3 Replies Latest reply on Mar 14, 2013 4:13 AM by wishmaster7

completing human task - NoSuchFieldError: classLoader

wishmaster7 Mar 13, 2013 12:37 PM

Hi all,

I have found something very strange when I complete a Human Task. Here is what I do:

Map<String, Object> result = new HashMap<String, Object>();

result.put("Result", action);

taskService.completeWithResults(taskId, userId, result);

and I have the following error:

java.lang.NoSuchFieldError: classLoader

at org.jbpm.task.utils.ContentMarshallerHelper.unmarshall(ContentMarshallerHelper.java:107)

at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.handleCompletedTask(GenericHTWorkItemHandler.java:260)

at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.execute(GenericHTWorkItemHandler.java:234)

at org.jbpm.task.service.local.LocalTaskService$SimpleEventTransport.trigger(LocalTaskService.java:329)

at org.jbpm.task.event.MessagingTaskEventListener.triggerPayload(MessagingTaskEventListener.java:76)

at org.jbpm.task.event.MessagingTaskEventListener.handleEvent(MessagingTaskEventListener.java:92)

at org.jbpm.task.event.MessagingTaskEventListener.taskCompleted(MessagingTaskEventListener.java:109)

at org.jbpm.task.event.TaskEventSupport.fireTaskCompleted(TaskEventSupport.java:49)

at org.jbpm.task.service.TaskServiceSession.postTaskCompleteOperation(TaskServiceSession.java:569)

at org.jbpm.task.service.TaskServiceSession.taskOperation(TaskServiceSession.java:495)

at org.jbpm.task.service.local.LocalTaskService.complete(LocalTaskService.java:83)

at org.jbpm.task.service.local.LocalTaskService.completeWithResults(LocalTaskService.java:91)

So, I search in the code, and I find :

MarshallerReaderContext context = null;

context.classLoader = ContentMarshallerHelper.class.getClassLoader();

BUT... (something I can't explain), MarshallerReaderContext has no classLoader. This throws the error above.

Someone knows? Any help would be apreciated.

1. Re: completing human task - NoSuchFieldError: classLoader

thomas.setiabudi Mar 14, 2013 12:02 AM (in response to wishmaster7)

Hi wishmaster7,

use something like this with JBPM5.4

java.util.Map<String, Object> result = new java.util.HashMap<String, Object>();
                    result.put("Result", action);

                    org.jbpm.task.service.ContentData contentData = org.jbpm.task.utils.ContentMarshallerHelper.marshal(result, null);
                    taskService.complete(taskId, userId, contentData);

Regards,

Thomas Setiabudi

2. Re: completing human task - NoSuchFieldError: classLoader

wishmaster7 Mar 14, 2013 3:29 AM (in response to thomas.setiabudi)

Hi Thomas,

This is a good idea, and I have already tried it. But if you look at the error stack trace, you see that completeWithResults() calls complete(), which calls the marshaller another time and makes the error. So the same problem happens.
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3. Re: completing human task - NoSuchFieldError: classLoader

wishmaster7 Mar 14, 2013 4:13 AM (in response to wishmaster7)

if someone has the same problem, I found the solution:

I was using:

- jbpm-human-task-core-5.4.0.Final.jar
- drools-core-5.4.0.Final.jar

instead, use:

- jbpm-human-task-core-5.4.0.Final.jar
- drools-core-5.5.0.Final.jar
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