To set JAVA_HOME environment variable, do the following:

1. Launch Terminal by pressing Ctrl+Alt+T on your keyboard.
2. Enter the following command:
   $ gksudo gedit /etc/environment
3. Depending on where you installed your Java, you will need to provide the full path. For this example, I installed Oracle JDK 7 in the /usr/lib/jvm/java-7-oracle directory.
   Scroll to the end of the file and enter the following:
   JAVA_HOME=/usr/lib/jvm/java-7-oracle
export JAVA_HOME
4. Save your file and exit gedit.
5. Lastly, reload the system PATH with the following command:
   $ . /etc/environment

The above method will save you the hassle in having to run the commands every time you log in to your computer.

You wanna make sure your Java is the default:

Set Default Java Version

Use the alternatives command to set the default java version.

~ ~↓↓$↓↓ sudo alternatives --config java

Select Java:

If your system has multiple Java versions, the above command will list all Java versions.

There are 3 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
 + 1           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.12.0.7-4.fc35.x86_64/bin/java)
   2           java-latest-openjdk.x86_64 (/usr/lib/jvm/java-17-openjdk-17.0.1.0.12-2.rolling.fc35.x86_64/bin/java)
*  3           /usr/java/jdk-17.0.1/bin/java

Enter to keep the current selection[+], or type selection number: whateverisyours

Verify Java Version

Check the java version using the following command.

~ ~↓↓$↓↓ java --version

output feks.:

java 18.0.2 2022-07-19
Java(TM) SE Runtime Environment (build 18.0.2+9-61)
Java HotSpot(TM) 64-Bit Server VM (build 18.0.2+9-61, mixed mode, sharing)

Then, add the required variables.

To set the environment variables for a particular user, place the below variables in the .bash_profile file in the home directory or in the /etc/environment file for system wide settings.

~ ~↓↓$↓↓ sudo nano /etc/environment

and your information there is current version of Java:

export PATH=$PATH:/usr/java/jdk-18.0.2/bin/
export JAVA_HOME=/usr/java/jdk-18.0.2/  

if your using JRE then it will look something like this:

export PATH=$PATH:/usr/java/jre*****/bin/
export JAVA_HOME:/usr/java/jre*****/

Test it by executing:

~ ~↓↓$↓↓ echo $JAVA_HOME
~ ~↓↓$↓↓ echo $PATH
~ ~↓↓$↓↓ java --version

For all users, I would recommend creating a file in /etc/profile.d/java_home.sh the following lines

# Set JDK installation directory according to selected Java compiler

export JAVA_HOME=$(readlink -f /usr/bin/javac | sed "s:/bin/javac::")

This will update dynamically and works well with the alternatives system. Do note though that the update will only take place in a new login shell.

Seems you are in Linux, be sure you get Java for Linux!

Set JAVA_HOME using

export JAVA_HOME=/home/z222189/jdk1.8.0_31

Does not work because java is not there, or the version is not the correct, if you already installed correct java linux version and you dont really know where your oracle-java is installed, you can find this running

which java

which will tell you which binary of java is being called, normally is something like

/usr/bin/java

but you can

readlink -f /usr/bin/java

that will give you something like

/usr/lib/jvm/java-7-oracle/jre/bin/java

ergo

export JAVA_HOME=/usr/lib/jvm/java-7-oracle/jre/

When you say "Linux global environment", do you mean Linux environment variable? If so, I think the answer is NO. Because it's not a java problem. When a process set environment var, it could only impact itself and its children process.