Hi!

Demeter/C++ and Demeter/Java may be used freely without signing
a license agreement. See
http://www.ccs.neu.edu/research/demeter/sources/DemeterJava/NUDCopyright.html
for details.

You asked for Tex macros for class and object graphs.
Demeter/Java contains a tool for drawing class graphs in UML form.
See:
http://www.ccs.neu.edu/home/kedar/
When we switch to JDK 1.1, you will be able to print them as postscript files
directly. Currently we use a workaround for printing.

Also, Tendril Software (http://www.tendril.com/tendril.html) offers a 
commercial tool
to translate your Java code into a UML class diagram or to manually draw UML
class diagrams. 

-- Karl