Because of JBM dependencies on JBoss AS 4.2 client libraries there does not seem to be a way for JBM to support 1.4 on the client side. http://jira.jboss.com/jira/browse/JBPAPP-212?page=comments In my honest opinion using solutions like JBossRetro, Retroweaver or Retrotranslator will simply add to the already large client-side dependencies, in addition to requiring an infeasible amount of testing to guaranty they don't have side effects. As a side issue this should be made explicitly clear in the documentation so that users like that are constrained by 1.4 code are clear they are unable to use JBM. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4051677#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...