Bill Digman is a Java EE / Servlet enthusiast and Open Source enthusiast who loves working with Caucho's Resin Servlet Container, a Java EE Web Profile Servlet Container. Bill has posted 12 posts at DZone. You can read more from them at their website. View Full User Profile

Tutorial covering JSP 2.2 and Servlets 3.0 with OpenSource Resin Servlet Container: Part 1

10.25.2012
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One interesting thing to note is the use of this new Java EE annotation @ApplicationScoped as follows:

import javax.enterprise.context.ApplicationScoped;

@ApplicationScoped
public class BookRepositoryImpl implements BookRepository {



Annotations allow you to add meta-data to Java objects. (To learn more about annotations see this annotations tutorial.).

The ApplicationScoped specifies that a bean is application scoped. Scoping defines a lifecycle for how long an object will be around. ApplicationScoped means it will be around for the complete lifecycle of the Web Application. This annotations has slightly different meanings depending on whether it is used with EJBs or Servlets. This annotation is part of the CDI support added to Java EE 6 to handle Java Dependency Injection. To learn more about CDI go see this tutorial Java Dependency Injection and this one part 2 both written by the same author that is writing this tutorial now. :)

Now that we have a model (Book, BookRepository), lets define our web controller (Servlet) and view (JSPs).

 

Servlets / JSP

Servlet Background

A servlet is a class that handles HTTP requests. A Java web application consists of one or more servlet bundled together with any JSPs and Java classes it needs into a war file (Web Application Archive file).

A nice related tutorial that describes Servlets in more detail is here: Hello World Servlet Tutorial.

Servlets run inside of a container like Caucho's Resin Servlet/JSP Container. End users typically use a Java Web Application through a web browser like Apple Safari, Google Chrome, Mozilla FireFox or heaven forbid Internet Explorer.

Next we will create our first Servlet.

 

Bill Digman is a Java EE / Servlet enthusiast and Open Source enthusiast who loves working with Caucho's Resin Servlet Container, a Java EE Web Profile Servlet Container.

 

Caucho's Resin OpenSource Servlet Container

 

Java EE Web Profile Servlet Container

 

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Published at DZone with permission of its author, Bill Digman.

(Note: Opinions expressed in this article and its replies are the opinions of their respective authors and not those of DZone, Inc.)

Comments

Bruce Phillips replied on Thu, 2012/10/25 - 11:00am

This is a good article but it could be made much,  much better by providing two items

 

1.  Code download

2.  PDF version that a reader can save to read later or to refer to when needed.  It is very tedious to click through 15 web pages where on each  page the ads and other crap overwhelm the important content.

 

 

Bill Digman replied on Thu, 2012/10/25 - 3:12pm in response to: Bruce Phillips

I'll work on a PDF version right away.

How do you suggest I provide code download?  

Bill Digman replied on Thu, 2012/10/25 - 4:29pm in response to: Bill Digman

The PDF version is attached

Bruce Phillips replied on Thu, 2012/10/25 - 7:02pm in response to: Bill Digman

Thank you very much for the PDF version. 

For the code you could use Eclipse - Export as archived projected which creates a zip of your project.  Other Eclipse users can then import the project directly from the zip.  Non-Eclipse users can unzip the project and view the files also.

 

Henk De Boer replied on Fri, 2012/10/26 - 12:11pm

It's thorough and explains things well, but it's a somewhat confusing setup.

The material being explained; Servlets, JSP and then Scriptlets vs JSTL feels like it comes straight from the early 2000s, but then we do see relative modern annotations on the Servlets and even the use of CDI.

Bill Digman replied on Thu, 2012/11/01 - 11:38am in response to: Henk De Boer

Yep... This is true. In a future article we are going to cover a more CDI centric approach covering @Produces @RequestScoped. Later we will cover JPA, JAX-RS, JCache, etc. and yes maybe even JSF (grumble, grumble)....

Bill Digman replied on Thu, 2012/11/01 - 11:39am

Stay tuned. I have a lot more to say. I think Java EE is more of a cafeteria plan than a one size fits all. You can use Servlets, CDI and JSP for model 2 apps. JAX-RS for RIA clients. Websockets, JCache, etc. Most tutorials wrt Java EE seem to really push JSF and EJB. If you tie Java EE to JSF and EJB and I think it turns a lot of folks off. Java EE is more than this.

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Keenee Madison replied on Thu, 2013/10/31 - 6:33am

JSP technology enables rapid development of web-based applications that are server- and platform-independent.  

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