Javacc and jjtree - looking for working example

Hi all,
I am doing a project that requires me to have an input of some java code. It is then run through a parser to tokenize it and it is then outputted into a grammar/syntax tree. My mentor has told me that I do not need to write this part (I will be doing work on tree once it is generated), and by the looks of it the parser can be 2-5k lines of code?
Anyway, I have been looking at the examples that come with javacc and jjtree, and have those working etc. My problem is that i need to combine the two examples and i cant see anyway of doing that as the examples are vastly different. (one is a java parser the other is a 'stupid program language' tree generator, so they are using different grammars?)
So my question is: is it possible to get a already made program that takes in java code and spits out a tree on the other end? If not what steps do i need to take to make this program :S
Thanks!
Scott.

Here is a visual example
http://www.bray.com/rollover.jpg
The big picture would represent area "A"
The smaller white outline box area "B"
And area "C" would be down below
Notice the thin white lines going from top to bottom and side
to side represtent the crosshairs and will move around within the
big picture as the mouse moves. Area "B" would remain centered on
these crosshairs and would show a fullsize image of the area
immediately around where the crosshairs are located. On a mouse
click would change area "C" to pull up some detail text, photos,
etc.
The large picture will actually be a map as opposed to a pure
photo as shown here, it was just easiest to grab a photo real quick
for this visual example. I borrowed this photo from
http://www.pezcyclingnews.com/
I hope they don't mind to much.

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