I had COM.IBM.MQ.JAR and other required jar files defined in my CLASSPATH, but I was getting almost the same error.
Make sure all these required jar files are added to the lib in your development env ...
I had MQ server already installed on my workstation and then I installed
WSAD and both are working fine.
In one incident when I tried to install MQ server on a workstation that had
WSAD (Websphere ...