JBoss 3.0.4/Tomcat 4.0.6
Beau
[EMAIL PROTECTED] wrote:
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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