Another thing I've just noticed about 0.20 Java.
The behaviour of the Thread that gets started when a MessageListener is
registered has changed some time between 0.12 and 0.20 (I'm afraid I was
stuck on 0.12 for a while so I can't say exactly which version it got
changed in).
In 0.12 it was a Daemon Thread, so things bombed straight out when main
exited, in 0.20 it now appears to be a user Thread and it appears to
block at the end of main and I have to ctrl C. (I think I've got Daemon
and user the right way round...)
I only really noticed this 'cause in some of the more noddy bits of code
I've put together for tinkering I put
// Blocks here until return is pressed
try {
System.out.println("Hit Return to exit");
String s = commandLine.readLine();
} catch (Exception e) {
System.out.println ("ItemConsumer: exception: " +
e.getMessage());
e.printStackTrace ();
}
To stop things exiting immediately back in the 0.12 days, but now when I
hit return the application stays running.
I doubt it's a big deal and probably actually a useful change (TBH I'm
not sure if the JMS spec says anything about this particular Thread). I
know that JBoss Messaging behaved in this way so perhaps it's a common
convention at least.
As I say I don't think that this is an "issue" with 0.20, but it is a
subtle change that affects how JMS MessageListener clients may need to
behave.
Frase
The Apache Qpid community is pleased to announce the immediate
availability of Apache Qpid 0.20.
Apache Qpid (http://qpid.apache.org) is a cross-platform enterprise
messaging solution which implements the Advanced Message Queuing
Protocol (AMQP, http://www.amqp.org). It provides brokers written in
C++ and Java, along with clients for C++, Java JMS, .Net, Python,
Ruby, and Perl.
Qpid 0.20 is available from our website:
http://qpid.apache.org/download.html
The 0.20 release includes many bug fixes and improvements. We
recommend that all users upgrade. A comprehensive list of changes in
the 0.20 release is available here:
http://qpid.apache.org/release_notes_0.20.html
Thanks to all the users and contributors who have helped to improve
Apache Qpid.
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