How to debug Java code when it is out of sync?

Question

One of the problems I'm running into is that my jar files and my source files don't match.

I'd like to:

1. Be Notified when when source and binary don't match (I think Visual Studio can do something like this...)
2. Set break points not by line, but by function. For example, set a break point at the entry of function foo().

I use eclipse mainly; so Solutions for eclipse would be most appreciated, but any IDE (or command line debugger) will do. Thanks!

Answer 1

When developing just use and link to .class files that are saved by your IDE.

If your project starts to grow to a point where it's really useful to link to a .jar you're better off treating the jar's as separate projects.