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Michael Yang

How do I enable UseG1GC via -XX:+UnlockExperimentalVMOptions?

When trying to start my modded Minecraft server, this error pops up.

 

Error: VM option 'UseG1GC' is experimental and must be enabled via -XX:+UnlockExperimentalVMOptions.
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

 

I can't seem to figure out a way to fix it and have been searching for a while. Everytime I try to do something like -XX:+UseG1GC, it just returns the java help menu instead.

  • g1gc

  • jvm

  • minecraft

  • garbagecollection

  • java

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Ram Lakshmanan

Hello Michael!

 

 Greetings. Looks like you are running on an old version of Java. You have two options to circumvent this problems:

 

1. Upgrade your Java to 8 or above

 

or

 

2. Remove the '-XX:useG1GC' argument from the launch script

 

 Either one should resolve your problem.

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