I did some more tests on this issue. And this happens only if the objects in the database are big. Actual java objects are ArrayLists containing strings. However, one of those string could contain as many as 2000-3000 characters(i.e. 2k-3k). Others are generally shorter than 50 characters. However, if all the strings are short, it works without an error. Any ideas people? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4152206#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...