[jboss-user] [jBPM] - NullPointerException when try to getProcessInstance

[liliana.iovanovici]

liliana.iovanovici [https://community.jboss.org/people/liliana.iovanovici] created the discussion

"NullPointerException when try to getProcessInstance"

To view the discussion, visit: https://community.jboss.org/message/735403#735403

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Hello,

I am trying to start a process and after a while to send a signal to process.
I got the an exception: 

java.lang.NullPointerException
    at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:89)
    at org.jbpm.persistence.processinstance.ProcessInstanceInfo.getProcessInstance(ProcessInstanceInfo.java:128)
    at org.jbpm.persistence.processinstance.JPAProcessInstanceManager.getProcessInstance(JPAProcessInstanceManager.java:82)
    at org.jbpm.process.instance.ProcessRuntimeImpl.getProcessInstance(ProcessRuntimeImpl.java:204)
    at org.drools.common.AbstractWorkingMemory.getProcessInstance(AbstractWorkingMemory.java:1097)
    at org.drools.impl.StatefulKnowledgeSessionImpl.getProcessInstance(StatefulKnowledgeSessionImpl.java:283)
    at org.drools.command.runtime.process.SignalEventCommand.execute(SignalEventCommand.java:93)
    at org.drools.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)
    at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:345)
    at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.signalEvent(CommandBasedStatefulKnowledgeSession.java:210)
    at com.aciworldwide.aps.adf.core.adapter.orchestration.jbpm5.JbpmApiHelperLocalImpl.signalProcess(JbpmApiHelperLocalImpl.java:86)
    at com.aciworldwide.aps.adf.core.adapter.orchestration.jbpm5.OrchestrationAdapterJbpmImpl.completeTask(OrchestrationAdapterJbpmImpl.java:203)
    at com.aciworldwide.aps.adf.core.service.orchestration.HumanTaskServiceImpl.completeTask(HumanTaskServiceImpl.java:103)
    at com.aciworldwide.aps.adf.core.service.orchestration.OrchestrationServiceImpl.completeTask(OrchestrationServiceImpl.java:170)
    at com.dev.test.biz.payment.PaymentServiceImpl.completeSubmitPaymentTask(PaymentServiceImpl.java:259)
    at com.dev.test.biz.payment.PaymentServiceImpl.submitPaymentTask(PaymentServiceImpl.java:232)
    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:309)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    at $Proxy41.submitPaymentTask(Unknown Source)
    at com.dev.test.web.impl.delegate.payment.PaymentServiceDelegateImpl.submitPayment(PaymentServiceDelegateImpl.java:215)
    at com.dev.test.web.impl.controller.payment.PaymentActionControllerImpl.handleSubmitPayment(PaymentActionControllerImpl.java:89)
    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.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426)
    at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)


I saw that when try to get process instances in ProcessInstanceInfo class, processInstanceByteArray is null. 
This is happening only when I send the signal after a while, not immediatly. 
Note: I am using openjpa for persistence. 

Thanks for help,

Liliana
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