Update stale external javadoc links

Certain external javadoc links were broken or out of date, namely
Hibernate, Java SE and EE 6, Quartz, and Apache Pluto. All resolve
properly now.

Issue: SPR-8720

build-spring-framework/build.xml

@@ -41,15 +41,15 @@
 
 	<presetdef name="javadoc.links">
 		<javadoc>
-			<link href="http://java.sun.com/javase/6/docs/api"/>
-			<link href="http://java.sun.com/j2ee/1.4/docs/api"/>
+			<link href="http://download.oracle.com/javase/6/docs/api"/>
+			<link href="http://download.oracle.com/javaee/6/api"/>
 			<link href="http://aopalliance.sourceforge.net/doc"/>
 			<!-- Caucho Burlap/Hessian -->
 			<link href="http://cglib.sourceforge.net/apidocs"/>
 			<!-- EasyMock -->
 			<link href="http://ehcache.sourceforge.net/apidocs"/>
 			<link href="http://freemarker.sourceforge.net/docs/api/"/>
-			<link href="http://www.hibernate.org/hib_docs/v3/api"/>
+			<link href="http://docs.jboss.org/hibernate/core/3.6/javadocs/"/>
 			<!-- iBATIS -->
 			<!-- iText -->
 			<!-- Commons Attributes -->
@@ -69,8 +69,8 @@
 			<link href="http://logging.apache.org/log4j/docs/api/"/>
 			<link href="http://jakarta.apache.org/regexp/apidocs/"/>
 			<link href="http://jakarta.apache.org/poi/apidocs/"/>
-			<link href="http://portals.apache.org/pluto/multiproject/portlet-api/apidocs/"/>
-			<link href="http://www.opensymphony.com/quartz/api/"/>
+			<link href="http://portals.apache.org/pluto/portlet-1.0-apidocs/"/>
+			<link href="http://www.quartz-scheduler.org/api/2.1.0/"/>
 			<link href="http://struts.apache.org/struts-doc-1.2.9/api/"/>
 			<link href="http://java.sun.com/javase/6/docs/jre/api/net/httpserver/spec/"/>
 			<link href="http://tiles.apache.org/framework/apidocs/"/>