I have a huge Java Application with numerous packages. Some of the classes in these packages have dependency on classes in other packages. Given a class, I want to know all
Another option is Degraph: https://github.com/schauder/degraph (I'm the author, so this is obviously a shameless plug)
You can test JavaDepend, it provides many useful features for dependency needs.
I would also recommend Eclipse as there are various plugins for this task. For example ispace which can create a graphical representation of the package dependencies.
I general the Source code analyzer section of eclipse's market place has more plugins in that direction.
There's some useful tools described here for the (free) Eclipse IDE. There's also more info on dependency tools with a comparison against depfinder here.
CDA - Class Dependency Analyzer is incredibly simple to use, and can help you visualize those dependencies between packages and classes.