The method
java.lang.ThreadGroup.allowThreadSuspension(boolean)
has been removed in this release. The method was used for low
memory handling in JDK 1.1 but was never fully specified. It was
deprecated and changed to "do nothing" in JDK 1.2 (released
1998).
JDK 21 Early-Access Release Notes
This is a draft of the release notes that will accompany JDK 21. The contents are subject to change until release.