mbbp [https://community.jboss.org/people/mbbp] created the discussion "update data to database" To view the discussion, visit: https://community.jboss.org/message/732908#732908 -------------------------------------------------------------- Hello guys I need your help. My problem is here : *     public* News merge(News detachedInstance) {            log.debug("merging News instance");            *try* {                 News result = entityManager.merge(detachedInstance);                 log.debug("merge successful");                 *return* result;            } *catch* (RuntimeException re) {       log.error("merge failed", re);       *throw* re;       }       } Error is : Caused by Java.lang           at News.merge(253) etc -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/732908#732908] Start a new discussion in Beginner's Corner at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]