I ran into this while testing https://bugs.openjdk.java.net/browse/JDK-8062373.

This is however low priority, just so we have a record of it, I have created a ticket.

While compiling the following program:

final class F<T> {}

public class X {
    F f = new F<String> () { };
}

we emit two error messages:

/home/srikanth/tmp/X.java:4: error: cannot inherit from final F
    F f = new F<String> () { };
              ^
/home/srikanth/tmp/X.java:4: error: cannot inherit from final F
    F f = new F<String> () { };
               ^
2 errors

one from hierarchy phase and and the other from headers phase.

When anonymous classes are not involved, the two error messages
have the same co-ordinate pair and so the second one is discarded.

Not so while dealing with anonymous classes.