JMS Interview Questions

When the network connection between the client and server is lost then JMS provider must try to re-establish the connection. If the JMS provider cannot reconnect, the provider must notify the client....

Yes. You can write a snooper files to detect the service and restart the node upon node fail and a server instance fail.

When we have to use Queue and Topic?

- If there are more than one listener server requesting for the same request in a runnable application, then we have to go for Topic

- If there is only one listener vendor for the Object, then we need to choose Queue.

Need to configure for different appServers. Normally all the appserver has console but you need to configure for Jboss in a xml file. I think it is some JBoss-Jms.xml(not sure) but similar file like this.

A message consists of two parts: 1. Data that is sent from one program to another 2. The message descriptor or message header The message descriptor identifies the message (m...

A JMS message consists of three parts:Message header For message identification. For example, the header is used to determine if a given message is appropriate for a "subscriber" Properties For applic...

Nothing will happen to durable subscriber,hence publisher can add n number of messages,the fact is as soon as message is deployed in application server,the registered subscriber only  able to listen the message,or else he will be continuing with the previous message.

Can someone elobarate on this!

Centralized MOM means centralized messaging. JMS uses centralized messaging, where every application/client talks to a centralized messaging broker, even for p2p communication. In Decentralized MOM, the clients communicate to each other directly. 

The Java object message before delivering to the non-java client has to be converted after receiving the message from Queue/Topic using the specification of non-java Client.

For example, if you are trying to retrieve Stock symbols, does it come under P2P or Pub/SUb model.

Hi All,I have gone thu the replies from all of you and collectively the difference is correct.P2P and Pub-Sub are two different mechanism. There could be M senders and N receivers in both the cases.In...

HI,    JMS is an JAVA API for writting applications to communicate with Message Queue or Topics. For sending and receiving messages across application servers JMS applications are used....

JavaMail API provides a platform independent and protocol independent framework to build Java technology based email client applications. The JavaMail API provides facilities for reading and sending e...

Java Mail is between system and people, between people and people, between system and file, between people and file... Where as JMS (Java Message Services) is between Java software components...

Could any one of you give some sample code for JMS and MDB

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 messag...

There are two types of messagings models. 1.Peer to Peer model (p to p) 2.Publisher to Subscriber(pub-sub)  peer to peer model is 1-1 model.  In this model one client can...

Message System Types Two messaging systems models are in common use.  Publish/Subscribe A publish/subscribe (pub/sub) messaging system supports an event driven model where informat...

1. class files - Either they must be in WEB-INF\classes directory OR you can package them as JAR and put in WEB-INF\lib2. JSP files - Depends how do you design your arch. If you have controller/delega...

yes

Thanks for the valuable information ....

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.createDurableSubscri...

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 a...

A producer is the client application that plays the role of a message sender in JMS API.

A consumer is the client application that plays the role of a message receiver in JMS API.

Messaging lets a servlet delegate processing to a batch process either on the same machine or on a separate machine. The servlet creates a message and sends it to a queue. The servlet immediately comp...

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 interfac...

JMS stands for java messaging services,it is component used to communicate between the two Applications,In a Synchronous or Asynchronous mode.Simillar to the Java Mail,but the difference between the j...