If you are upgrading from WebSphere Business Integration Adapters version 2.3.1, you should be running WebSphere Application Server Enterprise Edition 5.0. To upgrade, apply WebSphere Application Server Enterprise Edition 5.0 Fix Pack 2. This is available from the following web site:
http://www.ibm.com/support/docview.wss?rs=180&tc=SSEQTP&uid=swg24005055