/usr/share/doc/gcj-4.8-jre-lib is in gcj-4.8-jre-lib 4.8.4-2ubuntu1~14.04.4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gcc-4.8-base
/usr/share/doc/gcc-4.8-base