[Solved] Unrecognized VM option 'UseConcMarkSweepGC' When Running the main() in IntelliJ IDEA

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There is an old Java project. After I upgrade the version of JDK from 8 to 21 in IntelliJ IDEA, and run the main() method in IntelliJ IDEA, an error occurs.

The error message

Abnormal build process termination: 
nice -n 10 ...
Unrecognized VM option 'UseConcMarkSweepGC'
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

Solutions

Remove the unrecognized VM option ‘UseConcMarkSweepGC’ in IntelliJ IDEA.

  1. Open Settings.
  2. Click “Build, Execution, Deployment”, and click “Compiler”.
  3. To find “Build process > Shared VM options”.
  4. Remove “-XX:+UseConcMarkSweepGC”.
  5. Click the “OK” button.