Adapter debug vs normal problem on Intel Xeon

I am facing a problem on a Win 2K machine with Intel Xeon processor. I have configured a WM JDBC adapter to connect to a DB2 database. The adapter does not start in normal mode. It gives the following error -
(052) Could not introspect adapter class “com.wm.adapter.jdbc.JDBCAdapter”.
java.lang.ClassNotFoundException: com.wm.adapter.jdbc.JDBCAdapter

Even adding the adapter jar file to classpath in the java tab in adapter config has not helped. This works on another machine with a pentium processor. Are there any known problems with Xeon processor. Enterprise server version is 5.0.1. ADK version is 4.2. Which version is recommended.