This exception typically happens when you run JBossAS with JDK6. Apparently, either the account used to run JBossAS as a service has JAVA_HOME set to JDK6, or Tanuki is configured to use JDK6. See http://www.jboss.com/index.html?module=bb&op=viewtopic&t=102355 I would point you to the wiki article that talks about this but the wiki changed last Friday, none of the links I saved are working any more, and I cannot seem to find the article. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4181896#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...