RFR: 8364588: Export the NPE backtracking functionality to general null-checking APIs

[Johan Sjölen]

On Tue, 5 Aug 2025 08:32:33 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Provide a general facility for our null check APIs like Objects::requireNonNull or future Checks::nullCheck (void), converting the existing infrastructure to start tracking from a given stack site (depth offset) and a given stack slot (offset value).
>
> src/java.base/share/classes/java/lang/NullPointerException.java line 78:
> 
>> 76:     NullPointerException(int stackOffset, int searchSlot) {
>> 77:         extendedMessageState = setupCustomBackTrace(stackOffset, searchSlot);
>> 78:         this();
> 
> I thought `this()` had to come first in a constructor? Is this new in 25 or 26?

https://openjdk.org/jeps/492

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/26600#discussion_r2253816429