How to Set JAVA_HOME for All Users in Linux?

How to Set JAVA_HOME for All Users in Linux

Problem:

A new Linux user encounters multiple Java folders and receives an error regarding an undefined JAVA_HOME when trying to build a Maven project. They seek guidance on locating and modifying the necessary files for both root and non-root users.

Answer:

Step 1: Locate Java Installation

Run find /usr/lib/jvm/java-1.x.x-openjdk to find the Java installation directory.

Step 2: Set JAVA_HOME (Root User)

Edit /etc/profile using sudo vim /etc/profile and add the following lines:

export JAVA_HOME="path to Java installation directory"
export PATH=$JAVA_HOME/bin:$PATH

Step 3: Set JAVA_HOME (Non-Root User)

Run the same command (sudo vim /etc/profile) but prepend sudo. Add the same lines as in Step 2.

Step 4: Log Out and Log In

Log out and back in, reboot the system, or run source /etc/profile to apply the changes and set JAVA_HOME correctly.

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