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2020-01-22 Legacy Launcher issue

Trying to fix Harena's launcher...

"Duplicate key" problem

This resulted in a loading attempt where the progress bar got all the way to the end (right) before the next error happened:

"Option UseConcMarkSweepGC was deprecated" error

OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
Unrecognized VM option 'CMSIncrementalMode'
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.
  • This page suggests modifying JVM arguments:
    • H's old settings: -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
    • Poster's old settings: -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
    • Poster's new settings: -Xmx1G -XX:+UseConcMarkSweepGC -XX:-UseAdaptiveSizePolicy -Xmn128M