How Do I Set JAVA_HOME in Linux?

Understanding JAVA_HOME Environment Variable in Linux

When working with Java in Linux, it's essential to set the JAVA_HOME environment variable to point to the Java Development Kit (JDK) installation directory. This variable allows applications to locate the necessary Java libraries and executables.

Common Issue and Resolution

When encountering errors like "JAVA_HOME is not defined correctly," it's often due to an incorrect JAVA_HOME setting. Here's how to correctly set JAVA_HOME for all users:

1. Locate Java Installation Directory:

• Run the command: find /usr/lib/jvm/java-1.x.x-openjdk
• Copy the path to the Java installation you want to use.

2. Modify Profile File for Root User:

• Open the /etc/profile file as root.
• Add the following lines:

export JAVA_HOME="path_that_you_found (e.g. /usr/lib/jvm/java-1.x.x-openjdk)"
export PATH=$JAVA_HOME/bin:$PATH

3. Apply Changes for Non-Root Users (Optional):

• Open the /etc/profile file as the non-root user with sudo privileges.
• Add the same lines as above.

4. Apply Changes:

• Restart the system or logout and log back in to make the changes effective.
• You can also run source /etc/profile to apply the changes in the current shell immediately.

Verification:

• After applying the changes, run java -version to verify if JAVA_HOME is correctly set.

By following these steps, you can ensure that all users on your Linux system have the correct JAVA_HOME setting, allowing Java applications to function smoothly.

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