4:21 a.m.
Hi,
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.
We are trying to build a system using JBPM with human task, and we are
now using the recent LocalTaskService and LocalHTWorkItemHandler ... that
way:
humanTaskClient = new LocalTaskService(taskService);
....
LocalHTWorkItemHandler localHTWorkItemHandler = new
LocalHTWorkItemHandler(humanTaskClient, sesion);
....
We are facing a NullpointerException when unmarshalling the result of a
completed human task. Here's the relevant stack trace:
11:11:21,734 ERROR [stderr] (http--0.0.0.0-8080-1)
java.lang.NullPointerException
11:11:21,734 ERROR [stderr] (http--0.0.0.0-8080-1) at
org.jbpm.marshalling.impl.ProtobufProcessMarshaller.unmarshallVariableValue(ProtobufProcessMarshaller.java:270)
11:11:21,734 ERROR [stderr] (http--0.0.0.0-8080-1) at
org.jbpm.task.utils.ContentMarshallerHelper.unmarshall(ContentMarshallerHelper.java:112)
11:11:21,750 ERROR [stderr] (http--0.0.0.0-8080-1) at
org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.handleCompletedTask(GenericHTWorkItemHandler.java:230)
11:11:21,750 ERROR [stderr] (http--0.0.0.0-8080-1) at
org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.execute(GenericHTWorkItemHandler.java:204)
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)
11:11:21,750 ERROR [stderr] (http--0.0.0.0-8080-1) at
org.jbpm.task.event.MessagingTaskEventListener.taskCompleted(MessagingTaskEventListener.java:80)
11:11:21,765 ERROR [stderr] (http--0.0.0.0-8080-1) at
org.jbpm.task.event.TaskEventSupport.fireTaskCompleted(TaskEventSupport.java:46)
11:11:21,765 ERROR [stderr] (http--0.0.0.0-8080-1) at
org.jbpm.task.service.TaskServiceSession.postTaskCompleteOperation(TaskServiceSession.java:563)
11:11:21,765 ERROR [stderr] (http--0.0.0.0-8080-1) at
org.jbpm.task.service.TaskServiceSession.taskOperation(TaskServiceSession.java:495)
11:11:21,765 ERROR [stderr] (http--0.0.0.0-8080-1) at
org.jbpm.task.service.local.LocalTaskService.complete(LocalTaskService.java:82)
Some inspection lead us to locate this snippet that is
ObjectMarshallingStrategyStore objectMarshallingStrategyStore =
marshallingConfigurationImpl.getObjectMarshallingStrategyStore();
context = new MarshallerReaderContext(stream, null, null,
objectMarshallingStrategyStore, null, env);
if(classloader != null){
context.classLoader = classloader;
}else{
context.classLoader =
ContentMarshallerHelper.class.getClassLoader();
}
ExtensionRegistry registry = PersisterHelper.buildRegistry(
context, null );
Header _header =
PersisterHelper.readFromStreamWithHeader(context, registry);
Variable parseFrom =
JBPMMessages.Variable.parseFrom(_header.getPayload(), registry);
Object value =
ProtobufProcessMarshaller.unmarshallVariableValue(context, parseFrom);
which is radically different from the previous implementation (
protocol buffers appears ).
The problem is that in this code ( in ProtobufProcessMarshaller ) :
ObjectMarshallingStrategy strategy = context.usedStrategies.get(
_variable.getStrategyIndex() );
Object value = strategy.unmarshal( context.strategyContexts.get(
strategy ),
context,
_variable.getValue().toByteArray(),
(context.ruleBase ==
null)?null:context.ruleBase.getRootClassLoader() );
return value;
context.usedStrategies and context.strategyContexts are both Maps of
size 0. And so the NPE.
Our process runs ok before creating the human task and it only fails
when completing a human task.
Any insight on what can be happening here?
Greets,
Alberto R. Galdo
argaldo(a)gmail.com