Something to investigate: http://static.springsource.org/spring/docs/2.5.x/api/org/springframework/orm/jdo/support/OpenPersistenceManagerInViewFilter.html
Shortened: http://xrl.in/408b Al wrote: > 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. > > -- 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.
