Common Queue Problem

Question

Hi all,
I have a messaging queue on my server side. I am using this queue for an asynchronous operation on server side. My problem starts when I want to listen this queue on client side. I am getting the following exception when i try to listen same queue;
javax.jms.JMSException: A message listener is already registered
Yes its right i assigned a listener by creating a MD bean
How can i listen this common queue from client side too ?
Thank you for your attention,
My Regards

Answer 1

Hi,
Hanging PL/SQL jobs and hanging external jobs need to be treated differently.
- hanging pl/sql jobs are typically associated with a real background session which is hanging and issues can be tracked down using normal tools/methods to track down oracle hangs (see what sql statement is being run, see what locks are being held/waited on etc).
- hanging external jobs may be the result of a hanging script or may be hanging because the external job never returned results. Both of these issues are covered in the post on running external jobs here
Guide to External Jobs on 10g with dbms_scheduler e.g. scripts,batch files
First check whether the script is running (look through the process list for the name of the script or the commands that the script runs).
If it is, then you need to debug the script itself or you may be running into the bug where the scheduler hangs on large amounts of stderr (fixed in version 10.2.0.2) in which case you should redirect stderr to a file.
If nothing is running then you should check your permissions, in particular, the user that the job runs as must have execute access on $ORACLE_HOME/bin and all parent directories. So for e.g. if your $ORACLE_HOME is /opt/oracle/db then you would have to make sure that
chmod a+rx /opt
chmod a+rx /opt/oracle
chmod a+rx /opt/oracle/db
chmod a+rx /opt/oracle/db/bin
Hope this helps,
Ravi.