Interview Questions.

Question 1. What Is Activemq?

Answer :

Apache ActiveMQ is an open source message broker written in Java together with a complete Java Message Service (JMS) consumer. It presents "Enterprise Features" which in this situation method fostering the communique from more than one patron or server.

Question 2. What Is Use Of Activemq Instead Of Other Options Like Database?

Answer :

Activemq is used to reliably speak among two allotted processes. It can save messages in a database to communicate among to strategies, however as quickly as the message is obtained you would ought to delete the message. That approach a row insert and delete for each message. When you try and scale that up speaking hundreds of messages consistent with 2d, databases generally tend to fall over.
Message orientated middleware like ActiveMQ then again are build to deal with the ones use cases. They asume that messages in a healthful system might be deleted right away and might do optimizations to keep away from the overhead. It can also push messages to consumers instead of a consumer having to ballot  for brand new message through doing a SQL question. This in addition reduces the latency worried in processing new messages being sent into the system.
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Question three. What Is Jms?

Answer :

Java Message Service (JMS) is an application program interface (API) from Sun Microsystems that supports the formal verbal exchange known as messaging between computers in a community. Sun's JMS gives a common interface to conventional messaging protocols and also to important messaging offerings in aid of Java packages. ActiveMQ is based on JMS.

Question 4. How Does Activemq Compare To Amqp ?

Answer :

AMQP stands for the Advanced Message Queue Protocol and is a specification for how messaging clients and agents can interoperate. AMQP is a specification of a wire-degree protocol for purchaser to message broking verbal exchange. It isn't always a messaging system like ActiveMQ, however only a messaging protocol.

ActiveMQ now implements AMQP 1.Zero

ActiveMQ additionally supports other open twine protocols:

    OpenWire, a quick binary layout
    Stomp, a simple and without difficulty implemented textual content based-protocol
    MQTT, a compact binary layout for confined gadgets on an unreliable community

Through these protocols, ActiveMQ can aid clients in C, C++, C#, Ruby, Python, Perl, PHP, Pike and so on. AMQP is most similar to OpenWire, because both OpenWire and AMQP are designed for excessive performance messaging, through a binary (in place of text-primarily based) layout. As a textual content-based totally format, STOMP is much easier to enforce, but offers incredibly slower performance.

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Question five. How Do I Build But Disable The Unit Tests ?

Answer :

The take a look at instances in ActiveMQ can take a completely long time to run.

To disable this you could try the following
mvn install -Dmaven.Test.Skip=true

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Question 6. What Platforms Does Activemq Support?

Answer :

ActiveMQ 5.0-5.7 helps any Java platform of Java five.Zero or later. To run on 1.Four see these instructions. ActiveMQ five.8-5.10 require Java 6 or better and the releases from 5.11 onwards require Java 7 or later.

ActiveMQ is based on J2EE 1.4 or later and so implements JMS 1.1 and a JCA 1.Five Resource Adaptor.

We frequently test ActiveMQ on Windows, OS X, Linux even though we are aware of individuals who use AIX and Solaris too.

Question 7. How Does Activemq Compare To Artemis?

Answer :

Artemis is the codename used for the HornetQ code that became donated to the Apache Foundation.

It is feasible that Artemis will finally turn out to be the successor to ActiveMQ five.X (and that it might subsequently be branded as ActiveMQ 6.X), but no choice approximately that were made as of April 2015 as documented in that month's ActiveMQ Board Report.

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Question eight. How Does Activemq Compare To Fuse Message Broker ?

Answer :

Fuse Message Broker is an authorized distribution of Apache ActiveMQ provided by using FuseSource. FuseSource does all of its development and bug fixes as a part of the Apache ActiveMQ community, so there are not any practical differences among the two. FuseSource can also do extra common releases than Apache, so it's far feasible to get bug fixes from a Fuse Message Broker release earlier than from an reputable Apache ActiveMQ launch.

Question nine. Mention Few Features Of Activemq ?

Answer :

JMS compliance : ActiveMQ is an implementation of JMS ,so have all blessings that JMS have.

Persistent : ActiveMQ has inbuilt KahaDB and it is able to be plugged to outside DB as properly.

Security : ActiveMQ provides authentication and authorization.

Cluster : Many ActiveMQ dealer can make cluster to work together.

Client API : ActiveMQ presents patron API for lots languages.

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Question 10. How Does Openwire Compare To Stomp ?

Answer :

OpenWire is the local protocol that Apache ActiveMQ makes use of. It is designed for overall performance and size at the wire - sacrificing some ease of implementation with higher performance and decreased community bandwidth as a concern. OpenWire turned into first launched in Apache ActiveMQ four.Zero.

Stomp is a less complicated textual content based totally protocol that's designed to be quite simple to put in force in some hours in any language or platform (e.G. You may use a telnet consumer to communicate via Stomp). A Stomp customer isn't always going to be as green as an consumer that uses
OpenWire, however it tons simpler so you can commonly be up and going for walks with it a good deal quicker.

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Question 11. How Can I Monitor The Connection With The Broker ?

Answer :

You can reveal the status of the connection with the dealer thru the addTransportListener() technique at the ActiveMQConnection.

This method takes a TransportListener that is notified as the relationship is hooked up & dropped. It also allows you to work with the Failover Transport yet nevertheless realize the status of the relationship.

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Question 12. How Does Activemq Compare To Spread Toolkit ?

Answer :

Spread Toolkit is a C++ library for messaging and only has partial support for JMS. It does not help durable messaging, transactions, XA or full JMS 1.1. It is likewise dependent on a local code Spread daemon running on the system.

Apache ActiveMQ however is the JMS company utilized in Apache Geronimo and is J2EE 1.Four licensed in Geronimo and is one hundred% pure Java. ActiveMQ supports brief and durable messaging, transactions, XA, J2EE 1.4, JMS 1.1, JCA 1.5 as well as hundreds of different capabilities like Message Groups and Clustering.

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