I try to detect the constraintviolation now via catch (RuntimeException e) | { if (e.getCause().getCause().getCause().getClass().toString().equals("class org.hibernate.exception.ConstraintViolationException") ) | { DO SOMETHING is that OK? But there are two things I don´t understand. 1) why are there two identical exceptions? Is that a problem? 2) I guarded the call of the remove request with a try-catch block, but the exception is not cougth in this catchblock | try | { em.remove(deleteBg); | } | catch (Exception e) | { logger.error("... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4020550#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...