Go to: http://tomcat.apache.org/tomcat-6.0-doc/index.html Scroll down to the link: Servlet API Javadocs - The Servlet 2.5 API Javadocs. In the HTML it points to http://java.sun.com/products/servlet/2.5/docs/servlet-2_5-mr2/index.html which oracle has so kindly made auto-redirect into http://www.oracle.com/technetwork/java/javaee/servlet/index.html which isn't the java servlet 2.5 api docs at all, and has no way to navigate to them. So... now our best options are: http://download.oracle.com/docs/cd/E17802_01/products/products/servlet/2.5/docs/servlet-2_5-mr2/ or http://download.oracle.com/javaee/5/api/javax/servlet/package-summary.html (because java ee 5 has the 2.5 servlet spec)
Fixed in 6.0.x and will be in 6.0.3 onwards. Thanks for the report and the suggested links.