In the page http://jakarta.apache.org/tomcat/tomcat-5.5-doc/jndi-datasource-examples-howto.html the link to the "DBCP javadocs" is broken. It could be replaced with http://jakarta.apache.org/commons/dbcp/configuration.html (describe configuration parameters) or http://jakarta.apache.org/commons/dbcp/apidocs/index.html (the bare javadocs)
*** Bug 36348 has been marked as a duplicate of this bug. ***
Looks like this has been fixed.