RFR: 8301684: Fix test code to not get finalizer deprecation warnings

[David Holmes]

On Mon, 13 Mar 2023 02:31:49 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> test/hotspot/jtreg/vmTestbase/nsk/share/ClassUnloader.java line 102:
>> 
>>> 100:      * Here it will be used for tracking the local instance of 'CustomClassLoader'.
>>> 101:      */
>>> 102:     private static class CustomClassLoaderCleaner implements Runnable{
>> 
>> nit: can you add a space before open { in these lines?
>> Also use // comments ?
>
> Just to be clear there should be a space before all opening braces in all the changes.

If you really need this class (not sure you do) then make it non-static so that it is always associated with its enclosing `ClassUnloader` instance, which can never be null.

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PR: https://git.openjdk.org/jdk/pull/12968