com/sun/jdi/EATests.java synchronizes on an Integer instance. Although this currently works, it is discouraged. See the following doc on value based classes:
https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/lang/doc-files/ValueBased.html "Synchronization on instances of value-based classes is strongly discouraged, because the programmer cannot guarantee exclusive ownership of the associated monitor. Identity-related behavior of value-based classes may change in a future release. For example, synchronization may fail." That second part is realized by Valhalla. The synchronization fails with: `java.lang.IdentityException: Cannot synchronize on an instance of value class java.lang.Integer` Valhalla CR [JDK-8372831](https://bugs.openjdk.org/browse/JDK-8372831) covers that failure, but I thought it best to address this in mainline first. Tested with all of CI tier1, tier2 svc, and tier5 svc. ------------- Commit messages: - don't sync on an Integer Changes: https://git.openjdk.org/jdk/pull/30560/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=30560&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8381609 Stats: 7 lines in 1 file changed: 1 ins; 0 del; 6 mod Patch: https://git.openjdk.org/jdk/pull/30560.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/30560/head:pull/30560 PR: https://git.openjdk.org/jdk/pull/30560
