How to add JAVA_HOME on Ubuntu?
On Ubuntu, we can add JAVA_HOME environment variable in /etc/environment file.
Note
/etc/environment system-wide environment variable settings, which means all users use it. It is not a script file, but rather consists of assignment expressions, one per line. We need admin or sudo to modify this it.
Further Reading Ubuntu – EnvironmentVariables
1. JAVA_HOME
1.1 Edit /etc/environment file with a text editor like vim or nano, need root or sudo.
$ sudo vim /etc/environment
1.2 Add JAVA_HOME at the next line, and points to a specified JDK folder directly.
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"
JAVA_HOME=/usr/lib/jvm/adoptopenjdk-11-hotspot-amd64
1.3 Reflect the changes in the current session.
$ source /etc/environment
$ echo $JAVA_HOME
/usr/lib/jvm/adoptopenjdk-11-hotspot-amd64
Note
The new changes will disappear if we close the current session or reopen a new terminal because a new shell does not trigger the /etc/environment. Try to restart the Ubuntu or login again; the new changes in /etc/environment will apply automatically.
References
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