https://docs.oracle.com/javase/9/tools/javadoc.htm#JSWOR-GUID-9D532574-1CDB-4D30-99F3-A308DCAEE55F
refers to "extdocURL" without explaining what that is.
It looks like
-link url
was intended to be
-link extdocURL
refers to "extdocURL" without explaining what that is.
It looks like
-link url
was intended to be
-link extdocURL