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From "Justin Randall" <>
Subject Re: InterruptedException with embedded 5.5.0 broker
Date Sun, 01 May 2011 18:18:57 GMT

Not being familiar with the MQ code itself but experienced in Java, InterruptedException typically
occurs with a thread is interrupted for various reasons, but most commonly thread cancellation/shutdown.

From the stack trace it looks like this occurred during the shutdown procedure for the TCP
pooled executor service.

The fact that InterruptedException occurred is normal and should be expected (anytime you
shutdown an executor service InterruptedException occurs on all active threads in the executor
service), but it is not typical to catch InterruptedException and print a stack trace.   Usually
you should allow InterruptedException to propagate through so that the executor service can
properly shutdown all threads.  If it is being caught and printed in the manner as indicated
below, it would cause improper thread shutdown.  Common practices can also include catching
InterruptedException, then performing cleanup work and then re-throwing the exception or calling
Thread.currentThread().interrupt() when complete (allowing the interruption to "bubble up"
to the executor service).

That said, if this is only occurring when you are shutting down MQ, while it may not be a
sign of good handling of InterruptedException, it is unlikely to cause any problems.


Justin Randall
------Original Message------
From: dcheckoway
Subject: Re: InterruptedException with embedded 5.5.0 broker
Sent: May 1, 2011 12:04

I always forget to mention something...possibly relevant bits of info:

a. This wasn't happening with 5.4.2, but is happening regularly
(intermittently) with 5.5.0.

b. The pattern this application uses is rapid-fire producing -- no consuming
on that connection.

-----Dan Checkoway
dcheckoway gmail com--
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