Annotations on Java8 default are not available in Generator

Hi,

I'm a user of the gwt-jackson library and I've just found the following bug:

https://github.com/nmorel/gwt-jackson/issues/160

To fix it, I need to get access of the annotations on a default Java8 method interface:

    public static interface InterfaceBean {
        @JsonIgnore
        default String getName(){
            return "defaultName";
        }
    }

But tell me if I'm wrong, GWT doesn't provide this information!

I did setup a minimal demo project to explain the issue:

https://github.com/freddyboucher/gwt-java8-default-method-interface

As you see the default `getGender` method is not listed in neither HasGender or Person JClassType

public interface HasGender {
  @Nonnull
  default String getGender() {
    return "male";
  }
}

public class Person implements HasGender {
  @Nonnull
  public String getName() {
    return "Paul";
  }
}

public class CustomGenerator extends Generator {


  @Override
  public final String generate(TreeLogger logger, GeneratorContext context, String typeName) throws UnableToCompleteException {
    JClassType genderType = context.getTypeOracle().findType(HasGender.class.getName());
    assert genderType.getMethods().length == 0;
    assert genderType.getInheritableMethods().length == 0;
    assert genderType.getOverridableMethods().length == 0;


    JClassType personType = context.getTypeOracle().findType(Person.class.getName());
    assert Arrays.equals(new String[] { "getName" }, Arrays.stream(personType.getMethods()).map(JAbstractMethod::getName).toArray());
    assert personType.getMethods()[0].isAnnotationPresent(Nonnull.class);


    String[] common = { "equals", "finalize", "getClass", "getName", "hashCode", "toString" };
    assert Arrays.equals(common, Arrays.stream(personType.getInheritableMethods()).map(JAbstractMethod::getName).toArray());
    assert Arrays.equals(common, Arrays.stream(personType.getOverridableMethods()).map(JAbstractMethod::getName).toArray());
    return null;
  }


}

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