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From Stefan Guggisberg <stefan.guggisb...@gmail.com>
Subject Re: threading problems
Date Thu, 15 Dec 2005 16:13:52 GMT
i quickly checked the implementation and i am pretty sure that
you are sharing a session among multiple threads. the thread
that does the import is most probably using the same session
as the other thread that performs the write operations.

cheers
stefan

On 12/15/05, Stefan Guggisberg <stefan.guggisberg@gmail.com> wrote:
> hi stephan
>
> On 12/15/05, stephan lohwasser <stephan.lohwasser@systemone.at> wrote:
> > hi,
> > i have a problem concerning threads and synchronisation and i have not
> > the faintest idea how to solve it:
> >
> > we're writing a wiki-weblog application based on jackrabbit. now when i
> > run a thread importing data from wikipedia with one session while a
> > normal user is logged into the system via another session, a
> > 'javax.jcr.RepositoryException: Unable to start edit operation: Already
> > in edit mode: Already in edit mode' is thrown when the user tries to
> > write or read data out of the repository.
> > i guess it is a problem of multiple threads working on the same data,
> > but i'm not sure.
> >
> > is there any synchronisation of sessions working on the repository, or
> > do i have to take care of it by myself?
> > do you have any hints for me?
>
> jackrabbit should be thread-safe although i can't guarantee that
> there aren't still some hidden issues. as long as you don't share
> Session objects among multiple threads there shouldn't be any
> unexpected issues. if n threads modify the *same* item concurrently
> only one thread will succeed and the others will get InvalidItemStateExceptions
> informing them that their modifications have become stale.
> this is by design. to prevent this you have to lock the node you're
> working on.
>
> your problem though seems to be caused by another issue.
> please provide a full thread dump and ideally some simple
> code to reproduce the problem.
>
> cheers
> stefan
>
> >
> > thanks a lot.
> > stephan.
> >
> >
> >
>

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