newb: How to determine package dependencies from one jar?

Is there a way to use the bcel, to go through a jar and determine that
biz.xsoftware.router depends on biz.xsoftware.model?  I basically want
to go through all the class files in biz.xosftware.router package and
see if any depend on any classes in the bix.xsoftware.model.

 

Where do I bootstrap the bcel to load the jar that I want to introspect?
I basically want to go through all the packages in that one jar.  Do I
have to load all the classes individually first using ClassParser and
parsing every one, or is there a class I am missing that will give me
JavaClass array from the jar?

 

Thanks for any pointers in the right direction,

dean