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JBoss Meets Eclipse: Introducing the JBoss-IDE : Page 3

The wildly popular J2EE application server goes from full steam to mainstream with a GUI-based IDE that plugs into the Eclipse development framework.




Building the Right Environment to Support AI, Machine Learning and Deep Learning

Figure 3: Your source and output configuration should look like this.

Creating a Servlet
Now to learn how to use the plugin, you'll create a simple "Hello World!" Servlet and deploy it to JBoss.

Put your source code (.java files) in a source folder and your compiled classes (.class files) in an output folder. Follow these steps to configure your source and output folders (Figure 3).

  1. Right-click on your project in the Package Explorer.
  2. Go to Properties—>Java Build Path.
  3. Click on the Source tab.
  4. Click on Add Folder.
  5. Click on Create New Folder.
  6. Set the folder name to "src".
  7. Select Yes when it asks you to remove the project as a source folder and to create a "bin" folder.

Next, you need to set your CLASSPATHby defining the libraries (JAR files) that Eclipse should use to compile your code. You also need to add a JAR file that will allow you to compile a Servlet. Luckily, Eclipse comes equipped with a Tomcat plugin, which contains the library you will need you to compile a servlet.

Figure 4: This is how your libraries (CLASSPATH) should appear after adding the servlet.jar.

Follow these steps (see Figure 4):

  1. Click on the Libraries Tab (while still under Properties—>Java Build Path).
  2. Click Add Variable.
  3. Select ECLIPSE_HOME and click Extend.
  4. Navigate to the plugins/org.eclipse.tomcat.4.1.x directory.
  5. Select servlet.jar and click OK.
  6. Click OK to exit the properties dialog.

Now, create a class called HelloWorldSerlvet in the com.devx.examplepackage, using the following code in your servlet:

package com.devx.example; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class HelloWorldServlet extends HttpServlet { protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ServletOutputStream out = response.getOutputStream(); out.println("<html><body><h1>Hello World!</h1></body></html>"); } }

Figure 5: This is how the project structure looks after creating all the necessary files.

Next, you need a deployment descriptor so that JBoss will know how to access your Servlet. The deployment descriptor (web.xml) goes under a folder called WEB-INF in the .war file. Create a folder under src called WEB-INF. Then, create a file called web.xmlin that folder, using the following source.

<!DOCTYPE web-app PUBLIC '-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN' 'http://java.sun.com/j2ee/dtds/web-app_2.2.dtd'> <web-app> <servlet> <servlet-name>HelloWorldServlet</servlet-name> <servlet-class>com.devx.example.HelloWorldServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>HelloWorldServlet</servlet-name> <url-pattern>/Hello</url-pattern> </servlet-mapping> </web-app>

After all is said and done, your project structure should look like Figure 5.

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