2021 Best MuleSoft Interview Questions [Updated]

Best MuleSoft Interview Questions: When going for an interview, most candidates are nervous. They feel confused and lost as tracking down the most commonly asked interview questions seems impossible.

But we have here compiled a list of the most important Mulesoft interview questions. These questions are divided into three categories. These categories are according to the difficulty level of the questions.

Another crucial factor to crackdown interview is your confidence level, personality, way of answering or speaking, and your work experience.

Make sure you have the basic Mulesoft concepts clear before you dive into the below important interview questions.

Learn About Basic MuleSoft Interview Questions

Table of Contents

What is MuleSoft and how does it work?

MuleSoft is a cloud-based cluster-based solution provider that connects data, applications, and APIs on-premises. It is built on the “AnyPoint Connectivity Model,” which joins existing SaaS-based apps or a collection of APIs via a single API interface. With this service-oriented architecture-based integration support, it is flexible in accessing all essential apps. MuleSoft manages MuleSoft’s programmable web portal, which is used to create web, mobile, and other user applications.

What is the ESB?

The Mule is a type of mule that is ESB is a Java-based integration platform that allows developers to instantly connect and share data between applications. It works with the existing system regardless of the technologies used by the applications, such as Web Services, HTTP, JDBC, JMS, and so on.

In MuleSoft, what are the different forms of exception handling?

In MuleSoft, there are five different forms of exception handling.

  • Global Exception Handling.
  • Catch Exception Handling.
  • Choice Exception Handling.
  • Default Exception Handling.
  • Rollback Exception Handling.

How do you use Mule to create and consume SOAP services?

SOAP services are generated in the same way as Mule projects are established using RAML. The distinction is that instead of RAML, Concert WSDL is imported, and SOAP services are accessed via Web Service Consumer or Mule Flow CXF components.

What are the benefits of implementing Mule ESB?

Mule ESB is a lightweight and scalable integration platform that allows developers to quickly start and connect many applications. Mule manages component interchange, application transparency, and ESB, which is handled by a variety of apps. Mule makes it simple to integrate third-party apps.

What are the Mule ESB features?

An ESB is a service-oriented architecture that is used to integrate systems. Among the features are:

  • Message Routing Service.
  • Message Transformation Service.
  • Set of Service Container.
  • Web Service Security.

What are all of the configurations needed for the JDBC Adapter to work?

The JDBC adapter configuration is simple; it only requires a data source to connect to and configure with a database. If the database has secure access, a security authentication procedure must be built.

What is the distinction between SDO and SMO?

  • SDO: A Service Data Object (SDO) is a variable or object that represents a variable or object.
  • SMO: It is a model pattern that is used to express messages in SDO Data Objects.

What is the difference between Enterprise Service Bus (ESB) and Java Management Service (JMS)?

ESB provides middleware and interface services that enable businesses to link their applications without having to write any code.

JMS is a messaging and communication system that connects the modules of an application.

What is Mule Data Integrator, and how does it work?

A mule data integrator is a technology that visualizes data to map it. It has a drag-and-drop interface that allows developers to code quickly.

Moderate MuleSoft Interview Questions

In MuleSoft, what are the various types of variables?

Variables in MuleSoft include:

  • Flow Variable: This variable is used to set or remove variables associated with a specific message in the current flow.
  • Batch processing flows employ the Record Variable.
  • Session Variable: Throughout the lifecycle, this variable is used to set or remove variables associated with a certain message.

What is the difference between Fan-in and Fan-out?

Fan-Out: The Fanout primitive can be used to either fire the output terminal once (with the input message) or numerous times. You can use the Fanout on its own or in conjunction with the Fan-out and Fan.

Fan-In: In the same flow, Fan-In is always paired with Fan-out and serves as a decision point for when to continue with flow execution. It will receive a number of messages until it reaches a decision point, at which point the most recent message received will be sent to the output terminal. The rudimentary Fan can only be used in conjunction with the Fan-out.

What Is Mule’s Filter?

Filters are seen as a valuable addition to routers. Filters give routers the intelligence they need to make intelligent judgments about what to do with messages in transit. Some filters go so far as to analyze the message content in-depth for a certain value on which their result is usually based.

What is a Mule UMO, exactly?

A Mule UMO stands for “Universal Message Object.”

UMO is no longer in use. These are the components that have been dubbed “Service Components” in recent years.

What are the different types of endpoints in Mule ESB?

HTTP, JMS, IMAP, SMTP, and AJAX are all examples of Endpoints supported in Mule.

What are Web Services, and what do they do?

A web service is a piece of functionality or a small application written in any programming language that can be accessed via HTTP. JSON, XML, or any other program format can be used as long as the other applications can comprehend and communicate with it.

Asynchronous or asynchronous Web services can be used. There can be several clients for any web service that has a server-client interaction.

What are the different types of Web services?

Web services can be divided into two categories:

  • SOAP web services.
  • RESTful web services.

What’s the difference between fail and stop?

Stop: Stop is used to bring a certain path in the flow to a halt without throwing an exception.

Fail: This variable is used to cause a flow failure.

What is Mule Expression Language, and how does it work?

Mule Expression Language (MEL) is a lightweight mule-specific language for accessing and evaluating data in the payload.

What does SDO stand for?

A Service Data Object is the full form of SDO.

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Advance MuleSoft Interview Questions

In Mule ESB, what are inbound and outbound endpoints?

Message sources (http://www.mulesoft.org/documentation/display/current/Message+Sources) are inbound endpoints that, as the name suggests, are where messages are created. External events (such as an incoming HTTP request or JMS message) or polling can be used to create them (like files in a directory).

Outbound endpoints are described as anything else visible in a flow (excluding exception strategies) that does something with the message in-flight flow, such as message processors (http://www.mulesoft.org/documentation/display/current/Message+Processors).

What is the meaning of transient context?

It’s the context that’s utilized to pass values between the request flow, responses flow or mediation primitives in the current flow. Because the temporary context is unable to link requests and responses, it cannot be used between applications. It’s utilized when a service needs to save an input message before initiating a call. Following the service’s call, the next primitive can be used to combine the original message to create a new message. Responses are elicited by the service and kept in the transitory context.

What are the benefits of employing ESB?

The benefits include: It gives a high-level control facility through a web-based gateway.

  • ESB gives a variety of communication options by utilizing SaaS-based apps.
  • API and Analytical management are provided via ESB.
  • ESB has a number of features that can be used to repair issues and automate testing.
  • EDI (Electronic Data Interchange)/B2B integration (business to business).
  • Real-time integration methods are used to support batch integration.

In MuleSoft, what is a Router?

MuleSoft’s router is a crucial service. It completes and assigns the running territory for messages moving from one service to the next. The router decides on a transitory control processing that transmits the message from one source to another. It’s also known as an endpoint service gatekeeper. It keeps track of the targeted sequences to assure message delivery to the intended recipient. Routers are a collection of categorized actions such as splitting, sorting, grouping, and regrouping messages based on conditions or mappings.

How can you know if an ESB is required in a project?

To prevent making needless arrangements, a project’s application requirements must be thoroughly examined. By functioning on a large configuration of multipurpose application support, ESB improves the project needs in a variety of ways. Many factors influence the outcome of the analysis, including.

  • When a project requires a set of actions for extra applications and servers, where two or more complex resources interact.
  • When a project necessitates communication between various apps via a single configuration during a broad scale-up for future scope.
  • When a project requires message routing from one end to the other, such as forking and aggregating routing messages.
  • When a project requires application support, it necessitates a significant investment.

How do you integrate Mule HQ with Mule?

Configuration of Mule

In your Mule settings, add the following code snippet:


Begin the Mule instance.

Ascertain that the HQ agent is operating on the same server as the Mule instance and that it is pointing to the correct HQ server.

To see if information about the Mule instance is being received, go to the Mule HQ server page.

What is a Restful Web Service, and how does it work?

Built on the REST architecture, a Restful Web Service is a lightweight, maintainable, and scalable service. Restful Web Services allow you to expose API from your application to the calling client in a safe, standardized, and stateless manner. The Restful service allows the calling client to conduct predefined activities.

What are the benefits of using SOAP?

SOAP’s benefits include:

  • SOAP is an excellent method for web services to communicate with client applications.
  • SOAP (Simple Object Access Protocol) is a lightweight protocol for exchanging data between applications.
  • On Windows and Linux platforms, the SOAP protocol can be used to run applications written in any programming language.
  • It is not necessary to customize web services established on the SOAP protocol in order for them to work on the WWW.

What does it mean to have a shared context?

Context is a temporary area that is produced in the Mediation Flows along with the Service Message Object (SMO). The SMO contains a sort of context called shared context. When we use the Aggregation process and need to iterate the BO for specific times, we use Shared Context. Aggregation data is shared amongst Aggregation primitives using Shared Context. The data in the shared context BO does not persist throughout Request and Response flows, i.e. Data in the Shared Context that is used in Request flow cannot be used in Response flow.

What is the polling frequency in MuleSoft’s file connector?

To achieve this, set the polling frequency value to a few milliseconds when you need a new file inbound endpoint to poll direction for reading new content. The polling frequency determines the poll’s value.


The above list of questions is accompanied by brief and to-the-point answers. These important interview questions will help you in last-minute revisions. It will also assist you in understanding the pattern of questions asked in interviews.

Revising and practicing these questions will give you the confidence to tackle all kinds of tricky questions in the interview.

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