JDK-8044629 changed the behavior so that Constructor.getAnnotatedReceiverType() does not return bogus non-null values. But it seems it is a little overzealous. For local classes of non-static methods, there is a receiver type (as demonstrated by the constructors below), and so getAnnotatedReceiverType should not return null. Or perhaps javac and core reflection disagree?

Try running the demo program below with jdk8 and jdk9:
In jdk8 we get the correct output:
receiver type=sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedTypeBaseImpl@6d06d69c
receiver type=sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedTypeBaseImpl@7852e922
In jdk9 we get:
receiver type=null
receiver type=sun.reflect.annotation.AnnotatedTypeFactory$AnnotatedTypeBaseImpl@5f375618

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
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 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
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import java.lang.reflect.Constructor;

public class ReceiverType {

    public static void main(String[] args) throws Throwable {
        new ReceiverType().instanceMain();
    }

    class Member {
        Member(ReceiverType ReceiverType.this) {}
    }

    public void instanceMain() throws Throwable {
        class Local {
            Local(ReceiverType ReceiverType.this) {}
        }
        printConstructor(Local.class);
        printConstructor(Member.class);
    }

    static void printConstructor(Class<?> klazz) {
        Constructor<?>[] constructors = klazz.getDeclaredConstructors();
        if (constructors.length != 1) throw new AssertionError();
        System.out.printf("receiver type=%s%n",
                          constructors[0].getAnnotatedReceiverType());
    }
}