What GC parameters is a JVM running with?

by

-XX:+PrintCommandLineFlags
Prints flags passed on command line or configured by the ergonomics (auto-sizing) features.

-XX:+PrintFlagsInitial
Dumps ALL the default flags and values.

-XX:+PrintFlagsFinal
Dumps ALL the flags after processing command line and ergonomics.

So I think the latter will do for you, just add it to your command line script.

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