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changing the `java_home` environment variable in ubuntu is essential if you have multiple java versions installed or if you want to ensure your system uses a specific version of java. below is a detailed tutorial on how to change `java_home` on an ubuntu system.

step 1: check installed java versions

first, you need to check which versions of java are installed on your system. open a terminal and run:



this command will list all installed java versions. the output will look something like this:



step 2: identify the java installation path

the `java_home` variable should point to the directory where java is installed. you can find the installation path of your desired java version using the `readlink` command. for example, if you want to find the path for java 11, you could run:



this will return a path that looks like this:



to set `java_home`, you only need the parent directory:



step 3: set java_home

you can set the `java_home` variable temporarily in your terminal session, or you can set it permanently.

temporary setting

to set `java_home` temporarily (it will be reset when you close the terminal), run:



you can verify that it is set by running:



permanent setting

to set `java_home` permanently, you'll need to add it to your profile file. this can be done by editing the `.bashrc` file for your user or the `/etc/environment` file for system-wide settings.

1. *edit .bashrc (user-specific)*

open the `.bashrc` file in your home directory:



add the following line at the end of the file:



save the file (ctrl + o, enter, ctrl + x to exit).

to apply the changes, run:



2. *edit /etc/environment (system-wide)*

to set `java_home` for all users, edit the `/etc/environment` file:



add the following line:



save and exit the file. you may need to log out and log back in, or restart the system for the changes to take effect.

step 4: verify java_home

to confirm that `java_home` has been set correctl ...

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