I ran into this problem too. Any chance you are using JBoss Tools for Eclipse? The tool puts the wrong property name in the configuration file.
The "processdefinition" property name is wrong, it should be "process-definition-name".
Thanks a lot! After changing processdefinition to process-definition-name everything works like it should.
But not only that the Eclipse Tools do it wrong, the Service Guide PDF also calls it processdefinition. That's really annoying and should definitely be corrected.
cool! very informative!
Any chance you could raise a jira for this issue....
Looking into this issue, it was fixed in JBoss Tools 3.1.1 and is also fixed in the JBoss Tools 3.2 stream per JBIDE-6059 (https://jira.jboss.org/browse/JBIDE-6059). Please try updating to the 3.1.1 build you can download here: http://jboss.org/tools/download/stable/3_1_GA.html
Hope that helps!