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JDK 20 - Thread.stop(), Thread.suspend() and Thread.resume() degradation”

The ability to stop, suspend, or resume a thread with the corresponding Thread.stop(), Thread.suspend() or Thread.resume() methods have been removed in JDK 20. Those methods have been degraded to throw a UOE exception (UnsupportedOperationException).

Using those methods was inherently unsafe. That is also why they were deprecated since JDK 1.2 (1998!) and were flagged ‘forRemoval’ in previous features release.

We do not expect this behavior change to cause issues on well-maintained codebase.

More information

For more details please check JDK-8289610, JDK-8249627, and the Java Thread Primitive Deprecation FAQ.

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