Re: [rules-users] drools flow package issue

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/tr... Kris Quoting "nesta.fdb" <nesta.fdb(a)163.com&gt;: > 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(a)cs.kuleuven.be&gt; 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(a)163.com&gt;: > > > >> 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 > Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm