当我尝试启动bpmn2进程时，我得到ClassNotFoundException(Throwable).<init>(String, Throwable) line: 286。
我还没有找到解决方案。有人可以帮忙吗？
详细说明：
我的代码：
KnowledgeBase kbase = readKnowledgeBase();
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
MyTaskHandler myTaskHandler = new MyTaskHandler();
ksession.getWorkItemManager().registerWorkItemHandler("myservice",myTaskHandler);
System.out.println("Registeredddddddddddddd");
***ksession.startProcess("SingleNode_Process");***
在调试了kie和drools的源代码库后，我从源代码中获得了这个单行方法的异常（org.drools.impl.adapters.KnowledgeRuntimeAdapter class - 6.1.0.Final version）：
public ProcessInstance startProcess(String processId) {
return new ProcessInstanceAdapter(delegate.startProcess(processId));
}
P.S。代码成功，直到注册WorkItemHandler。完整堆栈跟踪的PSB：
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner at localhost:55158
Thread [main] (Suspended)
ClassNotFoundException(Throwable).<init>(String, Throwable) line: 286
ClassNotFoundException(Exception).<init>(String, Throwable) line: not available
ClassNotFoundException(ReflectiveOperationException).<init>(String, Throwable) line: not available
ClassNotFoundException.<init>(String) line: not available
URLClassLoader$1.run() line: not available
URLClassLoader$1.run() line: not available
AccessController.doPrivileged(PrivilegedExceptionAction<T>, AccessControlContext) line: not available [native method]
Launcher$ExtClassLoader(URLClassLoader).findClass(String) line: not available
Launcher$ExtClassLoader(ClassLoader).loadClass(String, boolean) line: not available
Launcher$AppClassLoader(ClassLoader).loadClass(String, boolean) line: not available
Launcher$AppClassLoader.loadClass(String, boolean) line: not available
Launcher$AppClassLoader(ClassLoader).loadClass(String) line: not available
StatefulKnowledgeSessionAdapter(KnowledgeRuntimeAdapter).startProcess(String) line: 149
JbpmMigrationTest.testBPMNProcessInstance() line: 151
NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]
NativeMethodAccessorImpl.invoke(Object, Object[]) line: not available
DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: not available
Method.invoke(Object, Object...) line: not available
FrameworkMethod$1.runReflectiveCall() line: 44
FrameworkMethod$1(ReflectiveCallable).run() line: 15
FrameworkMethod.invokeExplosively(Object, Object...) line: 41
InvokeMethod.evaluate() line: 20
RunBefores.evaluate() line: 28
RunAfters.evaluate() line: 31
BlockJUnit4ClassRunner.runChild(FrameworkMethod, RunNotifier) line: 76
BlockJUnit4ClassRunner.runChild(Object, RunNotifier) line: 50
ParentRunner$3.run() line: 193
ParentRunner$1.schedule(Runnable) line: 52
BlockJUnit4ClassRunner(ParentRunner<T>).runChildren(RunNotifier) line: 191
ParentRunner<T>.access$000(ParentRunner, RunNotifier) line: 42
ParentRunner$2.evaluate() line: 184
RunBefores.evaluate() line: 28
BlockJUnit4ClassRunner(ParentRunner<T>).run(RunNotifier) line: 236
JUnit4TestClassReference(JUnit4TestReference).run(TestExecution) line: 46
TestExecution.run(ITestReference[]) line: 38
RemoteTestRunner.runTests(String[], String, TestExecution) line: 467
RemoteTestRunner.runTests(TestExecution) line: 683
RemoteTestRunner.run() line: 390
RemoteTestRunner.main(String[]) line: 197
Thread [ReaderThread] (Running)
以下是我的控制台上单元测试的输出：
Registeredddddddddddddd
org.jbpm.workflow.instance.WorkflowRuntimeException: [SingleNode_Process:1 - myservice:2] -- Could not find work item handler for Service Task
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:168)
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:354)
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:313)
at org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:66)
at org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:43)
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:162)
at org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:35)
at org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:226)
at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:363)
at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:187)
at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:169)
at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:161)
at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:156)
at org.drools.core.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:1845)
at org.drools.impl.adapters.KnowledgeRuntimeAdapter.startProcess(KnowledgeRuntimeAdapter.java:149)
at org.jbpm.migration.JbpmMigrationTest.testBPMNProcessInstance(JbpmMigrationTest.java:151)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: org.drools.core.WorkItemHandlerNotFoundException: Could not find work item handler for Service Task
at org.drools.core.process.instance.impl.DefaultWorkItemManager.internalExecuteWorkItem(DefaultWorkItemManager.java:71)
at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:133)
at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:162)
... 40 more
答案 0 :(得分：0)
你能分享整个堆栈的踪迹吗？ 没有它，就无法帮助你。您应该确保具有ID SingleNode_Process的进程位于在readKnowledgeBase（）方法中创建的KnowledgeBase中。请注意，包含该进程的文件的名称对于启动它并不重要。
HTH
答案 1 :(得分：0)
您似乎正在使用旧的jBPM5 api和jBPM6。您是否有可能以某种方式在类路径中使用旧版本的knowledge-api？
您是否可以尝试使用新的jBPM6 api？就像是： https://github.com/droolsjbpm/droolsjbpm-tools/blob/master/drools-eclipse/org.jbpm.eclipse/src/main/resources/org/jbpm/eclipse/wizard/project/ProcessJUnit-advanced.java.template