有没有办法在类的泛型参数上使用eclipse外部注释?

我想注释vaadin的hascomponents类,它扩展了iterable。我可以这样注释迭代器()方法:

class com/vaadin/ui/HasComponents
iterator
 ()Ljava/util/Iterator<Lcom/vaadin/ui/Component;>;
 ()L1java/util/Iterator<L1com/vaadin/ui/Component;>;

这样我就可以用循环的经典迭代

for (Iterator<Component> it = content.iterator(); it.hasNext();) {
  Component c = it.next();
  doSmoething(c);
}

但当我尝试像

for(Component c : content) {
  doSomething(c);
}

我收到了来自eclipse的警告:

Null type safety (type annotations): The expression of type 'Component' needs unchecked conversion to conform to '@NonNull Component'

大概是因为

HasComponents extends Component, Iterable<@NonNull Component> 

是否有任何方法可以通过外部批注添加此批注,或者有其他方法?