How Do I Set Java Environment Variables in Windows?

How to Set Environment Variables for Java in Windows

To set environment variables for Java in Windows, follow these steps:

Setting User Environment Variables

1. Open Control Panel and navigate to "System and Security > System."
2. Click on "Advanced system settings" and then on the "Environment Variables" button.
3. Under "User variables," create or modify the following variables:

• JAVA_HOME: Set to the installation directory of the Java Development Kit (JDK).
• JDK_HOME: Set to ${JAVA_HOME}.
• JRE_HOME: Set to ${JAVA_HOME}/jre.
• CLASSPATH: Set to .%;${JAVA_HOME}/lib;${JAVA_HOME}/jre/lib.
• PATH: Add ${JAVA_HOME}/bin to the beginning of the path. Ensure there are no other references to Java installation folders.

Optional Recommendations

1. Create a user environment variable JAVA_TOOL_OPTIONS with the value -Dfile.encoding="UTF-8" to set the default character encoding to UTF-8.
2. Remove the entry C:ProgramDataOracleJavajavapath; from the system environment variable Path if it exists to ensure consistency in the environment setup.

Troubleshooting

• If Java commands do not work, restart the command prompt or terminal for the changes to take effect.
• Verify the values of the environment variables to ensure they point to the correct locations.
• If you encounter any other issues, refer to the Java documentation or consult with a Java developer.

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