Yep, if they are not initialized you can get these errors (afaik). Converters in the webpage could help, as is initializing them. I have not tried/done this (yet) with the new webapp, but if you get this working it is a nice example for the wiki or even for in the examples within jBPM Maybe you can file a jira issue that an example with this construct should be a nice addition to the existing examples. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4004315#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...