I might have missed this, but what version of JBoss? > -----Original Message----- > From: Beau Cronin [mailto:[EMAIL PROTECTED]] > Sent: Wednesday, January 22, 2003 2:45 PM > To: [EMAIL PROTECTED] > Subject: Re: [JBoss-user] Can two separate client threads make > simultaneous calls? > > > There are two messages which appear. The first is: > > 2003-01-22 11:31:08,725 ERROR [org.jboss.ejb.BeanLock] Application > deadlock detected: TransactionImpl:XidImpl [FormatId=257, > GlobalId=redbull//3324, BranchQual=] has deadlock conditions. Two or > more transactions contending for same resources and each have locks > eachother need. > 2003-01-22 11:31:08,728 ERROR [org.jboss.ejb.plugins.LogInterceptor] > TransactionRolledbackLocalException, causedBy: > org.jboss.ejb.plugins.lock.ApplicationDeadlockException: Application > deadlock detected: Two or more transactions contention. at > org.jboss.ejb.plugins.lock.BeanLockSupport.deadlockDetection(BeanLock > Support.java:136) at > org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock.waitForTx(QueuedP > essimisticEJBLock.java:270) at > org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock.doSchedule(Queued > PessimisticEJBLock.java:202) at > org.jboss.ejb.plugins.lock.QueuedPessimisticEJBLock.schedule(QueuedPe > ssimisticEJBLock.java:150) > > I've read the deadlock section of the docs, but I still don't > understand > how this situation (separate threads in a remote client) is different > from the one in which entirely different clients are making the same > requests (in which case I never have problems of this sort). > > The other message is this one: > > 2003-01-22 11:34:34,195 ERROR [STDERR] > javax.ejb.TransactionRolledbackLocalException: The iterator of a CMR > collection may only be used within the transction in which it was > created; CausedByException is: > The iterator of a CMR collection may only be used within the > transctionin which it was created > 2003-01-22 11:34:34,196 ERROR [STDERR] at > org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(Abstrac > tTxInterceptor.java:224) > 2003-01-22 11:34:34,197 ERROR [STDERR] at > org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxI > nterceptorCMT.java:178) > 2003-01-22 11:34:34,198 ERROR [STDERR] at > org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT > .java:60) > > I certainly understand the nature of the transcation/iterator > restriction, but why would these calls from separate client > threads be > tickling this? > > Again, there must be something I'm just not getting. Shouldn't it be > possible to do this? > > Thanks for your time and attention on this matter. I look forward to > your response. > > Beau > > Alex Loubyansky wrote: > > > what is the problem? what locking policy are you using? > > > > alex > > > > Wednesday, January 22, 2003, 8:43:05 PM, you wrote: > > > > BC> I have a Swing app which is essentially > single-threaded, accessing the > > BC> server in the usual way through a session facade. I'd > like to do some > > BC> background loading of certain data for performance > reasons, but when I > > BC> try to do this by using a separate thread (and separate session > > BC> instance), I get various transaction collision problems > if these two > > BC> threads access the server at the same time. > > > > BC> I'm obviously missing something here--shouldn't > different remote client > > BC> threads from the same client be able to access JBoss > simultaneously in > > BC> the same way that entirely different clients can? > I.e., shouldn't they > > BC> spawn separate transactions which are scheduled > appropriately by JBoss? > > > > BC> Any clarification appreciated, > > > > BC> Beau Cronin
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