I have the same problem but working with JBoss 5.1.0 (not the candidate release), hibernate (core 3.3.2). Any clue about this? My hate exception... 2009-12-10 11:14:45,437 ERROR [org.jboss.kernel.plugins.dependency.AbstractKernelController] (main) Error installing to Start: name=persistence.unit:unitName=THE_EAR.ear/PROJECT_EJB.jar#DataBase state=Create | java.lang.StackOverflowError | at java.util.HashMap.get(Unknown Source) | at org.hibernate.cfg.AnnotationConfiguration.buildRecursiveOrderedFkSecondPasses(AnnotationConfiguration.java:506) | at org.hibernate.cfg.AnnotationConfiguration.buildRecursiveOrderedFkSecondPasses(AnnotationConfiguration.java:520) | ... | repeat the last line too many times and after jboss undeploy de ejbs... | View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4269983#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...