Details
Description
Summary
Degrade Thread.stop()
to throw UnsupportedOperationException
(UOE) unconditionally. Deprecate the error ThreadDeath
, for removal.
Problem
Thread.stop dates from JDK 1.0 as an API to "stop" a victim thread by causing the victim thread to throw the error ThreadDeath. It is inherently unsafe with all "stop" methods deprecated since JDK 1.2 with a link to the "Java Thread Primitive Deprecation" page that explains the reasoning for the deprecation.
The recent steps on degrading and removing the feature are:
Thread.stop(Throwable) was degraded to throw UOE in Java 8 and removed in Java 11.
ThreadGroup.stop() was degraded to throw UOE in Java 19.
The remaining method is the no-arg Thread.stop(). This method is terminally deprecated since Java 18. In Java 19 it was specified to throw UOE when invoked on a virtual Thread.
Solution
Degrade the no-arg Thread.stop to throw UOE.
Deprecate ThreadDeath, for removal.
Update the specification of ThreadGroup.uncaughtException to remove its special handling for ThreadDeath.
Remove the target permission name "stopThread" from the table of names in java.lang.RuntimePermission.
The solution has no impact on the debugger APIs (JVM TI StopThread, JDWP ThreadReference/Stop, and JDI ThreadReference.stop). The debugger APIs can still be used to send an asynchronous exception as before.
Specification
A zip file with the specdiffs is attached to this CSR.
Asynchronous exceptions are described in JLS 11.1.3 and JVMS 2.10. A separate issue tracks the updates to the JLS and JVMS.
Attachments
Issue Links
- csr of
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JDK-8289610 Degrade Thread.stop
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- Resolved
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- relates to
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JDK-8293975 Degrade Thread.suspend and Thread.resume
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- Closed
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