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From rlemmers <ruud.lemm...@cgi.com>
Subject Qpid Proton (Java) - send() method frequently hangs when sending to ActiveMQ queue
Date Fri, 26 Aug 2016 08:20:11 GMT
I'm using Qpid Proton (proton-j-0.13.0) to send messages over AMQP to an
ActiveMQ 5.12.0 queue. On a development machine, where ActiveMQ and the Java
program run on the same machine, this is working fine. On a test
environment, where ActiveMQ is running on a separate server, we see the
send() method hangs in 15 to 20 percent of the cases. The CPU also remains
around 100% when the send() method hangt. When the send() succeeds, it
completes within 0.1 seconds.

*Statements to perform a send are similar to this:*
final Messenger messenger = Messenger.Factory.create();
messenger.put(message); // one message of 1 KByte

I'm aware Messenger.send(int n) is a blocking method. However, I don't know
why it would block my calls. I can add a timeout and try to resend the
message, but that's a workaround instead of a proper solution.

*Statements to receive the sent messages from ActiveMQ are similar to this:*
this.messenger = Messenger.Factory.create();

while (this.isRunning) {
    try {
        while (this.messenger.incoming() > 0) {
            final Message message = this.messenger.get();
        } catch (final Exception e) {
            LOGGER.error("Exception while receiving messages", e);

Am I missing something simple, being a Qpid newbie? Could this be
configuration in ActiveMQ? Is it normal to add a timeout and retry? Any help
to resolve this would appreciated.

(Note: I also posted this question on Stackoverflow)

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