We routinely CTW 3rd party JARs to make sure our compilers work. By the nature of them, a lot of JARs have dependencing on other JARs, and CTW runner frequently warns out with NCDFE. It does so very crudely, missing opportunities to compile the methods that _do not_ trigger NCDFEs. CTW should be made more tolerant to this. I think the normal "modules" CTW runs into the similar problem, but on a lesser scale, as we do not have a very hairy dependency graph within JDK.