/usr/share/binfmts/gcjcompile is in binfmtc 0.17-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3
package binfmtc interpreter /usr/bin/binfmtgcj-interpreter magic //BINFMTGCJ\x3a