Hi I just wanted to confirm that I am using the PersistenceManager in the correct manner... I have a List of a JDO persisted class retrieved in my Spring MVC controller as follows:
protected ModelAndView handleRequestInternal(HttpServletRequest req, HttpServletResponse resp) throws Exception { PersistenceManager pm = PersistenceHelper.getPersistenceManagerFactory().getPersistenceManager (); String query = "select from " + Feed.class.getName() + " order by lastNewItem desc"; List<Feed> feeds = (List<Feed>)pm.newQuery(query).execute(); pm.retrieveAll(feeds); pm.close(); ModelAndView mv = new ModelAndView(); mv.addObject("feedList", DataUtil.getFeeds()); mv.setViewName("feeds"); return mv; } This is passing the List of Feed objects to the view which iterates through and displays each. My problem is that I need to close the PersistenceManager in this method and unless I use the pm.retrieveAll () method, I get an org.datanucleus.exceptions.NucleusUserException: Object Manager has been closed error. My problem is that I don't need to load ALL of the fields in the Feed class... in particular it owns a 1:M relationship to FeedItem and I would rather not load all of these as well. I have tried annotating this field in my Feed class as follows: @Persistent(mappedBy = "feed", defaultFetchGroup="false") private List<FeedItem> items; ... but they all get loaded anyway. Is there any way to configure this? Alternatively, I could choose not to close the PersistenceManager but I assume this is expensive and bad practice? Thanks in advance Al. -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-j...@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.