Create stand-alone Web services applications with Eclipse ...

[Pages:27]Create stand-alone Web services applications with Eclipse and Java SE 6, Part 1: The Web service server application

Skill Level: Intermediate

Fiona Lam (fionalam@au1.) Software Engineer IBM

John Robertson (jtrobert@au1.) Staff Software Engineer IBM

13 Nov 2008

Use the Eclipse Integrated Development Environment (IDE) and JavaTM Platform, Standard Edition (Java SE) 6 to create a stand-alone Web services application that can be run from the console. In this tutorial, the first in a series, start by getting familiar with the Eclipse IDE. Configure the environment; create projects, packages, and classes; then run the application from the command line.

Section 1. Before you start

About this series

This tutorial series demonstrates how to create a stand-alone Web services server and client application that you can easily run from the command line with Java SE 6 rather than from within Web application server containers. Using a simple Hello World example, you'll leverage the Eclipse IDE, Java SE 6, and Apache Ant to easily create fully functioning Web services server and client applications. You'll also use the TCP/IP Monitor to examine the communication traffic between the server and client, and use the Eclipse Web Services Explorer tool to test the Web service.

The Web service server application ? Copyright IBM Corporation 2008. All rights reserved.

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About this tutorial

This tutorial, Part 1 of the series, introduces you to publishing a Web service application using the Eclipse IDE, Java SE 6, and Ant. It lays the groundwork for Part 2, which describes the creation of the Web services client application.

Objectives

After completing this tutorial you should know:

? What a Web service is and the standards it uses in relation to a browser being used from within Eclipse to view the published Web Services Description Language (WSDL) file.

? How to create the server side of a Web service, including how to install and configure the Eclipse IDE and the Java Development Kit (JDK) so that they perform together to generate the code that's compiled using Java SE 6.

? How to use the Ant Java-based build tool within the Eclipse IDE to run a special Java command to generate some of the code.

Prerequisites

This tutorial includes simple steps written for beginning- to intermediate-level Java programmers with some working knowledge of the Java language and Ant builds. Novice to more advanced Java developers will gain some knowledge of how to build, deploy, and run stand-alone Web services servers and distributed clients to provide firewall-friendly remote communications and applications processing.

System requirements

To follow the examples, you need to download:

? Eclipse IDE for Java Developers ? Java SE 6 You don't have to download Ant, as its functionality is bundled with Eclipse. This tutorial uses the Ganymede Package for the Eclipse IDE for Java EE Developers.

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Section 2. Set up your development environment

Install Java SE 6

1. Download and install the latest Java SE 6 JDK. Java SE 6 has many new features, including Web services APIs.

2. Double-click the executable file and follow the installation instructions. We recommend you perform the typical installation and maintain all default settings, such as location.

3. When asked, select whether you want to install the Java runtime environment as the system JVM and whether you want any browsers to be associated with the Java plug-in.

4. Click Finish to install.

5. Close any browser windows that are open.

6. When complete, you should be presented with a thank-you message confirming successful installation. Click OK to close.

Note: Installing the Java Runtime Environment (JRE) as the system Java Virtual Machine (JVM) means that it replaces any JVM found in the Microsoft? Windows? directory or places a new copy in there if one is not found. Associating any browsers with the Java plug-in means that this new version of Java will be used for applets.

Install Eclipse

Eclipse is an open source, extensible development platform, which can be installed on almost all operating systems. (Learn more about Eclipse.)

Installing Eclipse is fairly straightforward because there's no installation process:

? Download the Eclipse IDE for Java EE Developers. ? Extract the file to the desired location on your computer. You should then

see a folder named eclipse. It's a good idea to create a shortcut to the eclipse.exe file on your desktop for convenience.

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Configure Eclipse

When you first run Eclipse, the Welcome page is displayed, as shown in Figure 1. If you don't want to read the Overview and other offerings, simply close that page and come back to it later by selecting Help > Welcome.

Figure 1. Welcome screen

Configure Eclipse to use the Java SE 6 JDK you installed earlier; you want to associate your project with this version of Java:

1. Select Window > Preferences > Java > Installed JREs, and click the Add button.

2. Enter a name, such as Java SE 6, to easily identify what version it is.

3. Click the Browse button and locate the directory where JRE 60 was installed.

4. Click OK (see Figure 2). Figure 2. Adding a new JRE

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The new JRE should now appear in the list of installed JREs, as shown in Figure 3.

5. Select the Java SE 6 check box, then click OK. Figure 3. Selecting the new JRE

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6. To set compliance to the installed version of Java, select Window > Preferences > Java > Compiler.

7. Select 1.6 from the Compiler compliance level drop-down list, as shown in Figure 4. Figure 4. Setting compliance

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Create a project

Next you create a project to construct your Web services server. A project contains the source code and other related files, and it lets you use the project as the source container or to set up folders inside the project to organize files.

1. Select File > New > Project.

2. Expand the Java folder and click Java Project (see Figure 5). Figure 5. Creating a project in Eclipse

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3. Click Next.

4. Enter a project name, such as wsServerExample, when prompted, as shown in Figure 6. Figure 6. Entering project details in Eclipse

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