1) javax/xml/XMLConstants.java
Contains a broken link (pointing to http://www.w3.org/XML/xml-names-19990114-errata/ )
at line 107 (for static final String XMLNS_ATTRIBUTE_NS_URI ):
* href="http://www.w3.org/XML/xml-names-19990114-errata/">
(should be: * href="http://www.w3.org/XML/xml-names-19990114-errata">

2) javax/xml/datatype/DatatypeFactory.java
Several links error pointing to following broken fragment.

http://www.w3.org/TR/xpath-datamodel#dt-dayTimeDuration
http://www.w3.org/TR/xpath-datamodel#dt-yearMonthyDuration
http://www.w3.org/TR/xpath-datamodel#dt-yearMonthDuration

for example
line 353 (for Duration newDurationDayTime(final String lexicalRepresentation) )
* "<em>PnDTnHnMnS</em>", <a href="http://www.w3.org/TR/xpath-datamodel#dt-dayTimeDuration">
there's no #dt-dayTimeDuration in http://www.w3.org/TR/xpath-datamodel