A set of Hello World JSP tutorial:

Basic JSP web page tutorial: http://chackboom.blogspot.com/
Simple JSP Ajax Tutorial: http://simpleajaxjsp.blogspot.com/
JSP JDBC Tutorial: http://jspjdbc.blogspot.com/
Grails Turorial: http://grailsinstall.blogspot.com/
Basic Authentication(Tomcat & MySQL): http://basicauth.blogspot.com/
Liferay Tutorial: http://liferayhello.blogspot.com/
Axis2 Webservice Hello World: http://axis2hello.blogspot.com/
XML attachment: http://xmlattach.blogspot.com/
Xen VPS virtual hosting: http://xenaccount.blogspot.com/