there built in limitation of 2 mb ibm websphere mq jms interface.
http://www-01.ibm.com/support/docview.wss?uid=swg21221260
is there way bypass limitation?
the limitation applied wmq versions distributed @ v5.1.1 many years ago. if problem, upgrading current version of wmq resolve it. current version of wmq v7.0.1. v6.0.2 still current out of service in september of 2012. v6 & v7 can send , receive messages 100mb wmq defaults 4mb out of box. necessary tune parameters of qmgr, queues , channels if messages larger 4mb required jms not limitation @ modern versions.
the wmq java/jms manuals not mention maximum size because same native wmq max length of 100mb. however, wmq v6 performance report provides benchmarks jms messages 64mb.
whatever preventing putting 3mb message isn't limitation of wmq's jms implementation regards message size. if have checked maxmsgl on of channels , queues , qmgr it's less obvious is configuration.
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