gcj-jdk software package provides gcj and classpath development tools for Java(TM), 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 gcj-jdk
gcj-jdk is installed in your system.
Make ensure the gcj-jdk package were installed using the commands given below,
$ sudo dpkg-query -l | grep gcj-jdk *
You will get with gcj-jdk package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Java |
| Package | gcj-jdk |
| Version | 4:4.7.2-1 [amd64, armel, armhf |
| Description | gcj and classpath development tools for Java(TM) |
| Sub Section | Java |