Hi,<br><br> I'm posting in this list because I will post very low level details which may not fit well in the user list. Please tell me if this is correct.<br><br> We are trying to build a system using JBPM with human task, and we are now using the recent LocalTaskService and LocalHTWorkItemHandler ... that way:<br>
<br>humanTaskClient = new LocalTaskService(taskService);<br>....<br><br>LocalHTWorkItemHandler localHTWorkItemHandler = new LocalHTWorkItemHandler(humanTaskClient, sesion);<br><br>....<br><br> We are facing a NullpointerException when unmarshalling the result of a completed human task. Here's the relevant stack trace:<br>
<br>11:11:21,734 ERROR [stderr] (http--0.0.0.0-8080-1) java.lang.NullPointerException<br>11:11:21,734 ERROR [stderr] (http--0.0.0.0-8080-1) at org.jbpm.marshalling.impl.ProtobufProcessMarshaller.unmarshallVariableValue(ProtobufProcessMarshaller.java:270)<br>
11:11:21,734 ERROR [stderr] (http--0.0.0.0-8080-1) at org.jbpm.task.utils.ContentMarshallerHelper.unmarshall(ContentMarshallerHelper.java:112)<br>11:11:21,750 ERROR [stderr] (http--0.0.0.0-8080-1) at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.handleCompletedTask(GenericHTWorkItemHandler.java:230)<br>
11:11:21,750 ERROR [stderr] (http--0.0.0.0-8080-1) at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.execute(GenericHTWorkItemHandler.java:204)<br>11:11:21,750 ERROR [stderr] (http--0.0.0.0-8080-1) at org.jbpm.task.service.local.LocalTaskService$SimpleEventTransport.trigger(LocalTaskService.java:320)<br>
11:11:21,750 ERROR [stderr] (http--0.0.0.0-8080-1) at org.jbpm.task.event.MessagingTaskEventListener.taskCompleted(MessagingTaskEventListener.java:80)<br>11:11:21,765 ERROR [stderr] (http--0.0.0.0-8080-1) at org.jbpm.task.event.TaskEventSupport.fireTaskCompleted(TaskEventSupport.java:46)<br>
11:11:21,765 ERROR [stderr] (http--0.0.0.0-8080-1) at org.jbpm.task.service.TaskServiceSession.postTaskCompleteOperation(TaskServiceSession.java:563)<br>11:11:21,765 ERROR [stderr] (http--0.0.0.0-8080-1) at org.jbpm.task.service.TaskServiceSession.taskOperation(TaskServiceSession.java:495)<br>
11:11:21,765 ERROR [stderr] (http--0.0.0.0-8080-1) at org.jbpm.task.service.local.LocalTaskService.complete(LocalTaskService.java:82)<br><br> Some inspection lead us to locate this snippet that is <br><br><br> ObjectMarshallingStrategyStore objectMarshallingStrategyStore = marshallingConfigurationImpl.getObjectMarshallingStrategyStore();<br>
context = new MarshallerReaderContext(stream, null, null, objectMarshallingStrategyStore, null, env);<br> if(classloader != null){<br> context.classLoader = classloader;<br> }else{<br>
context.classLoader = ContentMarshallerHelper.class.getClassLoader();<br> }<br> ExtensionRegistry registry = PersisterHelper.buildRegistry( context, null ); <br> Header _header = PersisterHelper.readFromStreamWithHeader(context, registry);<br>
Variable parseFrom = JBPMMessages.Variable.parseFrom(_header.getPayload(), registry);<br> Object value = ProtobufProcessMarshaller.unmarshallVariableValue(context, parseFrom);<br><br><br> which is radically different from the previous implementation ( protocol buffers appears ).<br>
<br> The problem is that in this code ( in ProtobufProcessMarshaller ) :<br><br> ObjectMarshallingStrategy strategy = context.usedStrategies.get( _variable.getStrategyIndex() );<br> Object value = strategy.unmarshal( context.strategyContexts.get( strategy ),<br>
context,<br> _variable.getValue().toByteArray(), <br> (context.ruleBase == null)?null:context.ruleBase.getRootClassLoader() );<br>
return value;<br><br> context.usedStrategies and context.strategyContexts are both Maps of size 0. And so the NPE.<br><br> Our process runs ok before creating the human task and it only fails when completing a human task.<br>
<br> Any insight on what can be happening here? <br><br>Greets,<br><br><br clear="all">Alberto R. Galdo<br><a href="mailto:argaldo@gmail.com" target="_blank">argaldo@gmail.com</a><br><br>