Hi all, I am trying to execute the bellow code, private boolean isUserNameExist(){ Users users = getInstance(); String qry = "from Users where userName=:userName AND tenantId =:tenantId"; Query query = entityManager.createQuery(qry); query.setParameter("userName",users.getUserName()). setParameter("tenantId", users.getTenantId()); List lst =query.getResultList(); return lst.size() > 0 ? true : false; } but i am getting an entirely different exception like bellow.The exception is throwing at "List lst =query.getResultList(); " . 11:22:54,328 ERROR [JDBCExceptionReporter] ERROR: duplicate key violates unique constraint "ad_users_u2" 11:22:54,328 ERROR [AbstractFlushingEventListener] Could not synchronize database state with session org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:71) at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43) Can anybody can help me to fix it. Thanks in advance vivek View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4166302#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...