How to increase Java runtime maximum heap memory?

[CaffeineAddict]

The following output is excerpt from command: java -XshowSettings

VM settings:
Max. Heap Size (Estimated): 3.86G
Using VM: OpenJDK 64-Bit Server VM

This according to my understanding means that Java applications will be limited to 4GB of memory, however my system has 16GB and I want to increase it to at least 8GB because I need it for a game.

My attempt so far was this:
According to man java we can specify -Xmx option to specify max Heap Size and -Xms option to specify minimum size, so I entered the following into my .bashrc:

export JAVA_OPTS="-Xms6G -Xmx8G"

However this doesn't work, obviously because reported max is 4GB from the output of java -XshowSettings
How do I properly modify these settings?

I'm on Debian.

 

[dos2unix]

you can specify the heap size directly when running your Java application:

java -Xms6G -Xmx8G -jar your-application.jar

You can put this in a bash shell script or systemd service file to launch your application.

 

[CaffeineAddict]

you can specify the heap size directly when running your Java application:

The game is written in Kotlin language and is run from Lutris.
I'll see if I can adjust cmd-line parameters in Lutris, but I'm afraid I won't see if the setting will take effect.
thanks!

 

[dos2unix]

The game is written in Kotlin language and is run from Lutris.

In that case, I suspect these are compiled with something like gradle or maven
and the parameters would be compiled into the launcher.