Running JMS simple application from java standalone program stucks

Question

Hi All, i`m new to JMS service, and tried to code a simple application from the J2EE guide. They use standalone j2ee client application there, and i did not
dound any way to debug it from eclipse .. so i have coded following standalone app (not j2ee client JAR) to produce simple messages
public class producerMain {
     public static void main(String argv[]) throws NamingException, JMSException
          Properties jndiProp = new Properties();
          jndiProp.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY,"com.sun.enterprise.naming.SerialInitContextFactory");
          jndiProp.put(javax.naming.Context.PROVIDER_URL, "localhost:3920");
          InitialContext context =new InitialContext(jndiProp);
          ConnectionFactory factory = (ConnectionFactory)context.lookup("sashaConnectionFactory");
          Queue queue = (Queue)context.lookup("jms/Queue");
          System.out.println("Got here");
          Connection connection = factory.createConnection();
Session session = connection.createSession(
false,
Session.AUTO_ACKNOWLEDGE);
MessageProducer producer = session.createProducer(queue);
TextMessage message = session.createTextMessage();
for (int i = 0; i < 5; i++) {
message.setText("This is message " + (i + 1));
System.out.println("Sending message: " + message.getText());
producer.send(message);
producer.send(session.createMessage());
producer.close();
session.close();
connection.close();
factory = null;
     context.close();
     System.out.println("Quiting application");
application works .. it sends a messages .. but it does not quit .. (dozens of new threads get opened, besides the main thread, which quits, but other threads
does not quit .. and the application stucks .. )
Does anyone know, why does it stuck .. what are those threads ? and why does not they finish ?
Thanks, Regards Sasha.

Answer 1

Thanks.
changing to
exp.append("\n");and flushing the writer stream and closing the stream fixed the problem.
Why do we have to flush the stream?
and, why do we have to close the writer before reading? what if I want to continue writting in to the writer?
thanks again.