I am working on a Java plugin. My source imports source from two other
packages. One is the source for org/eclipse/jdt/core. The other is a
third-party package, net.sourceforge.metrics-1.3.5. After several days, I
still don't get it. I've tried unzipping them and "importing" them into
the workspace, leaving them outside the workspace, etc. etc. How can my
project reference these source files?