Great news! I upgrade charva (a Java Windowing Toolkit for Text Terminals) to the latest 1.1.1 release and it compiles and runs with kaffe! Just apt-get install libcharva1-java (when it'll be available because the move to main can take some days) and you'll be able to compile the examples:
$ cd /usr/share/doc/libcharva1-java/
$ ecj-gcj -nowarn -classpath /usr/share/java/charva1.jar -d /tmp/ examples/charva/* examples/java/*
$ cd /tmp
$ kaffe -classpath .:/usr/share/java/charva1.jar example.java.AppFrame
And the same in terminal mode:$ kaffe -classpath .:/usr/share/java/charva1.jar example.charva.AppFrame