java.lang.UnsupportedOperationException: Reflective setAccessible(true) disabled

Question

When I run my Ktor application with gradle run then I\'ve got the following exception:

19:21:11.795 [main] DEBUG io.netty.util.internal.logging.Int         


        

Answer 1

The access level of each object member cannot be increased anymore. The operation is not allowed anymore since Java 9 and has been hardly disabled in release 11.

You need to run this application with Java 8.

See https://www.oracle.com/technetwork/java/javase/9-relnote-issues-3704069.html (search for "setAccessible"). There is a new Object which must now be used to allow it again: https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/reflect/AccessibleObject.html