Hi,
I followed Jakes advice to do e.setList(list) but no change.
I've also stepped through my code, but there is no exception!
Btw I use version 1.3.1 of the SDK.
Gunnar
On 1 mar, 15:28, John Patterson <jdpatter...@gmail.com> wrote:
> It is unusual that you see no stack trace. Are you sure you are not
> catching it? You could step through the code line by line to see what
> happens after the line with the problem.
>
> Could this be something to do with setting the fetch group to
> default? That seems to be the problem with a lot of peoples JDO code :)
>
> On 1 Mar 2010, at 21:19, Jake wrote:
>
> > If I recall, JDO is picky when it comes to being aware of changes made
> > to a persisted object. For example, changing fields directly
> > (object.field = newValue;) doesn't work - you need to use a getter/
> > setter (object.setField(newValue);). Perhaps you are encountering the
> > same issue here? Does the following type of thing work?
>
> > LIst<SubEntity> list = e.getMyList();
> > SubEntity first = list.remove(0);
> > list.add(first);
> > e.setMyList(list);
> > pm.makePersistent(e);
> > tx.commit();
>
> > Jake
>
> > On Feb 28, 11:05 am, Gunnar <gunnar....@gmail.com> wrote:
> >> Hi,
> >> John and Karel, you are right about the placement of the commit
> >> statement.
> >> It worked in the test example because I only had one instance of
> >> MyEntity.
> >> I don't get any exception at all in the Eclipse console!
> >> When I add a second instance of MyEntity if fails with "Transaction
> >> is
> >> not active" as expected.
>
> >> Now I've changed the code in the try statement like this, but still
> >> the first sub entity is lost and no exception is thrown!
> >> (Of cause it would fail it the list is empty.)
>
> >> List<MyEntity> results = (List<MyEntity>) query.execute();
> >> if (results.iterator().hasNext()) {
> >> tx.begin();
> >> MyEntity e = results.iterator().next();
> >> List<SubEntity> list = e.getMyList();
> >> SubEntity first = list.remove(0);
> >> boolean ok = list.add(first);
> >> if (!ok) {
> >> System.err.println("could not add first");
> >> }
> >> System.out.println(list);
> >> pm.makePersistent(e);
> >> tx.commit();
> >> }
>
> >> On 28 Feb, 02:51, John Patterson <jdpatter...@gmail.com> wrote:
>
> >>> This should be throwing an exception. The JavaDocs for
> >>> Transaction.commit() say
> >>> Commits the transaction. Whether this call succeeds or fails, all
> >>> subsequent method invocations on this object will throw
> >>> IllegalStateException.
>
> >>> When something does not work as you expect the first place to look
> >>> is
> >>> the logs under your application console.
>
> >>> On 28 Feb 2010, at 05:25, Karel Alvarez wrote:
>
> >>>> dont you get any exceptions stacktrace in the server console? it
> >>>> would help... also you are calling commit() inside the for loop,
> >>>> although the transactions is started only once... that would crash
> >>>> in the second iteration in a normal db server, I am not sure what
> >>>> GAE does with it, in any case I dont think it is what you
> >>>> intended...
>
> >>>> On Sat, Feb 27, 2010 at 2:52 PM, Gunnar <gunnar....@gmail.com>
> >>>> wrote:
> >>>> Hi,
> >>>> I have problem with reordering a List.
> >>>> I created a test with an entity called MyEntity which have a
> >>>> List<SubEntity>.
> >>>> First I persist one instance of MyEntity with a list containing 3
> >>>> SubEntity.
> >>>> This works fine. Then I call a reorder servlet that moves the first
> >>>> SubEntity to the last position in the list.
> >>>> The result is that the first SubEntity is lost and the datastore
> >>>> only
> >>>> contains 2 SubEntity instances.
> >>>> What can be wrong?
> >>>> Here is the reorder code:
>
> >>>> package com.google.appengine.demo;
>
> >>>> import java.io.IOException;
> >>>> import java.util.List;
>
> >>>> import javax.jdo.PersistenceManager;
> >>>> import javax.jdo.Query;
> >>>> import javax.jdo.Transaction;
> >>>> import javax.servlet.http.HttpServlet;
> >>>> import javax.servlet.http.HttpServletRequest;
> >>>> import javax.servlet.http.HttpServletResponse;
>
> >>>> @SuppressWarnings("serial")
> >>>> public class ReorderServlet extends HttpServlet {
> >>>> �...@suppresswarnings("unchecked")
> >>>> public void doGet(HttpServletRequest req,
> >>>> HttpServletResponse
> >>>> resp)
> >>>> throws IOException {
> >>>> PersistenceManager pm =
> >>>> PMF.get().getPersistenceManager();
> >>>> Query query = pm.newQuery(MyEntity.class);
> >>>> Transaction tx = pm.currentTransaction();
> >>>> try {
> >>>> tx.begin();
> >>>> List<MyEntity> results = (List<MyEntity>)
> >>>> query.execute();
> >>>> if (results.iterator().hasNext()) {
> >>>> for (MyEntity e : results) {
> >>>> List<SubEntity> list =
> >>>> e.getMyList();
> >>>> SubEntity first =
> >>>> list.remove(0);
> >>>> boolean ok =
> >>>> list.add(first);
> >>>> if (!ok) {
>
> >>>> System.err.println("could not add first");
> >>>> }
> >>>> System.out.println(list);
> >>>> pm.makePersistent(e);
> >>>> tx.commit();
> >>>> }
> >>>> }
> >>>> } catch (Exception e) {
> >>>> e.printStackTrace();
> >>>> } finally {
> >>>> if (tx.isActive())
> >>>> tx.rollback();
> >>>> query.closeAll();
> >>>> pm.close();
> >>>> }
> >>>> resp.setContentType("text/plain");
> >>>> resp.getWriter().println("reordered");
> >>>> }
> >>>> }
>
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