[jboss-user] [jBPM Users] - Re: Process Step Exception

[guancio]

I got the same exception using jbpm 3.2 on JBoss 5. After 4 hours of investigation I've found that my development approach was not correct.

The main cause of the problem was that I was trying to use the JBPM enterprise installation from a Web Application deployed on the same JBoss container. My first attempt was to add the jbpm-identity and jbpm-jpdl jars as J2EE module dependencies and deploy them inside  WEB-INF/lib of my War.

Initially, this step was required to avoid class not found exception while accessing to the jbpm structures.

I think that the java.lang.ClassCastException occurred because the interface of org.jbpm.msg.jms.JmsMessageServiceFactory is not present inside jbpm-identity and jbpm-jpdl jars. Instead the interface is located inside the jbpm-enterprise.jar directory.
Namely, I think that Java run-time raises the exception because jbpm-enterprise.jar is loaded by a different Java class loader.

I solved my problem as follows:

  | I removed jbpm-* jars from my WEB-INF/lib deployment
  | I deployed the war of my application inside deploy/jbpm directory of JBoss, instead of deploy. This avoid the class not found exceptions
  | I added the web.xml and jboss-web.xml deployment descriptors inside my WEB-INF directory, using the contents described in http://docs.jboss.com/jbpm/v3.2/userguide/html_single/#clientcomponents. This avoid jms name not bound exceptions.
  | 
  | 
  | I think that JBoss documentation on how to use jbpm from Web and enterprise applications really lacks details and a good tutorial.
  | 
  | 

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