hi stephan On 12/15/05, stephan lohwasser <[EMAIL PROTECTED]> 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. > > >
