Top 50 Mulesoft Interview Questions – 2019 Updated

Q.1 What is MuleESB?

Donkey ESB is a Java-based endeavor benefit transport (ESB) and joining stage, the designer can associate their application with ESB. Donkey utilizes the administration situated design. Aside from of the diverse innovations the applications use, including JMS, Web Services, SMTP, HTTP. The upside of ESB, it permits conveying diverse application. Messages can be any organization SOAP to JSON. Donkey ESB Development gives the informing system that empowers the trading of information among application.

Q.2 Why Mule ESB?

Donkey ESB is lightweight incorporation structure however exceptionally adaptable, enabling you to begin the little application and interface different applications. Donkey deals with every one of the associations among applications and segments straightforwardly, ESB will deal with the different application, we can without much of a stretch coordinate outsider application utilizing Mule.

Q.3 What is Shared Context?

Shared Context: Context is a brief region which is made alongside Service Message Object (SMO) in the Mediation Flows. Shared Context is a sort of setting which is available in the SMO. Shared Context is chiefly utilized when we are utilizing Aggregation process where we have to Iterate the BO for Certain occasions. Shared Context keeps up Aggregation information between Aggregation (FanOut and FanIn) natives. The Content (information) which is available in the mutual setting BO does not hold on crosswise over Request and Response streams for example The Data in the Shared Context which is utilized in Request stream can’t be utilized again in Response stream.

Q.4 What is Transient Context?

Transient Context: Used for passing qualities between Mediation natives inside the present stream — either the demand stream or the reactions stream. The transient setting can’t connect solicitations and reactions and subsequently can’t be utilized over.

Utilized when you need to spare an information message before an administration conjures call (inside a demand or reaction stream). After the administrations summon call, the following crude can make another message by consolidating the administration conjure a reaction and the first message put away in the transient setting.

Q.5 What are the Features of Mule ESB?

An ESB is an utilized for coordination utilizing an administration arranged methodology. Its principle highlights are:

Set of Service Container

Message Transformation Service

Message Routing Service

Web Service Security

Q.6 What are Web Services?

Web benefit is a capacity or program in any dialect that can be gotten to over HTTP. Message organization can be XML or JSON or some other program as long as alternate projects can comprehend and convey. Web administrations can be synchronous or offbeat. Any web benefit has a server-customer relationship. Any web administration can have numerous customers. Eg: When a movement entrance is moving tickets of an aircraft, Portal is the customer and the Airline is the server as it is moving its administration.

Q.7 What are different sorts of Exception Handling?

Decision Exception Handling.

Find Exception Handling.

Rollback Exception Handling.

Worldwide Exception Handling.

Default Exception Handling.

Q.8 Various sorts of factors in donkey?

Record Variable.

Stream Variable.

Session Variable.

Q.9 What’s the distinction among SOAP and REST?

REST is quite often going to be quicker. The fundamental favorable position of SOAP is that it gives a component to administrations to depict themselves to customers and to publicize their reality.

REST is substantially more lightweight and can be executed utilizing practically any device, prompting lower transmission capacity and shorter expectation to absorb information. Nonetheless, the customers need to realize what to send and what’s in store

All in all, When you’re distributing an API to the outside world that is either unpredictable or liable to change, SOAP will be increasingly valuable. Other than that, REST is generally the better choice.

Q.10 What is Correlation Context?

Relationship Context: Used when Mediation natives need to pass esteems from the demand stream to the reaction stream. Used to pass esteems from the demand message onto the reaction.

Q.11 What is the usefulness of Fan-in and Fan-out?

Fan-out: We can utilize the Fan Out crude to flame the yield terminal once (with the information message) or fire the yield terminal on various occasions. You can utilize Fan Out in seclusion or as a feature of a Fan Out and Fan In mix.

Fan-In: Fan In is constantly banded together with a Fan Out in indistinguishable stream and acts from a choice point for when to proceed with stream execution. It gets various messages until the point when a choice point is come to, so, all things considered the last message to be gotten is engendered to the yield terminal. The Fan In crude may just be utilized in blend with Fan Out.

Q.12 What is RAML and why we use it?

RAML – RESTful API Modeling Language

RAML is like WSDL, it contains endpoint URL, ask for/reaction pattern, HTTP strategies and inquiry and URI parameter.

RAML helps the customer (a shopper of the administration) know, what the administration is and what/how all tasks can be conjured.

RAML helps the engineer in making the underlying structure of this API. RAML can likewise be utilized for documentation reason.

Q.13 How to discover when the undertaking needs ESB?

ESB usage isn’t reasonable for all tasks. Legitimate examination ought to be done if the utilization of ESB will truly profit the task.

A portion of the focuses to be considered while examining the need of ESB are as per the following:

On the off chance that the task requires incorporating at least 3 applications/administrations. On the off chance that the need is to convey between two applications, utilizing point-to-point coordination would get the job done.

On the off chance that the venture would should be scaled in future where it may be expected to associate with more administrations in future. Not all activities require this as they may perform not so huge an errand.

On the off chance that the task needs message steering abilities, for example, forking and totaling message streams. Such highlights are not required by all ventures.

Is the engineering of what is to be accomplished clear. It’s vastly improved to do straightforward POCs coordinating little parts to assess the advantages.

Most ESBs are an exorbitant issue. Does the task spending plan permit the utilization of ESB?

Q.14 What are the distinctive kinds of Flow Processing Strategies?

There are six distinct kinds of Flow Processing Strategies. They are

Nonconcurrent Flow Processing Strategy.

Custom Processing Strategy.

String Per Processing Strategy.

Lined Asynchronous Flow Processing Strategy.

Synchronous Flow Processing Strategy.

Non-blocking Flow Processing Strategy.

Lined Flow Processing Strategy.

Q.15 What are the distinctive sorts of stream?

Subflow – A subflow is constantly synchronous. It is like a synchronous stream, subflow executes in a similar string of the calling procedure. Calling process triggers the sub-stream and sits tight for it to finish and continues once the sub-stream has finished.

Synchronous Flow– Same as sub-stream, the main contrast is that in synchronous streams you have to independently characterize an exemption technique to it, it doesn’t acquire the special case system of its calling stream.

Offbeat Flow – As in sub-stream and synchronous stream, calling process triggers the sub-stream and hangs tight for it to finish; for nonconcurrent stream the stream, calling process triggers an offbeat stream and advances to its next action. An offbeat stream executes in parallel to its calling/parent stream in an alternate string. A nonconcurrent stream does not restore its yield to its parent/calling stream.

Private Flow – stream that does not have an inbound connector in the source. Means a private stream can’t begin its own on getting the inbound message as it doesn’t have any inbound connector, A private stream must be called utilizing stream ref same as sub-stream.

Q 16. What is Mule ESB?

Donkey ESB otherwise called donkey, is a lightweight Java-based endeavor benefit transport (ESB) and mix stage that enables engineers to interface applications together rapidly and effectively, empowering them to trade information. Donkey ESB empowers simple joining of existing frameworks, paying little mind to the diverse innovations that the applications use, including JMS, Web Services, JDBC, HTTP, and that’s only the tip of the iceberg.

Donkey is the runtime motor of Anypoint Platform.

Clarify Enterprise Service Bus (ESB).

An endeavor benefit transport (ESB) is programming engineering for middleware that gives crucial administrations to increasingly complex models. For instance, an ESB consolidates the highlights required to execute an administration arranged engineering (SOA). In a general sense, an ESB can be thought of as an instrument that oversees access to applications and administrations (particularly heritage renditions) to exhibit a solitary, basic, and reliable interface to end-clients by means of Web-or structures based customer side front closures.

Preferences of Mule ESB.

Administration creation and facilitating uncovered and has reusable administrations, utilizing the ESB as a lightweight administration compartment.

Administration intercession shields administrations from message organizations and conventions, separate business rationale from informing, and empower area autonomous administration calls.

Message directing course, channel, total, and re-grouping messages dependent on substance and guidelines.

Information change trade information crosswise over differing configurations and transport conventions.

Q 17. Why Mule is favored than other ESB usage?

Donkey is lightweight however exceptionally adaptable, enabling you to begin little and interface more applications after some time. The ESB deals with every one of the collaborations among applications and parts straightforwardly, paying little heed to whether they exist in the equivalent virtual machine or over the Internet, and paying little heed to the basic transport convention utilized.

A few business ESB execution give constrained usefulness or based over a current application server or informing server, locking you into that explicit seller. Donkey is seller nonpartisan, so unique merchant executions can connect to it. You are never secured to an explicit merchant when you use Mule.

Q 18. At the point when do we require ESB?

Donkey and different ESBs offer genuine incentive in situations where there are something like a couple of incorporation focuses or possibly 3 applications to coordinate. They are likewise appropriate to situations where free coupling, versatility and heartiness are required.

Q 19. How Mule ESB functions?

Donkey depends on the idea of Event Driven Architecture (EDA), works by reacting to messages started by outer assets (that is, occasions). Donkey applications acknowledge and process occasions as messages through a few message processors connected together a stream. On the other hand, huge or spilling messages can be prepared as records in a bunch work.

Each Mule stream contains a progression of message processors that acknowledge, at that point procedure messages. Donkey applications more often than not contain various connected streams as well as group employments, which, in mix, play out the joining required for your utilization case.

Clarify Flow in Mule ESB.

A stream is the develop inside which you connect together a few individual components to deal with the receipt, handling, and inevitable directing of a message.

A Flow is a succession of message-preparing occasions. A message that enters a stream may go through a wide assortment of processors. In the precedent graph beneath, Mule gets the message through a demand reaction inbound endpoint, changes the substance into another arrangement, and procedures the business rationale in a part before restoring a reaction by means of the message source.

Clarify Batch Jobs in Mule ESB.

A cluster work is a best dimension component in Mule ESB which exists outside all Mule streams. Bunch employments split huge messages into records which Mule forms nonconcurrently; similarly as streams process messages, group occupations process records.

A bunch work contains at least one cluster steps which, thus, contain any number of message processors that follow up on records.

A cluster work executes when activated by either a clump agent in a Mule stream or a message source in a bunch tolerating input. whenever activated, Mule makes another cluster work example. At the point when all records have gone through all bunch steps, the group work case closes and the clump work result can be condensed in an answer to show which records succeeded and which fizzled amid preparing.

Q 20. What are Message Sources is Mule ESB?

Message sources in Mule are generally Anypoint Connectors, components which give availability to an explicit outside source, either by means of a standard convention, (for example, HTTP, FTP, SMTP) or an outsider API, (for example,, Twitter, or MongoDB.)

Clarify Mule Expression Language (MEL).

MEL is a lightweight, Mule-explicit articulation dialect that you can use to get to and assess the information in the payload, properties and factors of a Mule message. Available and usable from inside for all intents and purposes each message processor in Mule, MEL empowers you to rapidly and richly channel, course, or generally follow up on the distinctive parts of the Mule message object.

Q 21. What are the other accessible ESB executions separated from Mule?

There are many open source and business ESB executions accessible.

All major JEE sellers (BEA, IBM, Oracle, Sun) have an ESB in their inventory. It is unremarkably founded on their middleware advancements and is as a rule at the center of an a lot more extensive SOA item suite. There are likewise some business ESBs, for example, Progress Software, IONA Technologies, Windows Azure administration transport and Software AG.

Apache Camel, Apache ServiceMix, Apache Synapse, Red Hat Fuse ESB (in view of Apache Camel), JBoss ESB, Spring Integration, Talend Open Studio for ESB are a portion of the open source systems.

The entire rundown is recorded here.

Distinction among ESB and JMS.

ESB gives the middleware and interfaces that enable organizations to associate their applications without composing code.

JMS gives informing capacity and encourages correspondence between the modules/applications.

Variable sorts accessible in Mule ESB.

Stream Variable – that fills in as example properties,

Session Variable – that demonstrations ike session properties,

Record Variable – accessible just in Batch Job Flows.

Highlights of ESB.


Message change,

Message upgrade,

convention change,

Administration mapping,

Message preparing,

Process movement,

Administration arrangement,

Exchange the executives,

Endeavor reconciliation configuration designs,

also, Security.

Clarify the Mule message with regards to Mule Flow.

The Mule message is the information that goes through an application by means of at least one streams. It comprises of two principle parts:

The message header, which contains metadata about the message.

The message payload, which contains your business-explicit information.

A Mule message is, itself, inserted inside a Mule message object. Some Mule message articles may contain factors, connections, and special case payloads. Be that as it may, as connections and exemption payloads are not as often as possible utilized or controlled.

Q 22. What is the MuleSoft Anypoint stage?

Anypoint Platform is a half breed combination stage that empowers to effectively fabricate and quickly scale an application system of applications, information, and gadgets through APIs and incorporations.

I have no involvement on Mule ESB, however I have information on it. In the event that questioner asks situation based inquiries what I have to answer please encourage me.

Posted on Jan 4, 2019 by Adithya.

A debt of gratitude is in order for your inquiry. Situation based inquiries more often than not will be examination based, for instance, tibco versus donkey or some other mix structure. Likewise there may inquiries on donkey exchanges. Attempt to comprehend the inquiry and endeavor to reply on how you would essentially approach the situation. Attempt to analyze the situation and clarify dependent on your insight.

Q 23. How to execute Custom Connectors in Mule ESB?

We may build up another custom connector venture in Mulesoft Any Point studio and it includes the underneath steps.

Set up Connector Project in Anypoint studio,

Compose Connector Code,

Compose Connector unit Tests (discretionary however prescribed),

Report the Connector for reference,

Bundle the custom Connector. 

Leave a Comment

Your email address will not be published. Required fields are marked *