A very common problem faced by programmers trying to figure out where a wrong value (e.g., null) came from, and how it got to a place where it causes a failure. Eclipse (eclipse.org) is an IDE for Java. One of its features can help with the debugging problem described above, but it is very tedious to use for this purpose, and doesn\'t provide as much help as one would like. Of particular interest is providing some sort of visual display that helps with this. This project is to provide direct support for solving this problem in Eclipse, whether by creating a plug-in or by other means.