Im using JMS Pub-Sub model and sometimes i see a strange scenario ,where the message gets published to JMS topic ,there is no trace of subscriber instance for sometimeand later on the instance shows JMS subscribers picking it up and completes after 3 or 4 hours which normally takes minutes.
No changes were done at configuration or coding level.
Please help with your inputs .
Is your JMS server a JDBC or a filestore? Is it hosted on the same server as SOA server?
Have you tried to increase the logger level to trace:32 and see what's in the logs?
Any exceptions/errors? Looking into logs could help understand the behavior.