gcj-mips64-linux-gnuabi64 software package provides GNU Java compiler (based on GCC) for the mips64 architecture, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gcj-mips64-linux-gnuabi64
gcj-mips64-linux-gnuabi64 is installed in your system.
Make ensure the gcj-mips64-linux-gnuabi64 package were installed using the commands given below,
$ sudo dpkg-query -l | grep gcj-mips64-linux-gnuabi64 *
You will get with gcj-mips64-linux-gnuabi64 package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Development |
| Package | gcj-mips64-linux-gnuabi64 |
| Version | 4:6.1.1--2 |
| Description | GNU Java compiler (based on GCC) for the mips64 architecture |
| Sub Section | devel |