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The JAVA_HOME environment variable is used to specify the location of the Java Development Kit (JDK) installation on your computer. If this variable is not defined correctly, it can cause issues when running Java applications or compiling Java code.

To define the JAVA_HOME environment variable correctly, follow these steps:

1. Determine the installation directory of your JDK. This is typically located in the "Program Files" directory on Windows or "/usr/lib/jvm" on Linux.
2. Right-click on "My Computer" (or "This PC") and select "Properties".
3. Click on "Advanced system settings" or "Advanced" tab.
4. Click on the "Environment Variables" button.
5. In the "System variables" section, click on "New".
6. Enter "JAVA_HOME" as the variable name.
7. Enter the path to your JDK installation directory as the variable value. For example, "C:\Program Files\Java\jdk1.8.0_221" on Windows or "/usr/lib/jvm/java-8-openjdk-amd64" on Linux.
8. Click "OK" to save the changes.

After setting the JAVA_HOME environment variable, you may need to restart any open command prompt or terminal windows for the changes to take effect.