Ok, JBoss starts without the [failed to create MQQueueManager for ''] exception 
if I set

export LD_ASSUME_KERNEL=2.4.19

in the jboss user's environment. I realised this when I tried starting JBoss as 
the mqm user and it worked. I did already have the variable set in the mqm 
user's environment, and set when installing the RPMs as root, as is required if 
the kernel is newer. I didn't set it anywhere else because I couldn't see why 
it would be needed for anything else except Websphere MQ. For example, why 
change the kernel threading model for everything else aswell? 

I guessed that as a compromise I could set it in the script that starts JBoss 
rather than set it as an environment variable, but after doing some more 
digging it appears that, as long as you have MQ fix pack 5 or later, using

export AMQ_THREADMODEL_RESET=1

for the jboss user will be enough as this sets LD_ASSUME_KERNEL=2.4.19 but has 
the advantage that the LD_ASSUME_KERNEL variable is only defined for MQ 
processes and so other applications are unaffected and can run with the new 
posix thread model.

Other things that I already had done but need to be noted are:

- make the jboss user a member of the mqm group
- set access permissions for jboss user for queue manager and queue(s)
- set LD_LIBRARY_PATH=LIBPATH=/opt/mqm/java/lib.
- make symlinks for /opt/mqm/java/lib*.jar in server/default/deploy/lib
- add MQ Series as JMS provider in server/default/deploy/jms/jms-ds.xml and 
server/default/conf/standardjboss.xml

Hope that helps someone
Cheers


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