libgcj16-dbgsym 5.4.1-5ubuntu2 (amd64 binary) in ubuntu zesty

 This is the runtime that goes along with the gcj front end to
 gcc. libgcj includes parts of the Java Class Libraries, plus glue to
 connect the libraries to the compiler and the underlying OS.
 .
 To show file names and line numbers in stack traces, the packages
 libgcj16-dbg and binutils are required.