RFR: 8348986: Improve coverage of enhanced exception messages [v5]

[Michael McMahon]

On Mon, 14 Apr 2025 13:51:30 GMT, Daniel Fuchs <dfuchs at openjdk.org> wrote:

>> Michael McMahon has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   update to minimise code changes
>
> src/java.base/share/classes/java/net/Proxy.java line 102:
> 
>> 100:                 formatMsg("type " + type + " is not compatible with address %s",
>> 101:                           filterNetInfo(sa.toString())
>> 102:                                .replaceWith("type " + sa.getClass().toString())));
> 
> You will have to guard against sa == null here

The `replaceWith()` call is actually not needed at all. I will remove it

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PR Review Comment: https://git.openjdk.org/jdk/pull/23929#discussion_r2044273655