This post explains how to install Java or check which version is running on your machine. Install on any OS, and learn about the JDK.

If Java is not recognized as internal or external command, you need to make sure that the installation is not problematic and its path is recognized as system variables.

I've installed both java and eclipse from apt-get.Following the ubuntu java instructions I've installed the IcedTea stuff on my system:sudo apt-get install icedtea-java7-jreand it seems to have ...