"kukeltje" wrote : now that is good information..... So 3.2.2 out of the box runs with jdk 1.5 of some JBoss AS server, but 3.2.3 does not. The log4j logging could show in what stage the process is in when it is signalled. 'The fork' is the fork in the websale example? Then the error only can be in org.jbpm.websale.ShipItem. Can you tell me | - what the version number in that class is? | - how you deployed this process or was it in the preconfigured database? | - what happens if you run with jdk6? At the very beginning of my question, I said "When I started the websale sample server", maybe that's not clear enough to you. 1. I have no idea in which jar I can find the class. The attached source code has the following private static final long serialVersionUID = 1L; but the class file in the jar may not be the same. 2. I didn't deploy. As I said, I just run the command without any modification, which means it running with the embedded hsqldb 3. It works fine on jdk1.6.0_07 but not 1.5.0_12 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4165219#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...