On that note, could someone recommend a tool for automatically generating the graph that shows the class dependencies/hierarchies in a Java code base? I'm sure there are good tools out there, but all the ones I tried so far (JArchitect, CodePro Analytix, SonarQube) don't seem to have a good graph layout engine.

I'd like to print out a big graph and stick it to the office walls so I'll have a good view of the logical structure.