How to find jars not used in the project ??

[A. Lotfi]

Hi,
   
  We have a big struts project, under WEB-INF\lib we have lot of jar files, lot 
of them are not used in the code, we are using netbeans5.5, is there any 
utility to tell you which are the jar files not used in your source code.
   
  Thanks, your help is appreciated.