250+ TOP MCQs on JMS Messages and Transactions and Answers

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MapMessage;
import javax.jms.MessageProducer;
import javax.jms.Session;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQQueue;
public class FrontDeskImpl implements FrontDesk {
	public void sendMail(Mail mail) {
		ConnectionFactory cf =
		new ActiveMQConnectionFactory("tcp://localhost:61616");
		Destination destination = new ActiveMQQueue("mail.queue");
		Connection conn = null;
		try {
			conn = cf.createConnection();
			Session session =
			conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
			MessageProducer producer = session.createProducer(destination);
			MapMessage message = session.createMapMessage();
			message.setString("mailId", mail.getMailId());
			message.setString("country", mail.getCountry());
			message.setDouble("weight", mail.getWeight());
			producer.send(message);
			session.close();
			} catch (JMSException e) {
				throw new RuntimeException(e);
			} finally {
				if (conn != null) {
				try {
				conn.close();
				} catch (JMSException e) {
				}
			}
		}
	}
}

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.MapMessage;
import javax.jms.MessageProducer;
import javax.jms.Session;
import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQQueue;
public class FrontDeskImpl implements FrontDesk {
	public void sendMail(Mail mail) {
		ConnectionFactory cf =
		new ActiveMQConnectionFactory("tcp://localhost:61616");
		Destination destination = new ActiveMQQueue("mail.queue");
		Connection conn = null;
		try {
			conn = cf.createConnection();
			Session session =
			conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
			MessageProducer producer = session.createProducer(destination);
			MapMessage message = session.createMapMessage();
			message.setString("mailId", mail.getMailId());
			message.setString("country", mail.getCountry());
			message.setDouble("weight", mail.getWeight());
			producer.send(message);
			session.close();
			} catch (JMSException e) {
				throw new RuntimeException(e);
			} finally {
				if (conn != null) {
				try {
				conn.close();
				} catch (JMSException e) {
				}
			}
		}
	}
}

Answer: a
Clarification: To send a JMS message with this template, you simply call the send() method and provide a message destination, as well as a MessageCreator object, which creates the JMS message you are going to send.

9. The MessageCreator interface declares method:-
a) createMessage()
b) create()
c) createMsg()
d) none of the mentioned
Answer: a
Clarification: The MessageCreator interface declares only a createMessage() method for you to implement.

10. A JMS template helps you to obtain and release the JMS connection and session.
a) True
b) False
Answer: a
Clarification: A JMS template helps you to obtain and release the JMS connection and session, and it sends the JMS message created by your MessageCreator object.

11. JMS sender and receiver classes can also extend to retrieve a JMS template:-
a) JmsGatewaySupport
b) JmsGateway
c) All of the mentioned
d) None of the mentioned
Answer: a
Clarification: Just like your DAO class can extend JdbcDaoSupport to retrieve a JDBCtemplate, your JMS sender and receiver classes can also extend JmsGatewaySupport to retrieve a JMS template.

12. When you need access to the JMS template.
a) setJmsTemplate
b) getJmsTemplate
c) getJms
d) none of the mentioned
Answer: b
Clarification: When you need access to the JMS template, you just make a call to getJmsTemplate().

13. Spring provides an implementation of SimpleMessageConvertor to handle the translation of a JMS message received.
a) True
b) False
Answer: a
Clarification: Spring provides an implementation of SimpleMessageConvertor to handle the translation of a JMS message received to a business object and the translation of a business object to a JMS message.

14. By default, the JMS template uses SimpleMessageConverter for converting TextMessage to or from a string.
a) True
b) False
Answer: a
Clarification: By default, the JMS template uses SimpleMessageConverter for converting TextMessage to or from a string, BytesMessage to or from a byte array, MapMessage to or from a map, and ObjectMessage to or from a serializable object.

15. For your front desk and back office classes, you can send and receive a map using the:-
a) convertAndSend()
b) receiveAndConvert()
c) all of the mentioned
d) none of the mentioned
Answer: c
Clarification: For your front desk and back office classes, you can send and receive a map using the convertAndSend() and receiveAndConvert() methods, and the map will be converted to/from MapMessage.