Linux / Ubuntu - set system JAVA_HOME env variable
In this short article we woukld like to show how to set JAVA_HOME environment variable in Ubutnu 18.04.
Quick solution (create /etc/profile.d/jdk file with following content):
xxxxxxxxxxexport JAVA_HOME="/usr/lib/jvm/java-14-oracle"export PATH=$PATH:$JAVA_HOME/binWhere: /usr/lib/jvm/java-14-oracle should be changed to Java instalation directory path.
The approach presented in article should be working on Debian or latest Ubuntu too.
Hint: for java installed from package name ended with
*.-set-defaultpostfix,JAVA_HOMEshould be set automatically, e.g.
sudo apt-get install oracle-java14-set-default
Simple steps:
1. find java directory path:
xxxxxxxxxxls -al /usr/lib/jvm/Output:
xxxxxxxxxxtotal 32drwxr-xr-x 5 root root 4096 paź 9 14:25 .drwxr-xr-x 143 root root 4096 paź 9 14:25 ..lrwxrwxrwx 1 root root 25 lut 20 2019 default-java -> java-1.11.0-openjdk-amd64lrwxrwxrwx 1 root root 21 sty 15 2020 java-1.11.0-openjdk-amd64 -> java-11-openjdk-amd64-rw-r--r-- 1 root root 2044 lip 15 22:45 .java-1.11.0-openjdk-amd64.jinfodrwxr-xr-x 7 root root 4096 sie 18 09:56 java-11-openjdk-amd64drwxr-xr-x 9 root root 4096 paź 9 14:24 java-14-oracle-rw-r--r-- 1 root root 3559 paź 9 14:24 .java-14-oracle.jinfolrwxrwxrwx 1 root root 20 sie 3 03:16 java-1.8.0-openjdk-amd64 -> java-8-openjdk-amd64-rw-r--r-- 1 root root 2712 sie 3 03:16 .java-1.8.0-openjdk-amd64.jinfodrwxr-xr-x 7 root root 4096 sie 19 12:26 java-8-openjdk-amd64Note: we want to use:
/usr/lib/jvm/java-14-oracle(it is line 8).
2. add /etc/profile.d/jdk file with following content:
xxxxxxxxxxexport JAVA_HOME="/usr/lib/jvm/java-14-oracle"export PATH=$PATH:$JAVA_HOME/binNote: you can add it on the beginning of
/etc/profiletoo - this approach is not recommended because of messing in scripts politics.
3. rebot operating system with:
xxxxxxxxxxsudo reboot4. test JAVA_HOME variable with:
xxxxxxxxxxecho $JAVA_HOMEOutput:
xxxxxxxxxx/usr/lib/jvm/java-14-oracle
