ActiveMQ Interview Questions

In this age of business expansion and advancement in technology, many big organizations are always looking for methods to increase their business. One main factor governing the expansion of any business is communication. If managers and other office staff are not able to communicate among different clients, then there will be no plausible way for their business to increase its revenue. ActiveMQ is a boon in terms of open source communication software that only allows rapid and effective communication between the client and the broker, but also provides multitudes of efficient features that will always attract more clients.

In order to take their companies to higher notches, companies are adopting ActiveMQ as their source for communication. If you are looking for a job as a programmer or coder then ActiveMQ is one language that will come handy. Recruiters ask a combination of tricky and easy ActiveMQ interview questions that can sometimes leave your mind – boggling. Read below some of the most frequent and important ActiveMQ interview questions to not only get an idea about the programming language and get you your dream job!

#1 Describe ActiveMQ

ActiveMQ is an open source message broker that is basically written using Java programming language. It is mainly written using the Java Message Service (JMS). The benefit of such an open source – messaging broker is that it provides some executive features to enterprises, which implies that a particular communication can be promoted from one client to another.

#2 What is the difference between synchronous and asynchronous messages?

S.NoSynchronous messagesAsynchronous messages
1Synchronous messages are the type of messages during which a client has to wait for the server to send a response to a particular message that is generated.On the other hand, asynchronous messages are the types of messages where the client receives a quick response from the server.
2These type of messages are generally generated from the server end.These type of messages are generally generated when a trigger message is automatically sent to the server.
3Examples of synchronous messages include telephone calls, radio communications, etc.Examples of asynchronous messages include emails, blogs, SMS, etc.

#3 Write a code showing how one can change a default username or password mainly for ActiveMQ console.

The following code can help a user change a default username or password:

Change from

# Defines users that can access the web (console, demo, etc.)
# username: password [,rolename ...]
admin: admin, admin
user: user, user 

To

# Defines users that can access the web (console, demo, etc.)
# username: password [,rolename ...]
NewUserName: NewPassword, admin
user: user, user

#4 Differentiate between ActiveMQ and Mule

ActiveMQ is a messaging service that has extensive features to support both the broker and the client. While on the other hand, Mule is an ESB that has the capabilities to provide executive features to only the broker by exchanging messages among different software components.

The architecture of Mule is such that it is designed to deliver achievable programming setup for integration of applications between the database and an operating system. However, mule does not support any kind of system for native messaging, thus it is generally used alongside with ActiveMQ. In order to incorporate Mule with ActiveMQ, the user is required to introduce different and unique frameworks to define various boundaries for connectivity.

#5 What are some of the platforms supported by ActiveMQ?

Some of the common platforms supported by ActiveMQ include:

  • Any java platform that has an update of 5.0 or more.
  • J2EE 1.4 is another platform
  • JMS 1.1
  • JCA 1.5 resource adaptor

#6 What can one do to monitor the connection between a client and a broker?

In order to monitor the connection between the broker and the client, one needs to monitor the state of the connection using the “addTransportListener()” method.

#7 List some of the components used in JMS.

Some of the components available in JMS include:

  • Native clients
  • JMS client
  • Administered objects
  • JMS provider
  • Messages

#8 What are the advantages of using ActiveMQ over other databases?

The biggest advantage of using ActiveMQ over other databases is that it is one of the most reliable open sources to communicate and transfer information between different distributed processes.

#9 What are the core objects required by a JMS – enabled application?

The core objectives required by a JMS – enabled application include the following:

  • A connection object
  • An appropriate sender or receiver or publisher inside a particular session
  • One or more sessions that have the ability to provide context specific to message sending as well as receiving
  • A queue object within sessions representing destinations within brokers

#10 What is the difference between ActiveMQ and Fuse Message Broker?

Fuse Message Broker is an affirmed dispersion of Apache ActiveMQ given by FuseSource. FuseSource does the majority of its improvement and settles bugs as a component of the Apache ActiveMQ community, so there are no practical contrasts between the two. FuseSource may accomplish more successive discharges than Apache may, so it is conceivable to get bug fixes from a Fuse Message Broker discharge sooner than from an official Apache ActiveMQ discharge.

#11 What is the difference between ActiveMQ and AMQP?

AMQP is an acronym for Advanced Message Queue Protocol. It is a description as to how clients can send messages and how brokers can interpret and exchange the information. It follows a wire-level protocol between brokers and clients for effective and efficient communication. It is not entirely a messaging system alike ActiveMQ, however, it is only a messaging protocol.

#12 What is the procedure involved in handling an application server using the JMS connections?

  • With the assistance of an application server, the server session is made and it stores them within a pool
  • In order to place messages in JMS sessions, an association buyer utilizes the server’s session
  • A server session is the one that makes the JMS session
  • Application composed by Application software engineers makes the message audience.

#13 Describe JMS

JMS is an acronym for Java Message Service. It is an application program interface (API) primarily produced by Sun Microsystems. These applications support a variety of formal communications also known as messaging, especially between different computers within a network. The main function provided by JMS is that it acts as a common interface for standard messaging protocols and in addition, acts as a special messaging facility in order to support various Java programs.

#14 Explain the working of JMS in association with J2EE

The customer using the application such as the JavaBeans firstly parts and segments the web in order to be able to send or receive JMS message synchronously. In addition to that, the customer using the application can also likewise get message non – concurrently. With the assistance of message-driven beans, JMS supplier can alternatively execute the preparation of messages. The message-driven beans are a kind of big business bean that empowers the offbeat utilization of various kinds of messages. The task of sending and accepting message is completed and is in conveyed, which then permits JMS tasks and database to get inside a solitary exchange.

#15 Explain what is MOM in connection with JMS

The MOM (Message Oriented Middleware) is a service that fills in as a transition between two conveying segments. MOM is kept in between the customer and server so that it gives the office of passing message by utilizing the procedure lining. Until the customer does not demand to peruse the message, the messages will be kept away in line. By utilizing this procedure, the product segment can work freely of time.

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