From doccheck:

api/jdk.httpserver/com/sun/net/httpserver/SimpleFileServer.html:109: id not found: api/jdk.httpserver/com/sun/net/httpserver/SimpleFileServer.html#server-impl

Here's the relevant source code:


 * A simple HTTP file server and its components (intended for testing,
 * development and debugging purposes only).
 *
 * <p> A <a href="#server-impl">simple file server</a> is composed of three
 * components:

It's not clear whether the <a> element is an undefined reference or was intended as a definition, in which case it should be `<span id=...>`