This appears to be a long-standing but nevertheless significant bug in the doclet.

`@see member` will cause a See Also to be generated even when the referenced member is not being documented. This creates a broken link.

For example, look at various members in java.awt.BorderLayout, which have
     * @see #getChild(String, boolean)
But here is the definition of getChild:
    private Component getChild(String key, boolean ltr) {

Now look at https://docs.oracle.com/javase/8/docs/api/serialized-form.html#java.awt.BorderLayout
Setting aside that it is regrettably necessary to document internal fields, these fields have a See Also to undocumented methods, like BorderLayout::getChild

The same problem continues to exist on JDK 9
avase/9/docs/api/serialized-form.html#java.awt.BorderLayout

While one might try and dismiss the importance of the serialized-form page, the fact that the doclet is creating broken links is a big deal, since it diminishes the effectiveness of link checkers.