How to Configure JAVA_HOME for All Users in Linux?

Resolving JAVA_HOME Configuration for All Users in Linux

Introduction

As a newcomer to Linux, encountering multiple Java folders and facing errors related to JAVA_HOME can be perplexing. This guide addresses these issues by explaining the process of configuring JAVA_HOME for both root and non-root users.

Step 1: Locate Java Installation

To determine the location of the Java installation, run the following command:

find /usr/lib/jvm/java-1.x.x-openjdk

Step 2: Modify Profile for Root User

Use a text editor such as Vim to open the system-wide profile:

# For privileged users
vim /etc/profile

Step 3: Add JAVA_HOME and PATH

In insert mode, add the following lines:

export JAVA_HOME="path_to_java_location"
export PATH=$JAVA_HOME/bin:$PATH

Step 4: Apply Changes

Restart the system, log out and log in again, or use the command source /etc/profile to apply the changes immediately in the current shell.

Step 5: Configure for Non-Root Users

Step 5a: Modify Per-User Profile

For non-root users, open their user profile:

# For non-privileged users
sudo vim ~/.profile

Step 5b: Add JAVA_HOME and PATH

Add the same lines as in Step 3 to the per-user profile.

Step 5c: Apply Changes

Log out and log in again to activate the new settings.

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