There are various bad @link and @see tags in the JavaDoc comments in IdentityHashMap:

{@link System.identityHashCode instead of e.g.
{@link System#identityHashCode(Object)}

System#identityHashCode(int) instead of
System#identityHashCode(Object)

and

{@link Object.equals} instead of e.g.
{@link Object#equals(Object)}