RFR: 8369995: Implement extra logging and/or propagate errors in X509KeyManagerImpl and fix StringIndexOutOfBoundsException [v6]

[Daniel Jeliński]

On Fri, 17 Oct 2025 22:39:49 GMT, Mikhail Yankelevich <myankelevich at openjdk.org> wrote:

>> In [JDK-8309667](https://bugs.openjdk.org/browse/JDK-8309667), there were issues with debugging due to no logging or throwing of errors by X509KeyManagerImpl::getEntry. [Line](https://github.com/openjdk/jdk/blob/6a4c2676a6378f573bd58d1bc32b57765d756291/src/java.base/share/classes/sun/security/ssl/X509KeyManagerImpl.java#L243-L245)
>> 
>> Extra logging and error propagating should be implemented for the X509KeyManagerImpl.
>> 
>> Additionally, dot checking logic has been changed, so no cases similar to `.A` will not trigger StringOutOfBounds exceptions. 
>> 
>> Thank you @djelinski for finding the issue and analysis.
>
> Mikhail Yankelevich has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Artur's comments

Marked as reviewed by djelinski (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27851#pullrequestreview-3355394423