THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Read some introductory material on how to define Geronimo in Eclipse at Geronimo Eclipse Plugin Usage Instructions
Create Enterprise Application Project
Start from creating an enterprise application project. Select File > New, select Project... (or alternatively press Ctrl-N) and in the popup window select select Enterprise Application Project in J2EE category.
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You should now have the following project structure.
Create EJB project
The next step is to create an EJB project to hold your EJBs. Press Ctrl-N and select EJB Project in EJB category.
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| Note |
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Remove META-INF/openejb-jar.xml file as it leads to deployment issues. |
Create Dynamic Web Project
The next step is to create a Dynamic Web project to hold your web application. Press Ctrl-N and select Dynamic Web Project in Web category.
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You should now have the following project structure.
Create Stateless Session EJB
Every stateless session ejb has its own business interface. There're three types of business interfaces - @Remote, @Local and @WebService - and their combinations. Suffice to say that every EJB development starts from defining a business interface and implementing it by a bean implementation class.
Create remote business interface
Right-click on the SampleEJB project and select New > Interface and fill it in with the following values:
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package sampleear;
import javax.ejb.Remote;
@Remote
public interface RemoteBusinessInterface {
public String sayHello(String name);
}
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Create bean class
Right-click on the SampleEJB project and select New > Class and fill it in with the following values:
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package sampleear;
import javax.ejb.Stateless;
@Stateless
public class MyStatelessSessionBean implements RemoteBusinessInterface {
public String sayHello(String name) {
return getClass().getName() + " says hello to " + name + ".";
}
}
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Web application development
The time has come to use the ejb in the web application. We create a jsp page index.jsp that executes a servlet MyServlet that in turn executes the ejb MyStatelessSessionBean.
Create welcome page - index.jsp
Right-click on the SampleWAR project and select New > JSP. Name it index.jsp. Press Finish.
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<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>5-minute introduction to enterprise application development with Eclipse and Geronimo</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/sayHello">
<input type="text" name="name" /><input type="submit" value="Press me!" />
</form>
</body>
</html>
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Create servlet - MyServlet
Since the servlet calls the EJB, the web project the servlet is in depends on the EJB project. Let's define the dependency.
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package sampleear;
import java.io.IOException;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
static final long serialVersionUID = 1L;
@EJB
RemoteBusinessInterface remoteBusinessIntf;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String name = request.getParameter("name");
if (name == null || name.length() == 0) {
name = "anonymous";
}
response.getWriter().write(remoteBusinessIntf.sayHello(name));
}
}
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Create application.xml
| Note |
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It appears that the file is not created by default and the application could not be deployed to any Java EE 5-compliant application server, Geronimo including. We need to define it manually. Don't know whether it's a bug in Eclipse or Geronimo Eclipse Plugin. |
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<?xml version="1.0" encoding="ASCII"?>
<application xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:application="http://java.sun.com/xml/ns/javaee/application_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/application_5.xsd"
version="5">
<display-name>SampleEAR</display-name>
<module>
<ejb>SampleEJB.jar</ejb>
</module>
<module>
<web>
<web-uri>SampleWAR.war</web-uri>
<context-root>/SampleWAR</context-root>
</web>
</module>
</application>
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Run it!
After a very hard 4-minute development it's time to give it a shot and see if it works. Not much time left so hurry up!
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