[jboss-user] [jBPM] - Re: Getting process instance variables

[jnorris]

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

"Re: Getting process instance variables"

To view the discussion, visit: https://community.jboss.org/message/754264#754264

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Hi Maciej,

Yes we are using persistence.  The api call to start a process and the call to get a process instance take place in seperate web service calls.

Here's the code:

org.jbpm.process.instance.ProcessInstance processInstance = (org.jbpm.process.instance.ProcessInstance) ksession.getProcessInstance( processInstanceId );
VariableScopeInstance variableScope = (VariableScopeInstance) processInstance.getContextInstance(VariableScope.VARIABLE_SCOPE);
Map<String, Object> variables = variableScope.getVariables();

Here's the stacktrace:

2012-08-17 08:47:36,324 ERROR [ProcessInstanceProviderJbpm] (http-127.0.0.1-8080-1) ProcessInstanceProviderJbpm.getProcessDefinitionInstance() - Exception!
java.lang.NullPointerException
          at org.jbpm.process.instance.impl.ProcessInstanceImpl.getProcess(ProcessInstanceImpl.java:67)
          at org.jbpm.process.instance.impl.ProcessInstanceImpl.getContextInstance(ProcessInstanceImpl.java:127)
          at com.pb.keystone.bpm.provider.jbpm.ProcessInstanceProviderJbpm.getProcessDefinitionInstance(ProcessInstanceProviderJbpm.java:218)
          at com.pb.keystone.bpm.BPMServiceImpl.getProcessInstance(BPMServiceImpl.java:569)
          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.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:173)
          at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:89)
          at org.apache.cxf.jaxws.JAXWSMethodInvoker.invoke(JAXWSMethodInvoker.java:60)
          at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:75)
          at org.apache.cxf.interceptor.ServiceInvokerInterceptor$1.run(ServiceInvokerInterceptor.java:58)
          at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
          at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
          at java.util.concurrent.FutureTask.run(Unknown Source)
          at org.apache.cxf.workqueue.SynchronousExecutor.execute(SynchronousExecutor.java:37)
          at org.apache.cxf.interceptor.ServiceInvokerInterceptor.handleMessage(ServiceInvokerInterceptor.java:106)
          at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:243)
          at org.apache.cxf.transport.ChainInitiationObserver.onMessage(ChainInitiationObserver.java:111)
          at org.apache.cxf.transport.servlet.ServletDestination.invoke(ServletDestination.java:99)
          at org.apache.cxf.transport.servlet.ServletController.invokeDestination(ServletController.java:431)
          at org.apache.cxf.transport.servlet.ServletController.invoke(ServletController.java:186)
          at org.apache.cxf.transport.servlet.AbstractCXFServlet.invoke(AbstractCXFServlet.java:148)
          at org.apache.cxf.transport.servlet.AbstractHTTPServlet.handleRequest(AbstractHTTPServlet.java:179)
          at org.apache.cxf.transport.servlet.AbstractHTTPServlet.doPost(AbstractHTTPServlet.java:103)
          at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
          at org.apache.cxf.transport.servlet.AbstractHTTPServlet.service(AbstractHTTPServlet.java:159)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
          at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
          at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
          at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
          at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
          at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
          at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:183)
          at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:95)
          at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
          at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
          at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
          at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
          at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
          at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
          at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.internalProcess(ActiveRequestResponseCacheValve.java:74)
          at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:47)
          at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
          at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
          at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:599)
          at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:451)
          at java.lang.Thread.run(Unknown Source)

Regards,
Jim
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