Summary

Update java.lang.invoke.VarHandle as a sealed class

Problem

As specified in the class specification, VarHandles cannot be subclassed by users. It does not have public constructor.

Solution

Make java.lang.invoke.VarHandle a sealed class.

Specification

-public abstract class VarHandle implements Constable {
+public abstract sealed class VarHandle implements Constable

All permitted classes are package-private and not listed in the above specification change. The javadoc of VarHandle shows that it's a public abstract sealed class without the permits clause.