libgcj12 software package provides Java runtime library for use with gcj, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libgcj12
libgcj12 is installed in your system.
Make ensure the libgcj12 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libgcj12 *
You will get with libgcj12 package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Libraries |
| Package | libgcj12 |
| Version | 4.6.3-1 |
| Description | Java runtime library for use with gcj |
| Sub Section | libs |