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JMS Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM J2EE INTERVIEW QUESTIONS JMS INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

JMS Interview Questions & Answers - Learning Mode

Java Message Service (JMS) is an application program interface (API) from Sun Microsystems that supports the formal communication known as messaging between computers in a network. Sun's JMS provides a common interface to standard messaging protocols and also to special messaging services in support of Java programs. JMS (Java Message Service) is an API that provides the facility to create, send and read messages. It provides loosely coupled, reliable and asynchronous communication. JMS is also known as a messaging service.

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JMS Interview Questions & Answers - Learning Mode
Try JMS Interview Questions & Answers - Exam Mode
Question: What is the difference between queue and topic

Answer: A point-to-point (PTP) product or application is built around the concept of message queues, senders, and receivers. Each message is addressed to a specific queue, and receiving clients extract messages from the queue(s) established to hold their messages. Queues retain all messages sent to them until the messages are consumed or until the messages expire.

In a publish/subscribe (pub/sub) product or application, clients address messages to a topic. Publishers and subscribers are generally Source: CoolInterview.com
Question: What is the Role of the JMS Provider?

Answer: JMS is the ideal high-performance messaging platform for intrabusiness messaging, with full programmatic control over quality of service and delivery options.
JavaMail provides lowest common denominator, slow, but human-readable messaging using infrastructure already available on virtually every computing platform. Source: CoolInterview.com
Question: What is publish/subscribe messaging?

Answer: With publish/subscribe message passing the sending application/client establishes a named topic in the JMS broker/server and publishes messages to this queue. The receiving clients register (specifically, subscribe) via the broker to messages by topic; every subscriber to a topic receives each message published to that topic. There is a one-to-many relationship between the publishing client and the subscribing clients. Source: CoolInterview.com
Question: what is the use of JMS?In which situations we are using JMS?Can we send message from one server to another

Answer: You can use it in the context of mutithreading but it means JMS is not meant for Multithreading. Its basically meant for object communication.

It will be useful when you are writing some event based applications like Chat Server which needs a publish kind of event mechanism to send messages between the server to the clients who got connected with the server.

Moreover JMS gives Loosely-coupled kind of mechanism when compared with RMI which is tightly-coupled. In JMS there is no nee Source: CoolInterview.com
Question: Explain about Connection factory interface?

Answer: This has settings which creates a connection between the client and JMS provider. These settings are accessed through portable interface and need not be changed every time. These settings are configured in JNDI namespace. Source: CoolInterview.com
Question: What is JMS administered object ?


Answer: A preconfigured JMS object (a resource manager connection factory or a destination) created by an administrator for the use of JMS clients and placed in a JNDI namespace. Source: CoolInterview.com
Question: Where can I find a JMS API discussion group?

Answer: You can find a JMS API discussion forum at http://java.sun.com/j2ee/community/forums/index.html. You must be a member of the Java Developer Connection to join this forum. Source: CoolInterview.com
Question: What is the recoverability of messages for closed consumers?

Answer: ..A: For messages consumed from a queue or durable subscription, a rollback ensures that the messages are not acknowledged and that they will be delivered to the next consumer of these persistent entities. The JMS specification states that messages delivered to non-durable subscribers may be dropped. This statement means that the JMS API does not define the recoverability of messages consumed from a non-durable subscriber. Source: CoolInterview.com
Question:
How to create a durable subsriber ?



Answer: Having performed the normal setup, an application can create a durable subscriber to a destination. To do this, the client program creates a durable TopicSubscriber, using session.createDurableSubscriber. The name subName is used as an identifier of the durable subscription.
session.createDurableSubscriber( Topic topic, java.lang.String subName, java.lang.String messageSelector, boolean noLocal);
Alternatively, you can use the two-argument form of this operation, wh Source: CoolInterview.com
Question: What is the difference between durable and non-durable subscriptions?

Answer: Point-To-Point (PTP). This model allows exchanging messages via queues created for some purposes. A client can send and receive messages from one or several queues. PTP model is easier than pub/sub model.
A durable subscription gives a subscriber the freedom of receiving all messages from a topic, whereas a non-durable subscription doesn't make any guarantees about messages sent by others when a client was disconnected from a topic. Source: CoolInterview.com
Question: What Is the JMS API?

Answer: The Java Message Service is a Java API that allows applications to create, send, receive, and read messages. Designed by Sun and several partner companies, the JMS API defines a common set of interfaces and associated semantics that allow programs written in the Java programming language to communicate with other messaging implementations.
The JMS API minimizes the set of concepts a programmer must learn to use messaging products but provides enough features to support sophisticated messaging Source: CoolInterview.com
Question: What is the Java Message Service?

Answer: A: The Java Message Service (JMS) API is an API for accessing enterprise messaging systems. It is part of the Java 2 Platform, Enterprise Edition (J2EE). Source: CoolInterview.com
Question: What encryption options are there for sending messages through JMS?

Answer: Encryption is not handled by the JMS specification. It is left to the JMS provider to implement and provide encryption and decryption of messages. These days, Progress Software?s SonicMQ is a leading JMS provider and they have a robust encryption mechanism called Quality of Protection. They also provide an SSL-related feature, which also has build in encryption. Source: CoolInterview.com
Question: Explain about session interface?

Answer: Session interface is an important concept which deals partly with the queue system. It is a single thread session where messages are sent in an order. It holds the messages if transaction phase is selected and it also has facility for roll back. Source: CoolInterview.com
Question: Is the Java Message Service another mail API?

Answer: A: No. The term messaging is broadly defined in computing. It is used for describing various operating system concepts; it is used to describe email and fax systems; and with the JMS API, it is used to describe asynchronous communication between enterprise applications.<br><br>JMS messages are asynchronous requests, reports, or events that are consumed by enterprise applications, not humans. They contain vital information needed to coordinate these systems. They contain precisely for Source: CoolInterview.com
Question: Explain about point to point?

Answer: At the first point a producer posts a message to the receiver where it stays in a particular queue until the receiver opens the message from the queue. In this model predefining of the user is very important and in this form of model only one user will receive the message. During the process of the message it is not imperative for the user and sender to be online. Message opened is acknowledged. Source: CoolInterview.com
Question: What are the types of messaging?

Answer: There are two kinds of Messaging. Synchronous messaging involves a client that waits for the server to respond to a message. Asynchronous messaging involves a client that does not wait for a message from the server. An event is used to trigger a message from a server. Source: CoolInterview.com
Question: What is object message ?

Answer: Object message contains a group of serializeable java object. So it allows exchange of Java objects between applications. sot both the applications must be Java applications. Source: CoolInterview.com
Question: Why should developers use the Java Message Service?

Answer: The Java Message Service makes it easy to do the following:<br><br> * Write portable, message-based business applications<br> * Extend existing message-based applications by adding new JMS clients that interoperate fully with their existing non-JMS clients Source: CoolInterview.com
Question: What JDK release does the JMS API need?

Answer: The JMS API requires JDK/JRE release 1.1.x or higher. Source: CoolInterview.com

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