[jBPM] - Error starting process instance - getting HTTP 500: Unknown error

Senthil Sathiya [https://community.jboss.org/people/skumar0105] created the discussion

"Error starting process instance - getting  HTTP 500: Unknown error"

To view the discussion, visit: https://community.jboss.org/message/830796#830796

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Hi ,

I have created a  simple bpmn job using jbpm 5.4 libraries "start --->  task -> and end event". I have attached a custom work item handler to the task ( CustomHandler.java) . I have been able to successfully commit the bpm file into guvnor and compile the package. The Jar file is copied into \jboss-as-7.1.1.Final\standalone\deployments\jbpm-gwt-console-server.war\WEB-INF\lib\ folder. 

When I open the  jbpm console ( http://localhost:8080/jbpm-console/ http://localhost:8080/jbpm-console/ ) i can see the process listed , but when I try to click start the process it errors out with the following msg :

server/rs/process/definition/com.sample.bpmn.sampleHTformvariables/new_instance
2013-07-31 16:23:37,610 [ERROR] <ul><li>URL: ' http://localhost:8080/gwt-console-server/rs/process/definition/com.sample.bpmn.sampleHTformvariables/new_instance http://localhost:8080/gwt-console-server/rs/process/definition/com.sample.bpmn.sampleHTformvariables/new_instance'
<li>Action: 'org.jboss.bpm.console.client.process.StartNewInstanceAction'
<li>Exception: 'class com.google.gwt.http.client.RequestException'</ul>

HTTP 500: Unknown error
com.google.gwt.http.client.RequestException:
HTTP 500: Unknown error


When I replace the Task with a User Task , the process starts without any issues.

I would appreciate some assistance on this , have been dealing with this issue for the past few days !

Thanks in advance

Senthil
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