I have a simple query and got into trouble if I add an order by statement (where condition is not used). Without the order statement everything works fine. What can happen, that an order by statement causes the EJBException:Nullpointerexception occurs? I use JBoss VM 4.0 Eclipse Plug-In and Hypersonic Database. Here is the code snippet.. @SuppressWarnings("unchecked") public List getTaskEntryForAdministration(String Worker, String Projekt) { try { String querystr = ""; String Filter = ""; if (!Worker.equals("")) Filter = Filter +" where worker.name='"+Worker+"'"; if (!Projekt.equals("")){ if (Filter.equals("")) Filter = Filter +" where task.project.project_name='"+Projekt+"'"; else Filter = Filter +" and task.project.project_name='"+Projekt+"'"; } String OrderBy = new String(" order by worker.name,task.project.project_name,task.task_name,start_time,end_time"); querystr = "from TaskEntry"+ Filter + OrderBy; List TaskEntryList = null; Query query = this.entityManager.createQuery(querystr); if (query!=null){ TaskEntryList = query.getResultList(); } return TaskEntryList; } catch (EJBException e) { e.printStackTrace(); if (e.getCause() == null) e.initCause(e.getCausedByException()); throw e; } } cheers View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4039380#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...