/usr/lib/jvm/java-1.5.0-gcj-6-amd64/man/man1/appletviewer.1.gz is in gcj-6-jdk 6.3.0-18+deb9u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/jvm/java-1.5.0-gcj-6-amd64/man/man1/../../../../../share/man/man1/x86_64-linux-gnu-gappletviewer-6.1.gz