[jboss-user] [jBPM] - Re: getProcess in ProcessInstanceImpl throws a NullPointerException

[Marco Rietveld]

Marco Rietveld [https://community.jboss.org/people/marco.rietveld] created the discussion

"Re: getProcess in ProcessInstanceImpl throws a NullPointerException"

To view the discussion, visit: https://community.jboss.org/message/806737#806737

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I am lucky enough to spend most of my time working on jBPM -- and it is indeed awesome!

One approach to your problem is to switch from "pass-by-value" to "pass-by-reference" for your variable assignment. In other words, instead of passing the primitive values (String, int, etc.), you can pass an object containing these values as a parameter. If you want to retrieve the values later, you simply make sure that your code keeps a reference to the object so that you can retrieve and modify the (possibly changed) values. 

This means the following: 
1. Making sure that the object used is in the classpath -- you need to put in the classpath of the application server or your war. 
2. Correctly referencing and extracting the information from your object -- whether that's in your WorkItemHandler implementation or a scriptTask.

Because of persistence, the object also needs to be serialized. Hmm.. I'll make a example of this today/tomorrow and post a link for you here.
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