ActiveMQ Producer

package com.simpleapplication.Profiler;

import javax.jms.*;

import org.apache.activemq.ActiveMQConnection;
import org.apache.activemq.ActiveMQConnectionFactory;

public class ActiveMQProducer {
    // = localhost
    private static String url = ActiveMQConnection.DEFAULT_BROKER_URL;
    // Name of the queue
    private static String subject = "Profiler";

    // Singleton
    private static final ActiveMQProducer instance = new ActiveMQProducer();
    private static ConnectionFactory connectionFactory;
    private static Connection connection;
    private static Session session;
    private static Destination destination;
    private static MessageProducer producer;

    private ActiveMQProducer() {
        connectionFactory = new ActiveMQConnectionFactory(url);
    }

    public void configure() {
        try {
            connection = connectionFactory.createConnection();
            connection.start();
            session = connection.createSession(false, Session.AUTO_ACKNOWLEDGE);
            destination = session.createQueue(subject);
        } catch (JMSException e) {
            e.printStackTrace();
        }
    }

    public static ActiveMQProducer getInstance() {
        return instance;
    }


    public void addToQueue(String stacktrace) {
        try {
            producer = session.createProducer(destination);
            TextMessage message = session.createTextMessage(stacktrace);
            producer.send(message);
        } catch (JMSException e) {
            e.printStackTrace();
        }
    }

    public void close() {
        try {
            connection.close();
        } catch (JMSException e) {
            e.printStackTrace();
        }
    }

}