Fix Java Version Switching Not Working

If the Java version switch is not working, it may be due to the following reasons:

1. There is an error in the system environment variable configuration: please check if JAVA_HOME and Path are correctly set in the system environment variable. JAVA_HOME should point to the correct Java installation directory, and the Path should include the path to %JAVA_HOME%\bin.
2. Incorrect IDE or editor configuration: If you are using an IDE or editor for Java development, some tools may have their own Java version settings. Make sure that the Java version settings in your IDE or editor match the version you want to use.
3. Other program conflicts: Sometimes, other programs may have their own Java environment variables set, causing the Java version switch to not work. You can try closing these programs or reconfiguring their environment variables.
4. Operating system permissions issue: If you are using Windows, you may need to run the command line tool as an administrator or modify system environment variables.

If you have checked the above points but the issue still persists, you can try the following solutions:

1. Reinstall Java: Try reinstalling Java and make sure to configure the environment variables correctly.
2. Manually specify the Java version by using the full path of the Java executable file in the command line. For example, “C:\Java\jdk1.8.0_221\bin\java”.
3. Utilize Java version management tools like jEnv and sdkman to easily switch between different Java versions.

I hope the solutions above can help you with the issue where Java version switching is not working. If the problem persists, please provide more details and error information so that we can better assist you in resolving the issue.