您好我在我的应用程序中使用Activiti框架来管理工作流程。我已经为演示目的创建了一个非常基本的流程定义，它完美地运行。 但是当我在流程定义中包含条件表达式获取上述异常时，我得到了上述错误。 以下是流程定义
<definitions id="definitions"
targetNamespace="http://activiti.org/bpmn20"
xmlns:activiti="http://activiti.org/bpmn"
xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL">
<process id="pms" name="Monthly financial report reminder process">
<startEvent id="theStart" />
<sequenceFlow id='flow1' sourceRef='theStart' targetRef='engORpro' />
<userTask id="initialization" name="prepare PO and shedule date" >
<documentation>
PO details and shedule milestones
</documentation>
<potentialOwner>
<resourceAssignmentExpression>
<formalExpression>initialization</formalExpression>
</resourceAssignmentExpression>
</potentialOwner>
</userTask>
<sequenceFlow id='engORpro' sourceRef='engORpro' targetRef='exclusiveGw' />
<exclusiveGateway id="exclusiveGw" name="Exclusive Gateway" />
<sequenceFlow id='flow2' sourceRef='exclusiveGw' targetRef='engineering' >
<conditionExpression xsi:type="tFormalExpression">${engineering==false}</conditionExpression>
</sequenceFlow>
<sequenceFlow id='flow11' sourceRef='exclusiveGw' targetRef='procurement' >
<conditionExpression xsi:type="tFormalExpression">${engingeering==true}</conditionExpression>
</sequenceFlow>
<userTask id="engineering" name="prepare BOQ Rule of Credit and plan dates" >
<documentation>
prepare BOQ Rule of Credit and plan dates
</documentation>
<potentialOwner>
<resourceAssignmentExpression>
<formalExpression>engineering</formalExpression>
</resourceAssignmentExpression>
</potentialOwner>
</userTask>
<sequenceFlow id='flow3' sourceRef='engineering' targetRef='procurement' />
<userTask id="procurement" name="obtain raw material" >
<documentation>
prepare current meterial status and calculate Rule of Credit
</documentation>
<potentialOwner>
<resourceAssignmentExpression>
<formalExpression>procurement</formalExpression>
</resourceAssignmentExpression>
</potentialOwner>
</userTask>
<sequenceFlow id='flow4' sourceRef='procurement' targetRef='construction' />
<userTask id="construction" name="construction of machine" >
<documentation>
plan man hour and set actual delivery dates
</documentation>
<potentialOwner>
<resourceAssignmentExpression>
<formalExpression>construction</formalExpression>
</resourceAssignmentExpression>
</potentialOwner>
</userTask>
<sequenceFlow id='flow5' sourceRef='construction' targetRef='finalHandover' />
<userTask id="finalHandover" name="Final Handover" >
<documentation>
prepare current meterial status and calculate Rule of Credit
</documentation>
<potentialOwner>
<resourceAssignmentExpression>
<formalExpression>management</formalExpression>
</resourceAssignmentExpression>
</potentialOwner>
</userTask>
<sequenceFlow id='flow6' sourceRef='finalHandover' targetRef='theEnd' />
<endEvent id="theEnd" />
</process>
当我运行这个时，我得到以下异常
Exception in thread "main" java.lang.ExceptionInInitializerError
at test.Test.main(Test.java:29)
Caused by: org.activiti.engine.ActivitiException: Error parsing XML
at org.activiti.engine.impl.bpmn.parser.BpmnParse.execute(BpmnParse.java:195)
at org.activiti.engine.impl.bpmn.deployer.BpmnDeployer.deploy(BpmnDeployer.java:86)
at org.activiti.engine.impl.persistence.deploy.DeploymentManager.deploy(DeploymentManager.java:42)
at org.activiti.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:68)
at org.activiti.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:33)
at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:61)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:37)
at org.activiti.engine.impl.RepositoryServiceImpl.deploy(RepositoryServiceImpl.java:74)
at org.activiti.engine.impl.repository.DeploymentBuilderImpl.deploy(DeploymentBuilderImpl.java:134)
at util.ProcessUtil.<clinit>(ProcessUtil.java:23)
... 1 more
Caused by: java.lang.RuntimeException: Could not validate XML with BPMN 2.0 XSD
at org.activiti.bpmn.converter.BpmnXMLConverter.convertToBpmnModel(BpmnXMLConverter.java:230)
at org.activiti.engine.impl.bpmn.parser.BpmnParse.execute(BpmnParse.java:181)
... 11 more
Caused by: org.xml.sax.SAXParseException: The prefix "xsi" for attribute "xsi:type" associated with an element type "conditionExpression" is not bound.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:318)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:334)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2756)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:647)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.jaxp.validation.StreamValidatorHelper.validate(StreamValidatorHelper.java:147)
at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorImpl.validate(ValidatorImpl.java:111)
at javax.xml.validation.Validator.validate(Validator.java:127)
at org.activiti.bpmn.converter.BpmnXMLConverter.validateModel(BpmnXMLConverter.java:164)
at org.activiti.bpmn.converter.BpmnXMLConverter.convertToBpmnModel(BpmnXMLConverter.java:219)
我还想将变量传递给流程定义来实例化它。 提前谢谢
答案 0 :(得分：2)
尝试添加
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
到definitions代码。