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Every tutorial I've read about setting java_home environment variable via gedit just says "save and exit" save to where?
Can I save this particular gedit file as such /home/nexogen/developer/gedit_java
Or must I save this gedit file to /usr/lib/jvm/java-8-oracle
as in save the gedit file which contains the java_home environment variable command in the same directory as jave_home itself
I think I have understand your problem. You're opening /etc/environment file as normal user and then cannot save the file at that place.
You won't open it as normal user. Instead you'll open as root user. To do so, First open a terminal by pressing Ctrl-Alt-T keyboard shortcut.
Then write this command there to open as root
sudo -i gedit /etc/environment
This will open the file as root.
JAVA_HOME is an environment variable. It is set to a directory containing JDK installation like this line
JAVA_HOME=/usr/lib/jvm/java-8-oracle
I assumed jdk is in /usr/lib/jvm/java-8-oracle folder.
You'll add this line at the end of that file and save by pressing Ctrl-S. This will overwrite the file at place. You don't need to save this file anywhere else as you opened this as root
Now exit gedit.
Logout and login again to see the effect of setting JAVA_HOME.
Well I recommend you to add the following in the file /etc/profile so that the java path could be usable system-wide. JAVA_HOME and PATH variable can be set as follows : Open up a terminal
sudo nano /etc/profile
At the following statements at the bottom of the file , I am assuming your java extracted folder is at /usr/lib/jvm/java-8-oracle
JAVA_HOME=/usr/lib/jvm/java-8-oracle
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
JRE_HOME=/usr/lib/jvm/java-8-oracle/jre
PATH=$PATH:$HOME/bin:$JRE_HOME/bin
export JAVA_HOME
export JRE_HOME
export PATH
Save the file by pressing Ctrl + x y enter
Better give read and execute permission for the Java installation folder as follows :
sudo chmod -R a+rx /usr/lib/jvm/java-8-oracle
I also recommend to update alternative for all the application to use java when required as follows :
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/java-8-oracle/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/java-8-oracle/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/java-8-oracle/bin/javaws" 1
sudo update-alternatives --set java /usr/lib/jvm/java-8-oracle/bin/java
sudo update-alternatives --set javac /usr/lib/jvm/java-8-oracle/bin/javac
sudo update-alternatives --set javaws /usr/lib/jvm/java-8-oracle/bin/javaws
Now reload the profile file we have updated as follows in the terminal.
Note: There is a space between . and /etc/profile in the below command.
. /etc/profile
That's it
