 |
|
 |
 |
|
|
 
Masoud Kalali's Blog
«Simply backup and restore your domains in GlassFish Using GlassFish Command Console |
Main
| GlassFish is Open source , but how much Open it is ? »
Step by Step toward a jms sample in NetBeans and yes GlassFishPosted by kalali on May 05, 2006 at 06:40 AM | Comments (4)Java EE 5 brings many ease of use in EJB development world and certainly it is one of biggest step ahead in java EE land. NetBeans 5.5 is another big step toward making development on top Java EE some easier. NetBeans is a very easy to learn and use because it does not bring many stuff on the screen to "Occupy all the space" instead it provide maximum useability by means of limited number of views. GlassFish as Reference implementation of JAVA EE 5 , provide you with all service that are named in java EE spec but it is not similar to older RI version of J2EE ,just remember J2EE 1.3 RI it is much more better in term of functionality, performance, ease of use and ... here I will tell you steps that you need to follow to build a simple MDB , a web based message producer and a remote message producer. when you follow this entry you will be able to deal with basic aspect of JMS in Action and not only on your papers. but what do we need to have our JMS application running ?
To create Queue and connection follow these steps :
go to project view , right click on EJB module and select NewMessage-Driven Bean... a window will open and ask you for some attributes of this MDB fill in the names like :
*** This is where our MDB is assigned to , whether it is a topic in publish/subscribe scenario or a queue in point-to-point scenario. Now change the implementation of your onMessage(...) as following , we also add one private object to our class , make sure that you include it too.
@Resource
private MessageDrivenContext mdc;
public void onMessage(Message message) {
TextMessage msg = null;
try {
if (message instanceof TextMessage) {
msg = (TextMessage) message;
System.out.println("A Message received in TMDB: " +
msg.getText());
} else {
System.out.println("Message of wrong type: " +
message.getClass().getName());
}
} catch (JMSException e) {
e.printStackTrace();
mdc.setRollbackOnly();
} catch (Throwable te) {
te.printStackTrace();
}
}
we just made one more change in class skeleton and that is our MessageDrivenContext variable , we usually use this to call setRollbackOnly(...) when we use an MDB in a transactional scenario for this sample you simpley can ignore it. Now lets make our web application to send some messages to that Queue and let the MDB fetch and process them. wxpand web application node , and double click on index.jsp after it opens , change its content like the following , sure you can use component platte to drag and drop items to jsp source file :-) <%@page contentType="text/html"%> <%@page pageEncoding="UTF-8"%> <!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=UTF-8"> <title>JSP Page</title> </head> <body> <center> <form action="sendMessage"> <table cellspacing="20" > <tbody> <tr> <td>Enter some message: </td> <td><input type="text" name="message" value="Enter your message here" width="30" /></td> </tr> </tbody> </table> <input type="submit" value="Send The message" name="send" /> </center> </form> </body> </html> Now we need to build a servlet , which will send messages to our Queue , for this task you need to do these steps :
protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); //start the jms stuff try{ Context ctx = new InitialContext(); ConnectionFactory connectionFactory = (ConnectionFactory)ctx.lookup("jms/tConnectionFactory"); Queue queue = (Queue)ctx.lookup("jms/tQueue"); javax.jms.Connection connection = connectionFactory.createConnection(); javax.jms.Session session = connection.createSession(false,Session.AUTO_ACKNOWLEDGE); MessageProducer messageProducer = session.createProducer(queue); TextMessage message = session.createTextMessage(); message.setText(request.getParameter("message")); System.out.println( "It come from Servlet:"+ message.getText()); messageProducer.send(message); //message sent , it was all //show what we have done in this servlet out.println("<html>"); out.println("<head>"); out.println("<title>Servlet sendMessage</title>"); out.println("</head>"); out.println("<body>"); out.println("<center>"); out.print("Servlet Send this message <h2>"+request.getParameter("message") + "</h2> to this Queue : <h2>"+queue.getQueueName()+"</h2>"); out.println("</center>"); out.println("</body>"); out.println("</html>"); } catch(Exception ex){ ex.printStackTrace(); } out.close(); } It was all you should do to create a JMS point to point sample. to view what you have Done , press F6 , if you did all the above as i said you will see a page like : 
Now just give it a message and press the button , what you will see should looks like the following image , in case that your praise the NetBeans and GlassFish as i did ;-) 
and if you look at Application server log file , you will see something similar to : (to view the application server log file go to runtime view , right click on glassfish node and select view log file) 
You can download the project from here but make sure that you build the connection factory and queue because project will need them . In next part i will show you how easily you can make a remote client to deal with your jms destinations. Bookmark blog post:  del.icio.us  Digg  DZone  Furl  Reddit
CommentsComments are listed in date ascending order (oldest first) | Post Comment
| |
 java.net RSS Feeds
|
