Have solved the problem. Solutions follows
Step 1: double click on "WebSphere Application Server v8.5 at localhost" configured in RAD
Step 2: uncheck "Start Server with a generated script"
Thats it. It worked for me.
IBM WebSphere cannot start in RAD 9.1
原文：http://www.cnblogs.com/uu5666/p/7596779.html