java.lang.ClassNotFoundException: javassist.ClassPool

[Anil kumar Sakala]

1) Downloaded struts2-2.2.1-all
2) Using import from eclipse IDE I imported struts2-blank-2.2.1.war
3) Deployed in weblogic and started weblogic.

I got the following error during start up
java.lang.ClassNotFoundException: javassist.ClassPool

These are the libs included in WEB-INF/lib folder

commons-fileupload-1.2.1.jar
commons-io-1.3.2.jar
freemarker-2.3.16.jar
javassist-3.7.ga.jar
ognl-3.0.jar
struts2-core-2.2.1.jar
xwork-core-2.2.1.jar

I am struggling with this error from 2 days.
Please help.

[Joe Ess]

I did a quick search of Struts 2.2.1 source and couldn't find any reference to a class named ClassPool.
If you just want to resolve the dependency, the class appears to originate here, but you should probably figure out where that dependency is coming from.