JEP 474: Generational Mode Now Standard for ZGC in Java
Briefly

Perhaps the most significant change in JEP 474 is the switch of the ZGenerational option's default value from false to true... reduce the maintenance work of supporting generational and non-generational modes alike.
This transition to the generational mode by default is motivated by the desire to reduce the maintenance work of supporting generational and non-generational modes alike... to handle the expectations of modern Java applications.
Developers should be aware that the non-generational mode is still available but deprecated... explicitly enabling non-generational mode will issue warnings.
Developers should test their applications to ensure compatibility and performance under the new default setting...
Read at InfoQ
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