RFR: 8373538: Migrate all tests to null-safe "SimpleSSLContext" methods [v2]

[Volkan Yazici]

On Fri, 19 Dec 2025 15:50:45 GMT, Mikhail Yankelevich <myankelevich at openjdk.org> wrote:

>> Volkan Yazici has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove wildcard imports
>
> test/lib/jdk/test/lib/net/SimpleSSLContext.java line 42:
> 
>> 40:     private static final String DEFAULT_KEY_STORE_FILE_REL_PATH = "jdk/test/lib/net/testkeys";
>> 41: 
>> 42:     private SimpleSSLContext() {}
> 
> Is there any particular reason for an empty constructor here? Can't you just remove it?

To indicate that this is a singleton and should not be instantiated. I would have preferred using an `enum` (as advised by Joshua Bloch in _"Effective Java"_), but that is a foreign practice in the OpenJDK code base, AFAICT, hence, I refrained from it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28905#discussion_r2635821557