Sending a JMS message from a Servlet

Question

Hello All
I�m using the Sun Java Sysytem Application Server and have been trying to implement a servlet which on receipt of a Post message, takes the message and sends it using JMS to a message queue. I�m developing my first web application so all is fairly new to me but I desparately need to know if this scenario is viable. I have worked through relevant sections of the Java EE5 tutorial and so have the required ConnectionFactory and Queue resouces in place. I located the code below which the author implemented in Eclipse 3.2 and have tried to run it to establish that messages can be successfully sent. The code compiles ok but after the post message has been sent the server appears to lock up.
The servlet is as follows:
import java.io.IOException;
import javax.annotation.Resource;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class NewServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
@Resource(mappedName = "jms/Queue")
private Queue queue;
@Resource(mappedName = "jms/connectionFactory")
private ConnectionFactory jmsConnectionFactory;
//private Connection connection;
public NewServlet() {
super();
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Connection connection = null;
Destination dest = (Destination) queue;
try {
connection = jmsConnectionFactory.createConnection();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(dest);
TextMessage message = session.createTextMessage();
message.setText("Hello");
response.getOutputStream().println("Sending message: " + message.getText());
System.out.println("Sending message: " + message.getText());
producer.send(message);
producer.send(session.createMessage());
} catch (JMSException e) {
e.printStackTrace();
} finally {
if (connection != null) {
try {
connection.close();
} catch (JMSException e) {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
Please could someone point me in the right direction.
Many Thanks

Answer 1

Hello All
I�m using the Sun Java Sysytem Application Server and have been trying to implement a servlet which on receipt of a Post message, takes the message and sends it using JMS to a message queue. I�m developing my first web application so all is fairly new to me but I desparately need to know if this scenario is viable. I have worked through relevant sections of the Java EE5 tutorial and so have the required ConnectionFactory and Queue resouces in place. I located the code below which the author implemented in Eclipse 3.2 and have tried to run it to establish that messages can be successfully sent. The code compiles ok but after the post message has been sent the server appears to lock up.
The servlet is as follows:
import java.io.IOException;
import javax.annotation.Resource;
import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MessageProducer;
import javax.jms.Queue;
import javax.jms.Session;
import javax.jms.TextMessage;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class NewServlet extends javax.servlet.http.HttpServlet implements javax.servlet.Servlet {
@Resource(mappedName = "jms/Queue")
private Queue queue;
@Resource(mappedName = "jms/connectionFactory")
private ConnectionFactory jmsConnectionFactory;
//private Connection connection;
public NewServlet() {
super();
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Connection connection = null;
Destination dest = (Destination) queue;
try {
connection = jmsConnectionFactory.createConnection();
Session session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(dest);
TextMessage message = session.createTextMessage();
message.setText("Hello");
response.getOutputStream().println("Sending message: " + message.getText());
System.out.println("Sending message: " + message.getText());
producer.send(message);
producer.send(session.createMessage());
} catch (JMSException e) {
e.printStackTrace();
} finally {
if (connection != null) {
try {
connection.close();
} catch (JMSException e) {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}Please could someone point me in the right direction.
Many Thanks