceFactory.newClassPathResource("main.rf"),
> >> ResourceType.DRF);
> >>
> builder.add(ResourceFactory.newClassPathResource("sub.rf"),
> >> ResourceType.DRF);
> >> if (builder.hasErrors()) {
> >> System.out.println(builder.getErrors());
> >> }
> >> KnowledgeBase kbase =
> >> KnowledgeBaseFactory.newKnowledgeBase();
> >>
> kbase.addKnowledgePackages(builder.getKnowledgePackages());
> >> StatefulKnowledgeSession sks =
> >> kbase.newStatefulKnowledgeSession();
> >> sks.startProcess("process_plan");
> >> sks.dispose();
> >> }
> >> }
> >>
> >
> >
> >
> >
> >Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
>
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