如何在没有断点源的情况下在类中放置断点?

I have a web application where I need to find all classes that accesses the http request object (because one of them is causing a hard to find bug). Therefore I would like to put breakpoint in some of the methods of ServletRequest implementation. This implementation is however provided by Weblogic for which I don't have sources. How can I put a breakpoint in a class anywhere in a particular method without having it's source . The Eclipse IDE is preferred.I have a web application where I need to find a