RFR: 8374523: [BACKOUT] Move input validation checks to Java for java.lang.StringCoding intrinsics

[Aleksey Shipilev]

On Tue, 6 Jan 2026 08:16:16 GMT, Volkan Yazici <vyazici at openjdk.org> wrote:

> Back out `java.lang.StringCoding` changes delivered in [JDK-8361842] (#25998 & 655dc516c22), which causes regressions reported in [JDK-8374210].
> 
> [JDK-8361842]: https://bugs.openjdk.org/browse/JDK-8361842
> [JDK-8374210]: https://bugs.openjdk.org/browse/JDK-8374210

This does not look like a clean backout -- the incoming/outgoing line counts do not match against the original commit -- so extra caution is needed in reviews.

Apart from the inadverent (?) addition in `JavaLangAccess.java`, there seem to be hunk differences in some `sun/nio/cs` files; I assume those are intentional?

src/java.base/share/classes/jdk/internal/access/JavaLangAccess.java line 455:

> 453:      * compatible.
> 454:      * <p>
> 455:      * <b>WARNING: This method does not perform any bound checks.</b>

These two lines are not in the original commit?

https://github.com/openjdk/jdk/commit/655dc516c22ac84fccee6b1fdc607c492465be6b#diff-bd92d760986b9249dd3c02cc147db4f7e9dbbef90afef4971ee497a50e48c740

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PR Review: https://git.openjdk.org/jdk/pull/29055#pullrequestreview-3630055594
PR Review Comment: https://git.openjdk.org/jdk/pull/29055#discussion_r2664196789