MuleESB Interview Questions and Answers 2021 - Orange TechnoMind

Orange TechnoMind 06-Jan-2021
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We have included Mulesoft Interview Questions and Answers that are mostly asked in an interview.This course is intended for basic to advanced learners who are preparing for their MuleSoft Interviews that helps you in cracking your interview & acquire dream career.

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What is Mulesoft?

Mulesoft is the most widely used integration platform. Here we will find 2 types Mule ESB and Cloud Hub for connecting enterprise and SAAS applications in the on-premises and cloud. Mulesoft allows developers to connect applications together quickly and easily and it helps in exchanging the data.


What is ESB?

An enterprise service bus (ESB) is software program architecture for middleware that provides essential services for more complicated architectures.


What's Mule ESB?

Mule ESB is a Java-based enterprise service bus (ESB) and integration platform, developer can join their application with ESB. Mule use provider oriented structure. aside from of the specific technologies the programs use, which include JMS, web services, SMTP, HTTP. The benefit of ESB, it’s permit communicate distinct application. Messages can be any format soap to JSON. Mule ESB development offer messaging framework that enable change of data among application.


Can you provide details on MuleSoft certification?

In MuleSoft, there are two categories of Certification:

1. Mule Soft Certified Developer.

Integration and API Associate.

API Design Associate.

Integration Professional.

2. MuleSoft Certified Architect.


What is MuleSoft Anypoint platform used for?

MuleSoft’s Anypoint Platform of integration products is designed to tie together software as a service (SaaS) and on-premises software.


Is MuleSoft open source?

MuleSoft is open source technology and it offers open source SOA middleware and related products.


What are the Features of Mule ESB?

Its main features are:
1. Set of Service Container
2. Message Transformation Service
3. Message Routing Service
4. Web Service Security


Explain the types of variables in mule?

There are 3 types of variables available in a mule.

  • Flow Variable
  • Session Variable
  • Record Variable


What are different types of Primitives used in Mediation?

These are the different types of primitives in mediation:
1. Message Filter
2. Type Filter
3. Endpoint Lookup
4. Service Invoke
5. Fan-out
6. Fan-in
8. BO Map
9. Message Element Setter
10. DB lookup
11. Data Handler
12. Custom Mediation
13. Header Setters
14. Message Logger
15. Even Emitter
16. Stop
17. Fail
18. Sub Flow


What are various types of Exception Handling?
1. Choice Exception Handling.
2. Catch Exception Handling.
3. Rollback Exception Handling.
4. Global Exception Handling.
5. Default Exception Handling.


What are web services?

Web service is a functionality or a small piece of application in any programming language that can be accessed over HTTP. Message format may be XML or JSON or some other application so long as the other applications can understand and communicate. A web service may be of synchronous or asynchronous type. Any web service has a server-client relationship and it is able to have more than one clients.


What is the use of web service?

Web services are XML-primarily based data change systems that use the internet for direct software-to-software interaction. These structures can include programs, objects, messages, or documents. a web service is a set of open protocols and standards used for replacing data between programs or systems.


What are the different types of Web services?

There are mainly two types of web services.

  1. SOAP web services.
  2. RESTful web services.


What is the difference between SOAP and REST?



Stands for Simple Object Access Protocol

Stands for REpresentational State Transfer


 Architectural style

To expose the business logic SOAP uses services interfaces

To expose business logic REST uses URI

SOAP defines standards to be strictly followed

REST does not define too much standards like SOAP

Permits XML data format only

Permits different data format such as Plain text, HTML, XML, JSON etc.

SOAP requires more bandwidth and resource than REST

REST requires less bandwidth and resource than SOAP

Defines its own security

RESTful web services inherit security measures from the underlying transport.


What is Shared Context?

Shared Context is a temporary region that is created at the side of service Message object (SMO) in the Mediation Flows. Shared Context is a kind of context that's present inside the SMO. Shared Context is especially used while we are using Aggregation method where we want to iterate the BO for certain times. Shared Context maintains Aggregation information between Aggregation primitives. The content (data) that's present inside the shared context BO does no longer persist across Request and response flows i.e. The data inside the Shared Context that is used in Request flow cannot be used once more in response flow.


What's Transient Context?

Transient Context is used for passing values between Mediation primitives in the present day flow — either the request flow or the responses flow. The transient context can't link requests and responses and for this reason can't be used across.Used when you need to save an input message before a service invokes call (inside a request or response flow). After the services invoke call, the following primitive can create each different message by means of using combining the service invoke response and the original message saved within the transient context.


What is Correlation Context?

Correlation Context is used when Mediation primitives want to pass values from the request flow to the response flow.Used to pass values from the request message onto the response.


What is the difference between ESB and JMS ?

ESB offers the middleware and interfaces that permit companies to attach their applications with out writing code.

JMS offers messaging functionality and enables communication between the modules/applications.


What are Flow Processing Strategies?

  • Synchronous Flow Processing Strategy
  • Queued Flow Processing Strategy
  • Asynchronous Flow Processing Strategy
  • Thread Per Processing Strategy
  • Queued Asynchronous Flow Processing Strategy
  • Non-blocking Flow Processing Strategy
  • Custom Processing Strategy


How can you implement a loop in mediation?

By using Fan-in and Fan-out primitive.


What is the difference among SDO and SMO?

SDO: Service Data Object is the illustration of the variable or object.

SMO: The SMO model is a sample for using SDO data objects to symbolize messages


What is the distinction among stop and fail?

Stop: Stops a specific path in the flow, without generating an exception.

Fail: Generates a failure within the flow.


 What are the different ESBs in the market?

There are various ESB's available in the market. Some are open source, some licenced:

1. Talend

2. Mule ESB

3. JBoss Fuse ESB


What's Connector In Mule ?

A connector is in charge of controlling the usage of a specific protocol. It is configured with parameters which can be specific to this protocol and holds any state that can be shared with the underlying entities in charge of the actual communications.


What is Endpoint In Mule ?

An endpoint represents the unique utilization of a protocol, whether it is for listening/polling, reading from, or writing to a specific goal destination. for this reason it controls what underlying entities might be used with the connector they rely upon. The goal destination itself is described as a URI. Relying on the connector, the URI will endure a distinctive that means; for example, it can constitute a URL or a JMS destination.


What is Transformer In Mule ?

A transformer looks after translating the content of a message from one form to some other. it is feasible to chain transformers to cumulate their outcomes. Transformers can kick in at exclusive levels while a message transits through a service


What’s Router In Mule ?

Routers play a critical role in controlling the trajectory a message will observe when it transits in Mule. They’re the gatekeepers of the endpoints of a servicelooking after maintaining messages on the right succession of tracks so they can attain their supposed destinationsCertain routers act like the big category yards: they are able to splitsort, or regroup messages primarily based on certain conditions.

What is Bridge component In Mule ?

A bridge component is used to skip the messages from the inbound router to the outbound one. A bridge is an impartial factor it does no longer carry out any action or modify messages that it processes.

What’s Vm transport In Mule?

The VM transport is a unique form of transport which you’ll use to ship messages through memoryThese messages never leave the JVM the Mule instance is running in.

What’s caching and why to use it?

Caching is an idea with is used to store regularly used data inside the memoryfile system or database which saves processing time and load if it would need to be accessed from original source location every time.
Give an explanation for the Mule message inside the context of Mule flow.
The Mule message is the data that passes through an application through one or greater flows. It consists of most important components:
• The message header, which includes metadata approximately the message.
• The message payload, which includes your commercial enterprise-specific data.





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