javac and generic type information lost on jdk11

gistfile1.txt

import java.util.Map;
import java.util.concurrent.Callable;

public class Oddball {
  public static void main(String[] args) throws Exception {
    Callable<Void> r =
        () -> {
          class Foo1 {
            public Map<String, Integer> field;
          }

          System.out.println("Foo1.field type: " + Foo1.class.getField("field").getGenericType());
          return null;
        };
    r.call();

    r =
        new Callable<Void>() {
          @Override
          public Void call() throws Exception {
            class Foo2 {
              public Map<String, Integer> field;
            }

            System.out.println("Foo2.field type: " + Foo2.class.getField("field").getGenericType());
            return null;
          }
        };
    r.call();

    class Foo3 {
      public Map<String, Integer> field;
    }
    System.out.println("Foo3.field type: " + Foo3.class.getField("field").getGenericType());
  }
}