Subject: Set the JAVA_HOME Environment Variable
Author: Linux
In response to: Manage Different Versions of Java
Posted on: 10/20/2017 12:55:07 AM
Many java applications need to know where to load the JDK based on environment parameter JAVA_HOME
We can set it inside file /etc/environment:
$ sudo nano /etc/environment
Add at the end of file with this line:
JAVA_HOME="/usr/local/java/jdk1.8.0_152"
Save and exit the file, and reload it (or logout and login):
$ source /etc/environment
You can now verify it:
$ echo &JAVA_HOME
/usr/local/java/jdk1.8.0_152
>
> On 10/20/2017 12:44:41 AM
Linux wrote:
Now the Ubuntu box has at least two versions of Java: the default openJDK & Oracle JDK. Here is how to manage what is to be used.
$ sudo update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).
Selection Path Priority Status
------------------------------------------------------------
* 0 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 auto mode
1 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081 manual mode
2 /usr/local/java/jdk1.8.0_152/bin/java 100 manual mode
Press <enter> to keep the current choice[*], or type selection number: 2
update-alternatives: using /usr/local/java/jdk1.8.0_152/bin/java to provide /usr/bin/java (java) in manual mode
Here we chose Oracle JDK1.8 and linked it to /usr/bin/java
References:
