Welcome!

Eclipse Authors: Sematext Blog, Marcin Warpechowski, Trevor Parsons, Michael Meiner, Carmen Gonzalez

Related Topics: Eclipse

Eclipse: Article

Creating Web Applications with the Eclipse Web Tools Project

Using open source to develop Web applications, EJBs, and Web services

The Web Tools Project (WTP) by the Eclipse Foundation is a set of open source tools that substantially reduce the time required for the development of Web applications, EJBs, and Web services. The WTP's current version is 0.7.1 and version 1.0 is coming later this year. The framework provides wizards and tools to create EJBs, Web components such as servlets and JSPs, and Web services using the Axis engine. It also provides source editors for HTML, JavaScript, CSS, JSP, SQL, XML, DTD, XSD, and WSDL; graphical editors for XSD, WSDL, J2EE project builders, models, and a J2EE navigator; a Web service wizard, explorer, and WS-I Test Tools; and database access, query tools, and models.

In this article I'll show you how to develop and deploy a JSP Web application with WTP in less than an hour. I'll also cover the creation and deployment of a basic servlet and editing JSP with WTP. Let's develop the WTP application together but, first, we need to install the following software:

  1. J2SE 5.0 JRE: http://java.sun.com/j2se
  2. Eclipse 3.1: www.eclipse.org
  3. WTP 0.7.1: www.eclipse.org/webtools
  4. Tomcat 5.0: http://jakarta.apache.org/tomcat/
  5. MySQL 4.0.25: www.mysql.com
  6. MySQL Connector/J Driver 3.1: www.mysql.com/products/connector/j/

Application Overview
Our application will be a basic Web application implementing the following use cases:

  • Customers need to register on the site to place orders.
  • Customers can place orders.
  • Customers can view their orders.
  • Admin can list all registered customers.

The system will be implemented using a servlet programming model and MySQL database.

Configuring MySQL Database and the Data Source
By default, when MySQL gets installed, a TEST database is available. Be sure to launch C:\Mysql\winmysqladmin.exe to specify the user name and password (the first time you launch it, it lets you do it and also starts the database server). It's necessary to copy MySQL Connector/J JDBC Driver: mysql-connector-java-3.1.10-bin.jar to the Tomcat/common/lib directory, so the Tomcat server can recognize it.

To configure MySQL database access in Tomcat, we have to add a separate file called Listing 1: DBTest.xml; the file follows a convention of "application_name.xml" under $TOMCAT\conf\catalina\localhost directory. The only problem with this file is that it may get deleted when the application is undeployed, so if you undeploy and redeploy the application, you have to place this file into the same folder again (so it's a good idea to save it somewhere else). Looking inside the DBTest.xml file, please note that in our case we are using "ODBC" for the username and don't provide any password.

Building Our Web Application Using Web Tools and a Database
Before we can start working on the Web project, we must configure Tomcat 5.0 in Eclipse to be our default server. When Web Tools are installed in Eclipse, new perspectives and options are added, such as a J2EE perspective where you can create J2EE projects, Web projects, and Web services. New options are available under the Window-Preferences menu for configuring Tomcat servers with Eclipse. Go to Window - Preferences menu, under Server select - Installed Runtimes, click Add, and then specify Tomcat 5.0 server with the installed JRE and a path to the Tomcat installation directory (see Figure 1). Now create a Dynamic Web Project using the Web Tools wizard by selecting File-New-Other, then expanding Web-Dynamic Web Project.

We'll name the project DBTest, which will also become its context root. The Web module will be targeted to our default server: Tomcat. Click Finish and the DBTest Web project gets created. This project will contain all of our Web resources, such as HTML and JSP files, and servlets, and you'll be able to export it into a standard WAR file later, if needed.

Creating Supporting Domain Classes and Tables
Before creating servlets, let's create supporting classes to represent a customer and an order. The class diagram in Figure 2 depicts the Customer and Order relationship.

Note that when creating Customer and Order classes, we define corresponding fields as their public instance variables and then can automatically generate getters and setters from those fields. This can be easily done by going to Outline view (appears after you double-click on an existing class name or create a new class), selecting a class, and selecting "Source - Generate Getters and Setters..." from the right-button menu (see Figure 3).

Along with the classes, we'd have to create corresponding database tables in a MySQL database:


CREATE TABLE CUSTOMER (
ID INT PRIMARY KEY,
FIRST_NAME VARCHAR(50),
LAST_NAME VARCHAR(50),
ADDRESS VARCHAR(150));

CREATE TABLE ORDERS (
ID INT PRIMARY KEY,
CUST_ID INT REFERENCES CUSTOMER,
DATE_PLACED DATE,
AMOUNT INT);

Creating Database Command Classes
We'll create a special package with classes that implement a Command design pattern to perform necessary database updates. The Command pattern allows the classes to implement the common interface executing some particular command. Examples of the Command pattern in Java would be classes that implement the ActionListener interface with the actionPerformed() method. Our Command pattern interface for database integration is presented in Listing 2.

Classes implementing this command will be performing the actual database operations for reading and inserting rows into customer and order tables. The following use cases will be addressed:

  • Customers want to register on the site in order to place orders (a new row is created in the customer table)
  • Customers can place the order (the order gets created in the database for a particular customer)
  • Customers can view the orders they have placed
  • Admin can list all the customers

Based on these use cases, the following classes have implemented the DatabaseCommand interface (see Listings 3-6):

public class CreateCustomer implements DatabaseCommand
public class CreateOrder implements DatabaseCommand
public class ListCustomers implements DatabaseCommand
public class ListCustomerOrders implements DatabaseCommand

Finally, in order to execute our command classes, we will need to create a class that would access the database datasource, obtain a SQL connection, and then execute a particular database command. This class will implement a Singleton design pattern, which we'll call CommandExecutor:

Object o = CommandExecutor.getInstance().executeDatabaseCommand
(<<instance of the particular database command class goes here>>).

The CommandExecutor class will perform the datasource lookup as follows:

InitialContext ctx = new InitialContext();
Context envCtx = (Context) ctx.lookup("java:comp/env");
ds = (DataSource) envCtx.lookup("jdbc/TestDB");

This finds the reference to the data-source we have defined in DBTest.xml by resolving its reference in a Web deployment descriptor (web.xml), which we'll define in a section below. Listing 7 has the complete code of the Command Executor class.

More Stories By Boris Minkin

Boris Minkin is a Senior Technical Architect of a major financial corporation. He has more than 15 years of experience working in various areas of information technology and financial services. Boris is currently pursuing his Masters degree at Stevens Institute of Technology, New Jersey. His professional interests are in the Internet technology, service-oriented architecture, enterprise application architecture, multi-platform distributed applications, and relational database design. You can contact Boris at [email protected]

Comments (15) View Comments

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.


Most Recent Comments
Mintara 12/26/07 04:11:21 PM EST

Hello Sir,
Could you please elaborate (for e.g the classes ..I could not find the source code)what you have explained.
Thank you.

Serge Cambour 09/25/07 06:38:15 AM EDT

It would be really a very good article or a tutorial if the author had tested it himself before posting it. I don't even talk of missing details, classes, code mistakes, ets. that make you loose any wish to continue.

Keith Freeman 07/15/06 10:32:01 PM EDT

Well, this seems like a fantastic tutorial, until suddenly the "CreateCustomerServlet" description morphs into a "ListCustomersServlet". We're left to figure out how to finish the servlets ourselves (still in progress for me), since as others point out here a bunch of code is missing from the zip file download. VERY disappointing after such a strong start.

David Paules 05/24/06 04:04:22 PM EDT

Good introduction article. Unfortunately, it's not clear where the database connection file DBTest.xml should reside when running Tomcat under Eclipse. Where does this file or it's content go in the Dynamic Web project tree? Because of this, I get an error message at debug time:

javax.servlet.ServletException: Cannot create JDBC driver of class '' for connect URL 'null'

Chuck Ferrick 05/20/06 09:24:58 PM EDT

I was very interesting article, but most of the listings where not posted. I was hoping to gain some insight on how you configure Hibernate. Your article stated to look at listing 9, but listing 9 was know where to be found. I was also frustrated when I could not find the DBTest.war file on java.sys-con web site.

Good furture article and maybe next time JDJ will include all of the necesasry file listings.

Achille Komla 02/05/06 10:57:41 PM EST

Very well done. It will be good to see how the application works with hibernate.

Daniel Hillebrand 12/15/05 04:35:56 AM EST

Hi Boris,

thank you for your great tutorial! Maybe you could add a note to your article regarding running Tomcat in eclipse:

You have to put the content of DBTest.xml in the (new) file context.xml in "WebContent/META-INF". The path strings are not needed, except the "path" string.

regards, Daniel

Bill Gercken 12/09/05 09:02:38 AM EST

Soource code: For those who did not find it: the link to the source is at the top of listing 1. View link: http://res.sys-con.com/story/nov05/152270/source.html

km 12/07/05 03:41:46 PM EST

could you provide the link for the source code

Paul Mischler 12/05/05 04:39:16 PM EST

Did anyone notice that listings 3-10 aren't included in the dead-tree edition?

Corrections to the article:

For the code to work "out of the box", the Customer and Order classes need to be created in a package called "domain"

Figure 2 shows "cust_id" as a member of the Order class. However, the image of Figure 3 (and the CreateOrder class sample code) utilize "custId".

A helpful reminder that a user with permissions to access the database tables would have been helpful.

CS Cassell 12/02/05 10:01:30 AM EST

Several of the links are broken. This could be a really good article but ones needs the various links to work correctly.

José D´Andrade 12/01/05 09:11:56 AM EST

Please, think Linux. Think about Linux users when writing articles about developing whatever using:

Eclipse
Apache
Tomcat
MySQL

It is confusing to read about things that perhaps only apply to MS Windows (¨be sure to launch C:\Mysql\winmysqladmin.exe ¨) when the tools are mostly used by Linux people. And, this is not religion.

At least, write referencing both OSs.

José D´Andrade 12/01/05 09:10:40 AM EST

Please, think Linux. Think about Linux users when writing articles about developing whatever using:

Eclipse
Apache
Tomcat
MySQL

It is confusing to read about things that perhaps only apply to MS Windows (¨be sure to launch C:\Mysql\winmysqladmin.exe ¨) when the tools are mostly used by Linux people. And, this is not religion.

At least, write referencing both OSs.

Bill Dornbush 11/29/05 03:16:26 PM EST

Where is the source code for the article? I can't find any for this issue of the magazine at java.sys-con.com

@ThingsExpo Stories
Today’s enterprise is being driven by disruptive competitive and human capital requirements to provide enterprise application access through not only desktops, but also mobile devices. To retrofit existing programs across all these devices using traditional programming methods is very costly and time consuming – often prohibitively so. In his session at @ThingsExpo, Jesse Shiah, CEO, President, and Co-Founder of AgilePoint Inc., discussed how you can create applications that run on all mobile devices as well as laptops and desktops using a visual drag-and-drop application – and eForms-buildi...
The Industrial Internet revolution is now underway, enabled by connected machines and billions of devices that communicate and collaborate. The massive amounts of Big Data requiring real-time analysis is flooding legacy IT systems and giving way to cloud environments that can handle the unpredictable workloads. Yet many barriers remain until we can fully realize the opportunities and benefits from the convergence of machines and devices with Big Data and the cloud, including interoperability, data security and privacy.
IoT is still a vague buzzword for many people. In his session at @ThingsExpo, Mike Kavis, Vice President & Principal Cloud Architect at Cloud Technology Partners, discussed the business value of IoT that goes far beyond the general public's perception that IoT is all about wearables and home consumer services. He also discussed how IoT is perceived by investors and how venture capitalist access this space. Other topics discussed were barriers to success, what is new, what is old, and what the future may hold. Mike Kavis is Vice President & Principal Cloud Architect at Cloud Technology Pa...
SYS-CON Events announced today that CodeFutures, a leading supplier of database performance tools, has been named a “Sponsor” of SYS-CON's 16th International Cloud Expo®, which will take place on June 9–11, 2015, at the Javits Center in New York, NY. CodeFutures is an independent software vendor focused on providing tools that deliver database performance tools that increase productivity during database development and increase database performance and scalability during production.
Dale Kim is the Director of Industry Solutions at MapR. His background includes a variety of technical and management roles at information technology companies. While his experience includes work with relational databases, much of his career pertains to non-relational data in the areas of search, content management, and NoSQL, and includes senior roles in technical marketing, sales engineering, and support engineering. Dale holds an MBA from Santa Clara University, and a BA in Computer Science from the University of California, Berkeley.
The Internet of Things (IoT) is rapidly in the process of breaking from its heretofore relatively obscure enterprise applications (such as plant floor control and supply chain management) and going mainstream into the consumer space. More and more creative folks are interconnecting everyday products such as household items, mobile devices, appliances and cars, and unleashing new and imaginative scenarios. We are seeing a lot of excitement around applications in home automation, personal fitness, and in-car entertainment and this excitement will bleed into other areas. On the commercial side, m...
The Internet of Things (IoT) promises to evolve the way the world does business; however, understanding how to apply it to your company can be a mystery. Most people struggle with understanding the potential business uses or tend to get caught up in the technology, resulting in solutions that fail to meet even minimum business goals. In his session at @ThingsExpo, Jesse Shiah, CEO / President / Co-Founder of AgilePoint Inc., showed what is needed to leverage the IoT to transform your business. He discussed opportunities and challenges ahead for the IoT from a market and technical point of vie...
Things are being built upon cloud foundations to transform organizations. This CEO Power Panel at 15th Cloud Expo, moderated by Roger Strukhoff, Cloud Expo and @ThingsExpo conference chair, addressed the big issues involving these technologies and, more important, the results they will achieve. Rodney Rogers, chairman and CEO of Virtustream; Brendan O'Brien, co-founder of Aria Systems, Bart Copeland, president and CEO of ActiveState Software; Jim Cowie, chief scientist at Dyn; Dave Wagstaff, VP and chief architect at BSQUARE Corporation; Seth Proctor, CTO of NuoDB, Inc.; and Andris Gailitis, C...
The 3rd International Internet of @ThingsExpo, co-located with the 16th International Cloud Expo - to be held June 9-11, 2015, at the Javits Center in New York City, NY - announces that its Call for Papers is now open. The Internet of Things (IoT) is the biggest idea since the creation of the Worldwide Web more than 20 years ago.
"People are a lot more knowledgeable about APIs now. There are two types of people who work with APIs - IT people who want to use APIs for something internal and the product managers who want to do something outside APIs for people to connect to them," explained Roberto Medrano, Executive Vice President at SOA Software, in this SYS-CON.tv interview at Cloud Expo, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Performance is the intersection of power, agility, control, and choice. If you value performance, and more specifically consistent performance, you need to look beyond simple virtualized compute. Many factors need to be considered to create a truly performant environment. In his General Session at 15th Cloud Expo, Harold Hannon, Sr. Software Architect at SoftLayer, discussed how to take advantage of a multitude of compute options and platform features to make cloud the cornerstone of your online presence.
SYS-CON Media announced that Splunk, a provider of the leading software platform for real-time Operational Intelligence, has launched an ad campaign on Big Data Journal. Splunk software and cloud services enable organizations to search, monitor, analyze and visualize machine-generated big data coming from websites, applications, servers, networks, sensors and mobile devices. The ads focus on delivering ROI - how improved uptime delivered $6M in annual ROI, improving customer operations by mining large volumes of unstructured data, and how data tracking delivers uptime when it matters most.
In this Women in Technology Power Panel at 15th Cloud Expo, moderated by Anne Plese, Senior Consultant, Cloud Product Marketing at Verizon Enterprise, Esmeralda Swartz, CMO at MetraTech; Evelyn de Souza, Data Privacy and Compliance Strategy Leader at Cisco Systems; Seema Jethani, Director of Product Management at Basho Technologies; Victoria Livschitz, CEO of Qubell Inc.; Anne Hungate, Senior Director of Software Quality at DIRECTV, discussed what path they took to find their spot within the technology industry and how do they see opportunities for other women in their area of expertise.
DevOps Summit 2015 New York, co-located with the 16th International Cloud Expo - to be held June 9-11, 2015, at the Javits Center in New York City, NY - announces that it is now accepting Keynote Proposals. The widespread success of cloud computing is driving the DevOps revolution in enterprise IT. Now as never before, development teams must communicate and collaborate in a dynamic, 24/7/365 environment. There is no time to wait for long development cycles that produce software that is obsolete at launch. DevOps may be disruptive, but it is essential.
Almost everyone sees the potential of Internet of Things but how can businesses truly unlock that potential. The key will be in the ability to discover business insight in the midst of an ocean of Big Data generated from billions of embedded devices via Systems of Discover. Businesses will also need to ensure that they can sustain that insight by leveraging the cloud for global reach, scale and elasticity.
SYS-CON Media announced that Cisco, a worldwide leader in IT that helps companies seize the opportunities of tomorrow, has launched a new ad campaign in Cloud Computing Journal. The ad campaign, a webcast titled 'Is Your Data Center Ready for the Application Economy?', focuses on the latest data center networking technologies, including SDN or ACI, and how customers are using SDN and ACI in their organizations to achieve business agility. The Cisco webcast is available on-demand.
"BSQUARE is in the business of selling software solutions for smart connected devices. It's obvious that IoT has moved from being a technology to being a fundamental part of business, and in the last 18 months people have said let's figure out how to do it and let's put some focus on it, " explained Dave Wagstaff, VP & Chief Architect, at BSQUARE Corporation, in this SYS-CON.tv interview at @ThingsExpo, held Nov 4-6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
Building low-cost wearable devices can enhance the quality of our lives. In his session at Internet of @ThingsExpo, Sai Yamanoor, Embedded Software Engineer at Altschool, provided an example of putting together a small keychain within a $50 budget that educates the user about the air quality in their surroundings. He also provided examples such as building a wearable device that provides transit or recreational information. He then reviewed the resources available to build wearable devices at home including open source hardware, the raw materials required and the options available to power s...
“The age of the Internet of Things is upon us,” stated Thomas Svensson, senior vice-president and general manager EMEA, ThingWorx, “and working with forward-thinking companies, such as Elisa, enables us to deploy our leading technology so that customers can profit from complete, end-to-end solutions.” ThingWorx, a PTC® (Nasdaq: PTC) business and Internet of Things (IoT) platform provider, announced on Monday that Elisa, Finnish provider of mobile and fixed broadband subscriptions, will deploy ThingWorx® platform technology to enable a new Elisa IoT service in Finland and Estonia.
Advanced Persistent Threats (APTs) are increasing at an unprecedented rate. The threat landscape of today is drastically different than just a few years ago. Attacks are much more organized and sophisticated. They are harder to detect and even harder to anticipate. In the foreseeable future it's going to get a whole lot harder. Everything you know today will change. Keeping up with this changing landscape is already a daunting task. Your organization needs to use the latest tools, methods and expertise to guard against those threats. But will that be enough? In the foreseeable future attacks w...