Javax.jms: Interface Connection

Question

Hi all.
In the above interface is said:
"A Connection object is a client's active connection to its JMS provider. It typically allocates provider resources outside the Java virtual machine (JVM). "
What does this part exactly mean?
"It typically allocates provider resources outside the Java virtual machine (JVM)."
Thanks in advance.

Answer 1

Can you also help me on this please; I have this piece of code; factory is an object of type: progress.message.jclient.ConnectionFactory
Then createConnection() returns an object of type: Connection: javax.jms Interface Connection
But shouldn't Connection be a class and not an interface?
Any help is greatly appreciated.
public class Chat
    implements javax.jms.MessageListener
private javax.jms.Connection connect = null;
    private javax.jms.Session pubSession = null;
    private javax.jms.Session subSession = null;
    private javax.jms.MessageProducer publisher = null;
    /** Create JMS client for publishing and subscribing to messages. */
    private void chatter( String broker, String username, String password)
        // Create a connection.
        try
// factory is an object of type: progress.message.jclient.ConnectionFactory
javax.jms.ConnectionFactory factory;
            factory = (new progress.message.jclient.ConnectionFactory (broker));
            connect = factory.createConnection (username, password);
            pubSession = connect.createSession(false,javax.jms.Session.AUTO_ACKNOWLEDGE);
            subSession = connect.createSession(false,javax.jms.Session.AUTO_ACKNOWLEDGE);
        catch (javax.jms.JMSException jmse)
            System.err.println("error: Cannot connect to Broker - " + broker);
            jmse.printStackTrace();
            System.exit(1);
}