There are a number of broken links in javadoc. Jon Gibbons has provided the following output for the three modules with issues:

http://cr.openjdk.java.net/~jjg/doc-report/jdk-by-module/javafx.controls/links.log
http://cr.openjdk.java.net/~jjg/doc-report/jdk-by-module/javafx.graphics/links.log
http://cr.openjdk.java.net/~jjg/doc-report/jdk-by-module/javafx.media/links.log