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