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From Jim Alateras <j...@comware.com.au>
Subject Re: deadlock while publishing a message.
Date Wed, 12 Sep 2007 06:25:26 GMT
Rob,
Using the embedded broker but couldn't locate the thread holding the 
lock. The problem is that it is blocking the client thread. If i use 
something like async=true then will the delivery happen in a separate 
thread?

cheers
</jima>
Rob Davies wrote:
> the client is waiting for a response from the broker - what's the broker 
> doing whilst you are doing this ?
> 
> cheers,
> 
> Rob
> 
> 'Go Get Integrated -  ride the Camel! - http://activemq.apache.org/camel/'
> http://rajdavies.blogspot.com/
> 
> 
> 
> On Sep 11, 2007, at 11:27 PM, Jim Alateras wrote:
> 
>> I am using activemq 5.0-SNAPSHOT with a current project and have just 
>> come across a situation where a thread blocks indefinitely trying to 
>> publish a message. It happens during the session commit
>>
>> The method ActiveMQDispatcherClient.dispatch is synchronized.
>>
>> Here is the stack trace.
>>
>> Thread [pool-5-thread-1] (Suspended)   
>>     Unsafe.park(boolean, long) line: not available [native method]   
>>     LockSupport.park() line: 118   
>>     AbstractQueuedSynchronizer$ConditionObject.await() line: 1767   
>>     ArrayBlockingQueue<E>.take() line: 341   
>>     FutureResponse.getResult() line: 40   
>>     ResponseCorrelator.request(Object) line: 76   
>>     ActiveMQConnection.syncSendPacket(Command) line: 1168   
>>     TransactionContext.commit() line: 259   
>>     ActiveMQSession.commit() line: 491   
>>     DefaultEnqueueStrategy<T>.dispatch(Session, MessageProducer, 
>> DispatcherQueue, List<T>) line: 83   
>>     ActiveMQDispatcherClient.dispatch(List<T>) line: 195   
>>     Hub.dispatchObservations(List<DeviceFieldObservation>) line: 1004   
>>     ZoneFacadeImpl.observationsMade(List) line: 785   
>>     DeviceFieldObservationVendorImpl.vendObservations(List) line: 183   
>>     DeviceFieldObservationVendorImpl$StatusEventHandler.notifyEvent(DeviceEvent)

>> line: 687   
>>     EventManager$EventDeliverer.run() line: 174   
>>     Executors$RunnableAdapter.call() line: 442   
>>     ScheduledThreadPoolExecutor$ScheduledFutureTask(FutureTask).run() 
>> line: 176   
>>     ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor$ScheduledFutureTask)

>> line: 102   
>>     ScheduledThreadPoolExecutor$ScheduledFutureTask.run() line: 215   
>>     ThreadPoolExecutor$Worker.runTask(Runnable) line: 665   
>>     ThreadPoolExecutor$Worker.run() line: 690   
>>     Thread.run() line: 613   
>>
>>
>> cheers
>> </jima>
> 
> 


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