i have resolved this problem, ROrganizationService | public int deleteObj(int id) { | OrganizationEO org = queryByID(id); | if(null != org && null != org.getParentObj()) | { | OrganizationEO superOrg = queryByID(org.getParentObj().getId()); | if(null != superOrg && null != superOrg.getSonOrgs()) | { | superOrg.getSonOrgs().remove(org); | em.merge(superOrg); | } | } | return CommonDBAction.deleteObjById(id, em, org); | } | because of the parentOrganization who referenced to current Organization,it is impossable to delete current organization.now it can runs well.. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4172644#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...