Caused by: java.lang.NoClassDefFoundError: de/odysseus/el/util/SimpleResolver
    at org.jbpm.pvm.internal.script.JuelScriptEngineFactory.getScriptEngine(JuelScriptEngineFactory.java:185)
    at javax.script.ScriptEngineManager.getEngineByName(ScriptEngineManager.java:205)
    at org.jbpm.pvm.internal.script.ScriptManager.evaluate(ScriptManager.java:111)
    at org.jbpm.pvm.internal.script.ScriptManager.evaluateExpression(ScriptManager.java:90)
    at org.jbpm.pvm.internal.model.ExecutionImpl.resolveAssignmentExpression(ExecutionImpl.java:772)
    at org.jbpm.pvm.internal.model.ExecutionImpl.initializeAssignments(ExecutionImpl.java:726)
    at org.jbpm.jpdl.internal.activity.TaskActivity.execute(TaskActivity.java:95)
    at org.jbpm.jpdl.internal.activity.TaskActivity.execute(TaskActivity.java:58)
    at org.jbpm.pvm.internal.model.op.ExecuteActivity.perform(ExecuteActivity.java:60)
    at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:656)
    at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:616)
    at org.jbpm.pvm.internal.model.ExecutionImpl.start(ExecutionImpl.java:217)
    at org.jbpm.pvm.internal.cmd.StartProcessInstanceInLatestCmd.execute(StartProcessInstanceInLatestCmd.java:65)
    at org.jbpm.pvm.internal.cmd.StartProcessInstanceInLatestCmd.execute(StartProcessInstanceInLatestCmd.java:38)
    at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42)
    at org.jbpm.pvm.internal.tx.SpringCommandCallback.doInTransaction(SpringCommandCallback.java:45)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
    at org.jbpm.pvm.internal.tx.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:55)
    at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.executeInNewEnvironment(EnvironmentInterceptor.java:53)
    at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:40)
    at org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:55)
    at org.jbpm.pvm.internal.svc.ExecutionServiceImpl.startProcessInstanceByKey(ExecutionServiceImpl.java:78)
    at cn.ait.xkw.licence.service.ProcessServiceImpl.startProcessInstance(ProcessServiceImpl.java:170)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
    at $Proxy29.startProcessInstance(Unknown Source)
    at cn.ait.xkw.licence.service.LicenceProjectServiceImpl.startProcess(LicenceProjectServiceImpl.java:429)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)