Apache Wicket

 ( Official Website ) 

Apache Wicket, commonly referred to as Wicket, is a component-based web application framework for the Java programming language conceptually similar to JavaServer Faces and Apache Tapestry. It was originally written by Jonathan Locke in April 2004. Version 1.0 was released in June 2005. It graduated into an Apache top-level project in June 2007.

In contrast, Wicket is closely patterned after stateful GUI frameworks such as Swing. Wicket applications are trees of components, which use listener delegates to react to HTTP requests against links and forms in the same way that Swing components react to mouse and keystroke events. Wicket is categorized as a component-based framework.

Each component is backed by its own model, which represents the state of the component. The framework does not have knowledge of how components interact with their models, which are treated as black box objects automatically serialization and persisted between requests. More complex models, however, may be made detachable and provide software hook to arrange their own storage and restoration at the beginning and end of each request cycle. Wicket does not mandate any particular object-persistence or ORM layer, so applications often use some combination of Hibernate objects, or as models.

In Wicket, all server side state is automatically managed. You should never directly use an HttpSession object or similar wrapper to store state. Instead, state is associated with components. Each server-side page component holds a nested hierarchy of stateful components, where each component's model is, in the end, a POJO (Plain Old Java Object)

Wicket aims for simplicity. There are no configuration files to learn in Wicket. Wicket is a simple class library with a consistent approach to component structure.

HelloWorld.html

The XHTML template.

   Message goes here
     

HelloWorld.java

The page component that will be bound to the template. It, in turn, binds a child component (the Label component named "message").

   /**
    * Constructor
    */
   public HelloWorld() {
       add(new Label("message", "Hello World!"));
   }
     

HelloWorldApplication.java

The main application class, which routes requests for the homepage to the HelloWorld page component.

   /**
    * Constructor.
    */
   public HelloWorldApplication() {
   }
     

   /**
    * @see org.apache.wicket.Application#getHomePage()
    */
   public Class getHomePage() {
       return HelloWorld.class;
   }
     

web.xml

The Java servlet application Deployment Descriptor, which installs Wicket as the default handler for the servlet and arranges for HelloWorldApplication to be instantiated at startup.

• Vaadin
• Apache Tapestry
• Apache Click
• ZK
• Richfaces
• Echo

• (2013). 9781783280018, Packt Publishing. . ISBN 9781783280018
• Jochen Mader (2012). 9783868020816, Entwickler. . ISBN 9783868020816
• (2011). 9781849511605, Packt Publishing. . ISBN 9781849511605
• (2008). 9781932394986, Manning Publications. ISBN 9781932394986
• Karthik Gurumurthy (2006). 9781590597224, Apress. . ISBN 9781590597224