In one of my project I am using JSF 1.1.5 with Web Logic 8.1 SP6. I am getting below exception, when I hit the application first time. After that application is working as expected.
And the same application works on Tomcat 5 smoothly;no exception at all.
Try placing commons collection in the class path. Or you can set a break point at the line where this error occurs and use the Display window in eclipse to load the offending class with Class.forName(). That will verify if the problem is due to a ClassNotFoundException