Here are MuleSoft interview questions for fresher as well as experienced candidates to get the dream job.


1) What is MuleSoft?

MuleSoft is an integration platform for connecting enterprise and SaaS applications in the cloud and on-premise.

2) List types of variables in MuleSoft

Types of variables in MuleSoft are:

  • Flow Variable: It is used to either set or removes variables tied to a particular message in the current flow.
  • Record Variable: It is used for batch processing flows.
  • Session Variable: This variable is used to either set or remove variables tied to a particular message for the complete lifecycle.

3) What is fan-in?

Fan-in helps in taking a decision to continue flow execution. It be used in combination with fan out.

4) What is a fan-out?

Fan out is primitive that can be used to input messages through the output terminal once or more than one time. It can also be used as a combination of both fan-out and fan-in.

5) Mention the features of Mule ESB

The features of Mule ESB are:

  • Offer SLA (Service Level Agreement) monitoring and API management facility.
  • It has easy to use and drag and drop graphical design.
  • Mule ESB provides high scalability.
  • It enables developers to deploy in one click cloud or on-premise deployments.

6) Mention the basic principles of ESB Integration

The basic principles of ESB integration are:

  • Transportation: It negotiates between different formats like JDBC, HTTP, JMS, etc.
  • Transformation: It deals with the transportation of data between data formats needed by the ESP connector.
  • Non-functional consistency: It is the way of how monitoring and security policies are applied and should be consistent.

Mediation: It involves offering different interfaces to:

  • Enables different channels to the same component implementation.
  • Support various service versions for backward compatibility.

7) What is Mule Expression Language?

MEL or Mule Expression Language is a light-weight mule specific language that can be used to access and evaluate data in the payload.

8) List various types of endpoints in Mule ESB

Various types of Endpoints in Mule are 1) JMS, 2) HTTP, 3) SMTP, 4) IMAP, and 5) AJAX.

9) What is the full form of SDO?

The full form of SDO is a Service Data Object.

10) Mention different types of Exception Handling

Different types of exception handlings are:

  • Rollback exception handling.
  • Default exception handling.
  • Catch exception handling.
  • Global exception handling.
  • Choice exception handling.

11) What are the advantages of using ESB?

The advantages of using ESB are:

  • It offers a high level of the operational controlling facility from the portal that is based on the web.
  • ESB provides numerous connectivity options using SaaS-based applications.
  • It provides API and analytics management.
  • ESB is equipped with numerous bug fixing and automated testing facilities.
  • EDI (Electronic Data Interchange)/B2B (business to business) integration.
  • Batch integration feature using real-time integration methods

12) What is a transient context?

Transient context is used to pass the values within the existing flow, either requesting flow or the responding flow.

13) What is Mule Transformer?

Mule transformer is an event instance that refers to a library, org.mule.api.MuleEvent. This object carries the message with the event. The main aim of the Mule transformer is to create a chain of transformers.

14) What is API?

API is the acronym for Application Programming Interface. It is a software interface that allows two applications to interact with each other without any user intervention.

APIs provides product or service to communicate with other products and services without having to know how they’re implemented.