/usr/bin/dh_javadoc
/usr/bin/gappletviewer
/usr/bin/gcj
/usr/bin/gcjh
/usr/bin/gcj-wrapper
/usr/bin/gjar
/usr/bin/gjarsigner
/usr/bin/gjavah
/usr/bin/gjdoc
/usr/bin/grmic
/usr/bin/gserialver
/usr/bin/gtnameserv
/usr/bin/jcf-dump
/usr/bin/jv-convert
/usr/bin/x86_64-linux-gnu-gcj
You may install this package on Debian with
apt-get
install gcj-jdk