To avoid mistakes if we want that a Method, Field or Nested class have a default access modifier we must add a comment at the beginning of the Method, Field or Nested class. By default the comment must be /* default */, if you want another, you have to provide a regex.

public class Foo {
    final String stringValue = "some string";
    String getString() {
       return stringValue;
    }

    class NestedFoo {
    }
}

// should be
public class Foo {
  /* default */ final String stringValue = "some string";
  /* default */ String getString() {
     return stringValue;
  }

  /* default */ class NestedFoo {
  }
}