hong lu [http://community.jboss.org/people/luhong] created the discussion "problem with MVEL:Possible incorrect version of ASM present (3.0 required). Disabling JIT compiler. Reflective Optimizer will be used." To view the discussion, visit: http://community.jboss.org/message/645632#645632 -------------------------------------------------------------- hi, I use bpmn2 eclipse plugin create a process flow and program a test. I get below output messages: (null: 2, 307): cvc-elt.1: Cannot find the declaration of element 'bpmn2:definitions'. (null: 33, 63): cvc-elt.4.2: Cannot resolve 'dc:Point' to a type definition for element 'di:waypoint'. (null: 34, 63): cvc-elt.4.2: Cannot resolve 'dc:Point' to a type definition for element 'di:waypoint'. (null: 37, 63): cvc-elt.4.2: Cannot resolve 'dc:Point' to a type definition for element 'di:waypoint'. (null: 38, 63): cvc-elt.4.2: Cannot resolve 'dc:Point' to a type definition for element 'di:waypoint'. java.lang.NullPointerException at org.mvel2.optimizers.OptimizerFactory.<clinit>(OptimizerFactory.java:45) at org.drools.base.mvel.MVELCompilationUnit.compile(MVELCompilationUnit.java:419) at org.drools.base.mvel.MVELCompilationUnit.getCompiledExpression(MVELCompilationUnit.java:243) at org.jbpm.process.instance.impl.MVELAction.compile(MVELAction.java:70) at org.jbpm.process.builder.dialect.mvel.MVELActionBuilder.build(MVELActionBuilder.java:131) at org.jbpm.process.builder.ActionNodeBuilder.build(ActionNodeBuilder.java:25) at org.jbpm.compiler.ProcessBuilderImpl.processNodes(ProcessBuilderImpl.java:213) at org.jbpm.compiler.ProcessBuilderImpl.buildNodes(ProcessBuilderImpl.java:199) at org.jbpm.compiler.ProcessBuilderImpl.buildProcess(ProcessBuilderImpl.java:163) at org.jbpm.compiler.ProcessBuilderImpl.addProcessFromXml(ProcessBuilderImpl.java:252) at org.drools.compiler.PackageBuilder.addProcessFromXml(PackageBuilder.java:564) at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:608) at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:37) at com.test.workflow.BPMN2Test.main(BPMN2Test.java:14) [MVEL] Notice: Possible incorrect version of ASM present (3.0 required).  Disabling JIT compiler.  Reflective Optimizer will be used. hello world Could anybody tell me how to resolve above NullPointerException. I don't find any solution from google's results. and where I can find an full guider of how to use the BPMN2 eclipse plugin, thanks. Forgive me for my bad english.Thanks very much. bpmn file: <?xml version="1.0" encoding="UTF-8"?> <bpmn2:definitions xmlns:xsi=" http://www.w3.org/2001/XMLSchema-instance http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmn2=" http://www.omg.org/spec/BPMN/20100524/MODEL http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi=" http://www.omg.org/spec/BPMN/20100524/DI http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc=" http://www.omg.org/spec/DD/20100524/DC http://www.omg.org/spec/DD/20100524/DC" xmlns:di=" http://www.omg.org/spec/DD/20100524/DI http://www.omg.org/spec/DD/20100524/DI" id="Definitions_1">   <bpmn2:collaboration id="Collaboration_1">     <bpmn2:participant id="Participant_1" name="Internal" processRef="com.test.login"/>   </bpmn2:collaboration>   <bpmn2:process id="com.test.login" name="loginProcess" isClosed="true">     <bpmn2:startEvent id="StartEvent_1" name="Start">       <bpmn2:outgoing>SequenceFlow_3</bpmn2:outgoing>     </bpmn2:startEvent>     <bpmn2:endEvent id="EndEvent_1" name="End">       <bpmn2:incoming>SequenceFlow_6</bpmn2:incoming>     </bpmn2:endEvent>     <bpmn2:sequenceFlow id="SequenceFlow_3" name="" sourceRef="StartEvent_1" targetRef="ScriptTask_1"/>     <bpmn2:scriptTask id="ScriptTask_1" name="Script Task" scriptFormat="">       <bpmn2:incoming>SequenceFlow_3</bpmn2:incoming>       <bpmn2:outgoing>SequenceFlow_6</bpmn2:outgoing>       <bpmn2:script>System.out.println(&quot;hello world&quot;);</bpmn2:script>     </bpmn2:scriptTask>     <bpmn2:sequenceFlow id="SequenceFlow_6" name="" sourceRef="ScriptTask_1" targetRef="EndEvent_1"/>   </bpmn2:process>   <bpmndi:BPMNDiagram id="_L0Uu0DtuEeGfR6QZoDLdng">     <bpmndi:BPMNPlane id="_L0Uu0TtuEeGfR6QZoDLdng" bpmnElement="com.test.login">       <bpmndi:BPMNShape id="BPMNShape_StartEvent_1" bpmnElement="StartEvent_1">         <dc:Bounds height="51.0" width="36.0" x="90.0" y="170.0"/>       </bpmndi:BPMNShape>       <bpmndi:BPMNShape id="BPMNShape_EndEvent_1" bpmnElement="EndEvent_1">         <dc:Bounds height="51.0" width="36.0" x="450.0" y="170.0"/>       </bpmndi:BPMNShape>       <bpmndi:BPMNShape id="BPMNShape_ScriptTask_1" bpmnElement="ScriptTask_1">         <dc:Bounds height="50.0" width="110.0" x="230.0" y="163.0"/>       </bpmndi:BPMNShape>       <bpmndi:BPMNEdge id="BPMNEdge_SequenceFlow_3" bpmnElement="SequenceFlow_3" sourceElement="BPMNShape_StartEvent_1" targetElement="BPMNShape_ScriptTask_1">         <di:waypoint xsi:type="dc:Point" x="126.0" y="188.0"/>         <di:waypoint xsi:type="dc:Point" x="230.0" y="188.0"/>       </bpmndi:BPMNEdge>       <bpmndi:BPMNEdge id="BPMNEdge_SequenceFlow_4" bpmnElement="SequenceFlow_6" sourceElement="BPMNShape_ScriptTask_1" targetElement="BPMNShape_EndEvent_1">         <di:waypoint xsi:type="dc:Point" x="340.0" y="188.0"/>         <di:waypoint xsi:type="dc:Point" x="450.0" y="188.0"/>       </bpmndi:BPMNEdge>     </bpmndi:BPMNPlane>   </bpmndi:BPMNDiagram> </bpmn2:definitions> java source: package com.test.workflow; import org.drools.KnowledgeBase; import org.drools.builder.KnowledgeBuilder; import org.drools.builder.KnowledgeBuilderFactory; import org.drools.builder.ResourceType; import org.drools.io.ResourceFactory; import org.drools.runtime.StatefulKnowledgeSession; import org.drools.runtime.process.ProcessInstance; public class BPMN2Test { public static void main(String[] args) {   KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();   kbuilder.add(ResourceFactory.newClassPathResource("com/test/workflow/flow/loginProcess.bpmn"),     ResourceType.BPMN2);   KnowledgeBase kbase = kbuilder.newKnowledgeBase();   StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();   ProcessInstance processInstance = ksession.startProcess("com.test.login"); } } -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/645632#645632] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]