java problem from attempt to use j interpreter

["Easthope" <peasthope@cablelan.net>]

peter@host:~/j601$ ./jw
java.lang.ClassCastException: java.awt.DefaultFocusTraversalPolicy
cannot be cast to javax.swing. CompatibilityFocusTraversalPolicy
   at javax.swing.JComponent.setNextFocusableComponent(libgcj.so.70)
   at jx.utils.wcc.wccx(Unknown Source)
   at jx.utils.wd0.wdexec(Unknown Source)
   at jx.utils.jnative.wd(Unknown Source)
Error  java.awt.DefaultFocusTraversalPolicy cannot be cast to
javax.swing.CompatibilityFocusTrave rsalPolicy code =
java.lang.ClassCastException: java.awt.DefaultFocusTraversalPolicy
cannot be ca st to javax.swing.CompatibilityFocusTraversalPolicy
./jw: line 2:  5327 Aborted                 /usr/bin/java -Xss6000000
-jar ${JPATHj601-~/j601}/j. jar "$@"