Do not use APIs from the sun.* packages

The sun.* APIs are unsupported, JDK-internal APIs, and may go away at any time. The sun.misc.Unsafe.defineClass class has been removed in Java SE 11. Instead, use the supported java.lang.invoke.MethodHandles.Lookup.defineClass class.

For more information, see the Removal and Future Removal of sun.misc and sun.reflect APIs, MethodHandles.Lookup documentation.