Java -XXSoftMaxHeapSize Flag

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-XX:SoftMaxHeapSize=<bytes>  it only has an effect when the Z garbage collector is enabled
(-XX:+UseZGC).

 The GC decides it's necessary to do so to avoid OutOfMemoryError. The soft max heap size is not allowed to be set to a value greater than the maximum heap size (-Xmx). When not set on the command line, it defaults to a value equal to the maximum heap size.


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