RFR: JDK-8276422 Add command-line option to disable finalization

[Jaikiran Pai]

On Thu, 18 Nov 2021 01:34:36 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> Pretty much what it says. The new option controls a static member in InstanceKlass that's consulted to determine whether the finalization machinery is activated for instances when a class is loaded. A new native method is added so that this state can be queried from Java. This is used to control whether a finalizer thread is created and to disable the `System` and `Runtime::runFinalization` methods. Includes tests for the above.

src/java.base/share/classes/java/lang/ref/Finalizer.java line 195:

> 193: 
> 194:     static {
> 195:         if (Holder.ENABLED) {

Hello Stuart,
My understanding of the the lazy `Holder` is that it's there to delay the static initialization of the code that's part of the `Holder`. In this case here, the `Holder` is being used right within the `static` block of the `Finalizer` class, that too as the first thing. In this case, is that `Holder` class necessary?

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PR: https://git.openjdk.java.net/jdk/pull/6442