Manoj,
Because it uses the IBM JDK, there are many issues with using WebSphere as the OTM Application Server:
- Due to issues with native memory management, it will crash often. (The same issue is encountered when running OTM on AIX using any app server.)
- It will not perform nearly as well as other platforms.
- Only a couple of clients are utilizing it, so there's a high potential for issues and bugs.
I'd highly recommend steering them towards WebLogic -- especially now that the BEA acquisition has taken place.
--Chris