Is there any tool that can compare relevant java code in two branches ?

[Tomas]

Does anyone here know if it exists some tool that can generate html
pages that illustrate all relevant (! , see comment below) differences
between two branches and can take the following inputs:
* The two branches
* A java method (or class)

What I mean by using the word relevant above is that I do not want to
see all of the changes in the branches but only those changes that may
affect the java method or class that I provide as input, so the tool
will have to understand how to follow java code and to then compare
the relevant parts of the code in the two cvs branches.

For example, if I provide the method A.a1 (method a1 in class A) as
input to such a tool then that method might invoke for example B.b1,
B.b2, C.c1, C.c2, and for example the method C.c1 might invoke the
method D.d1 and that method might have changed between the two
branches and that is the kind of difference which I would like to
capture automatically without having to manually trace all used
classes and do the comparisons (for example in eclipse) manually.

Regards, Tomas