You can find a link to it at
The msmq component was very hard to maintain and support. There are commercial companies who offers adapters from Java to MSMQ. You may want to look at those as an alternative in case the MSMQ component doesn't work out for you.
Any recommendations for such adapters? Looking around on the net, there's not much out there.
The only way I managed to connect Java to MSMQ in anywhere near a reliable fashion was by using J-Interop (http://j-interop.org/), which implements the DCOM over the wire protocol and thus avoids the JNI trap altogether.