Avoid `java_import`s since they can introduce name conflicts.

Particularly, the top-level import of log4j's `Logger` is giving us
grief.  Fool me once, shame on you!  Instead of waiting for the next
conflict, just kill them all.

Also use ruby-style namespace navigation for java types rather than
the java dot-syntax: those dot chains are method calls & cane objects
to the ABC complexity.