RFR: 8309196: Remove Thread.countStackFrames

[Iris Clark]

On Thu, 1 Jun 2023 06:40:04 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> Thread.countStackFrames is/was an ill-defined method that dates from JDK 1.0 for counting the stack frames of a suspended Thread. The method was deprecated in JDK 1.2 (1998), deprecated for removal in Java 9, and re-specified/degraded to throw UOE unconditionally in Java 14.  Java 22 would be a fine time to finally remove this method.
> 
> Code that wants to count stack frames should be directed to use j.l.StackWalker, or if is a a tool, then it can use JVM TI and other tool APIs.
> 
> A corpus analysis of 30M classes in 131k artifacts from Maven Central found only 1 usages to this method. The 1 usage appears to be a class that just wraps all methods, it doesn't actually make use of it.

Happy to see this being removed early in JDK 22!

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Marked as reviewed by iris (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/14257#pullrequestreview-1456700929