[Anotaciones] Set $JAVA_HOME linux

To set JAVA_HOME environment variable, do the following:

1. Launch Terminal by pressing Ctrl+Alt+T on your keyboard.
2. Enter the following command:
   $ gksudo gedit /etc/environment
3. Depending on where you installed your Java, you will need to provide the full path. For this example, I installed Oracle JDK 7 in the /usr/lib/jvm/java-X-oracle directory.
   Scroll to the end of the file and enter the following:
   JAVA_HOME=/usr/lib/jvm/java-X-oracle
export JAVA_HOME
4. Save your file and exit gedit.
5. Lastly, reload the system PATH with the following command:
   $ . /etc/environment

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Ayuda esto también:

$ echo $JAVA_HOME

$ java -showversion