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MQSeries.net Forum Index » General IBM MQ Support » Java Process hangs by using MQM 6.0

Java Process hangs by using MQM 6.0

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frankzwo

Posted: Thu Dec 22, 2005 1:38 am Post subject: Java Process hangs by using MQM 6.0

Newbie

Joined: 22 Dec 2005
Posts: 6

Hello,

i have a problem with my mqm java program. I have wrote a Java-Class to read out Messages from queue-Manager.

I use MQ 6.0 with the IBM JDB 1.4.2 under Debian Sarge.

I have imported the following files

import com.ibm.mq.*;
import com.ibm.mq.MQException;

to use some MQ Classes

The construktor of the class, i wrote , do nothing.

I call the java program every minute per cronjob in a php script like
exec("cd /home/user/mq/; java -cp /usr/share/java/com.ibm.mq.jar de.company.team.server.class)

Sometime (in 2-3 hours one time) the process hangs, if the constructor of my Class is called. the java-program does not continues

Have you any solutions for this problem.

Thanks, and sorry for my bad english

Frank

jsware

Posted: Thu Dec 22, 2005 4:56 am Post subject:

Chevalier

Joined: 17 May 2001
Posts: 455

Some of these links are for MQ 5.3 and not on Debian Linux, but they might be appropriate to MQ V6 too.

The following link http://www-1.ibm.com/support/docview.wss?rs=171&context=SSFKSJ&q1=Java+hangs&uid=swg21109644&loc=en_US&cs=utf-8&lang=en suggests switching off the JIT compiler.

The following link http://www-1.ibm.com/support/docview.wss?rs=171&context=SSFKSJ&q1=Java+hangs&uid=swg21175023&loc=en_US&cs=utf-8&lang=en suggests exporting AMQ_NO_SIGWAIT_SIGTRAP=1 to stop WMQ blocking the SIGWAIT/SIGTRAP signals which the JVM on AIX uses when loading libraries. This link http://www-1.ibm.com/support/docview.wss?uid=swg1IY43961 includes an APAR about the same thing.

If these don't help, you could try search IBM's support section at http://www-306.ibm.com/software/integration/wmq/support/ which is where I found the above links when searching for "Java Hangs"
_________________
Regards
John
The pain of low quaility far outlasts the joy of low price.

frankzwo

Posted: Thu Dec 22, 2005 5:34 am Post subject:

Newbie

Joined: 22 Dec 2005
Posts: 6

thank you very much for your help.
i`ll try this out . If it works, i will be very happy

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