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From "Dave Dombrosky" <dom...@gmail.com>
Subject Re: Exception with Tomcat's session restore capability
Date Mon, 11 Sep 2006 20:53:24 GMT
Tomcat is doing the serialization of the session internally when it
restarts, so I have no idea how it does it.  I don't know much about
serialization, but I would be able to look into it if I knew what I
should be investigating.

On 9/11/06, Mike Kienenberger <mkienenb@gmail.com> wrote:
> No, I wouldn't try changing the transient nature.
>
> It does seem kinda odd, though.  I know that I'm saving serialized
> objects two different ways -- by individual DataObject for one
> read-only context, and by DataContext for a modified set of objects.
> I don't think I have seen this particular problem.
>
> Are you serializing the DataContext directly?
>
>
> On 9/11/06, Dave Dombrosky <dombrd@gmail.com> wrote:
> > I downloaded the 1.2.1 source and added some code to figure out what
> > is going on.  It appears that context.getChannel() from
> > ObjectStore.java line 945 is returning null.  I am guessing that this
> > is because of DataContext line 182 which declares the channel to be
> > transient.  Transient properties are not serialized, which is how
> > tomcat saves the session, so it is reverting back to it's default
> > value (null).
> >
> > I tried removing the "transient" part of the variable declaration, but
> > then Tomcat complains on a different piece of code.  I'm not even sure
> > if that's the best way to fix it so I don't think I'll explore that
> > any further yet.  Is this issue something that I should add to JIRA?
> >
> > -Dave
> >
> > On 9/11/06, Mike Kienenberger <mkienenb@gmail.com> wrote:
> > > My suggestion would be to look at the 1.2.1 source and see what's
> > > going on at ObjectStore.java, line 945.
> > >
> > > On 9/11/06, Dave Dombrosky <dombrd@gmail.com> wrote:
> > > > Problem still occurs on 1.2.1
> > > >
> > > > On 9/11/06, Mike Kienenberger <mkienenb@gmail.com> wrote:
> > > > > Maybe http://issues.apache.org/cayenne/browse/CAY-614 ?
> > > > >
> > > > > This was fixed for 1.2.1.   It might be related.
> > > > >
> > > > > On 9/11/06, Dave Dombrosky <dombrd@gmail.com> wrote:
> > > > > > I am currently having problems when trying to use Cayenne 1.2
along
> > > > > > with Tomcat's (v5.0.28) session restore capability.  That is
to say,
> > > > > > if I deploy new code and restart tomcat, it saves the session
data
> > > > > > instead of starting with all new sessions when it starts up.
> > > > > >
> > > > > > My problem is that I used to be able to restart and stay logged
in
> > > > > > using version 1.1.  Version 1.2 seems to have problems with
trying to
> > > > > > look up data after I have restarted Tomcat, and I get this stack
trace
> > > > > > caused by a NullPointerException:
> > > > > >
> > > > > > org.objectstyle.cayenne.access.ObjectStore.resolveHollow(ObjectStore.java:945)
> > > > > > org.objectstyle.cayenne.access.DataContext.prepareForAccess(DataContext.java:1842)
> > > > > > org.objectstyle.cayenne.CayenneDataObject.readProperty(CayenneDataObject.java:238)
> > > > > >
> > > > > > I couldn't find anyone else with this problem, so I assume I
am doing
> > > > > > something wrong and it's not a bug.  Any ideas?
> > > > > >
> > > > > > -Dave
> > > > > >
> > > > >
> > > >
> > >
> >
>

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