Java Web Application Framework Apache Wicket Java Web Application Framework

What is Wicket? Web Application Framework Component-Component-based Framework Wicket 1.4 is Java 1.5+ compliant

Where does Wicket fit?

Request / Response JSP Request / Response

Model 2 (MVC) Struts, Spring MVC, Stripes

Advantages of R/R Rendering views is generally quite fast Development can leverage existing tag libraries Recruiting developers may be easier Modern implementations have good support for DI and IoC frameworks

Disadvantages of R/R Controller implementations must explicitly consider multiple concurrent users and threads Controllers generally work literally in terms ofHTTP requests and responses Controllers often explicitly manage state Not strictly Object Oriented The programming model is skewed

The Impedance Mismatch The Programming Model Programming in Java - do we regularly focus on how the JVM manages object instances and variables? Generally, website development requires an understanding of the HTTP protocol. IE: manually managing state within and across requests forces front end handlers to be protocol specific.

What if ... ? What if we considered a page ... a Page? What if we considered a button ... a Button? And upon clicking a button, handled an onClick event? What if web-development resembled Swing or event-driven development? What kind of framework could possibly enable this?!

Enter ... Wicket Component-based framework Instead of creating a controller, servlet or action class ... create a Page Place components on said Page and define how each component reacts to user input •Build the Page in Java to manage HTML page elements ... not the other way around

Web App Config web.xml

Wicket Config WicketApplication.java

General Structure Layout the element hierarchy Style the elements Markup (HTML’s Role) Code (Java’s Role) Properties Files

Hello World Markup Java

Result

Forms (HTML) Markup

Forms (Java) Java

Component Family

Advantages POJO-centric Avoid overuse of XML configuration files Fully solve back button problem Easy to create bookmarkable pages Reusability Easy to integrate with Java security Compatible with any ordinary HTML editor

Wicket Resources Wicket Links http://wicket.apache.org/ http://wicketstuff.org/ http://cwiki.apache.org/WICKET/ Wicket Books Wicket in Action (Manning) Pro Wicket (Apress)