java.lang.Thread.stop(java.lang.Throwable) has been deprecated for a long time [0] and threw UnsupportedOperationException. In OpenJDK 11, it has been removed.

When
a Java class uses java.lang.Thread.stop(java.lang.Throwable)

Perform
add a hint to replace this with a strategy based on signalling via a shared variable or calling java.lang.Thread.interrupt on the thread to notify it to stop

[0] https://docs.oracle.com/javase/7/docs/technotes/guides/concurrency/threadPrimitiveDeprecation.html