Mulesoft Interview Questions

Mulesoft Interview Questions

1) What is MuleSoft?

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

2) What are the various types of messages in MuleSoft?

Various types of messages in MuleSoft are: 1) echo and log message, 2) bridge message, and 3) build message.

3) List types of variables in MuleSoft

Types of variables in MuleSoft are:

Flow Variable: It is used to either set or remove 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.

4) Explain Mule ESB.

Mule ESB is an architecture developed for programmers. They can integrate a range of applications together using the bus-like infrastructure. Mule ESB can be integrated with HTTP, web service, JMS, etc.

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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) 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.

8) What is the full form of SDO?

The full form of SDO is a Service Data Object.

9) 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.


10) 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.


11) What is a transient context?

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


12) What is a 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.


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13) What is an 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 provide a product or service to communicate with other products and services without having to know how they’re implemented.

14) What are the features of API?

Here are some essential features of API:

  • Efficiency
  • Wider reach
  • Customizable
  • Personalization
  • Data ownership
  • Easy integration with GUI
  • Time effective
  • Language-independent


15) What is the payload in MuleSoft?

The payload is a mule runtime variable that stores objects or arrays. It helps developers to access payload under different forms.


16) What are the various parts of composing a message in Mule?

Different parts of composing a message in Mule are:

Properties: it contains the header or meta-information or header similar to the SOAP (Simple Object Access Protocol) message.

Payload: It is the main data context carried by a particular message.

Multiple name attachments: It provides support for multiple messages or payload that occurs during event processing.

17) Mention flow processing strategies in MuleSoft.

MuleSoft has six types of strategy for flow processing:

  • A queued asynchronous flow processing
  • Custom flow processing
  • Tread per processing
  • Queued flow processing
  • Non-blocking flow processing
  • Synchronous flow processing
  • Asynchronous flow processing


18) Mention different types of primitives used in Mediation

Different types of primitives used in Mediation are:

  • Endpoint lookup
  • Data handler
  • Message element setter
  • DB lookup
  • Service Invoke
  • Type filter
  • Stop
  • Sub Flow
  • Custom mediation fan-out
  • Fan-in
  • Even emitter
  • Header setters
  • Message logger
  • XSLT
  • BO MapMessage filter
  • Fail
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19) Define the model layer in mule

The model layer is the first logical layer. It represents the runtime environment that hosts services. This layer describes the behavior of Mule when processing requests that are handled by services. It offers services with default values to simplify configuration


20) Explain connector in MuleSoft

A connector in Mule controls how a particular protocol is used. It can be configured with parameters which are specific to that protocol. The connector holds any state context which can be shared with any entity in charge of actual communications.


21) What is Endpoint in Mule?

An endpoint in MuleSoft indicates a particular usage of a protocol. It is for polling, reading from, or writing to a destination.

Therefore, it controls what underlying entities would be used with a dependent connector.


22) What Is TSD in Mule?

TSD or transport service descriptor is a connector used for technical configuration. It defines classes names used for message receivers, dispatchers, and requesters. This default value can vary to grasp the behavior of transport.


23) What are the characteristics of Global Endpoint?

Characteristics of global endpoint are:

The global endpoint is not typified or outbound routing.

It can be usable in different places of configuration files.

The global service name must be applied so that it can reference the endpoint.

It helps to clarify the usage of a particular destination.

24) Explain VM transport in MuleSoft

The VM (Virtual Machine) transport is a special type of transport that can be used to send a message via memory. These messages never leave the Java Virtual Machine, and the Mule instance is running in.


25) What is RAML?

The full form of RAML is the RESTful API Modeling Language. It is a YAML-based language that describes RESTful APIs.

RAML is best for the information needed to describe RESTful APIs. It is similar to WSDL (Web Services Description Language).

RAML contains request/response schema, URI parameter, endpoint URL, HTTP methods, and query.


26) List various the categories of Mule Processors

Categories of Mule Processors are: 1) Components, 2) Exception strategies, 3) Business events, 4) Routers, 5) Connectors, and 6) Transformers.

27) Explain the parameters to configure a scheduler

Parameters related to configuring a scheduler are:

Frequency: It is a frequency used by Scheduler to triggers flows.

Start Delay: It is the time to wait before triggering any flow.

Time Unit: The time unit for frequency and Start Delay.


28) What is a Scatter-Gather Router?

Scatter-Gather Router is the most used routing event processor. It can send a request message to more than one target concurrently. This router then collects responses from all routes and aggregate back into one response.

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29) What are the error types in MuleSoft?

Following are the effort types:

  • Transformation
  • Expression
  • Routing
  • Duplicate_Message
  • Source_Response
  • Timeout
  • Security
  • Connectivity
  • Validation

30) What are the advantages of SOAP?

The advantages of SOAP are:

SOAP is the perfect medium that is developed for web service to talk with client applications.

SOAP is a light-weight protocol which can be used for data interchange between applications.

SOAP protocol can work any programming language based applications on Windows and Linux platforms.

It does not require customization to run the web services built on the SOAP protocol to work on the WWW.

31) Explain the Mule data integrator.

A mule data integrator is a tool that is used for mapping data by visualizing it. It offers a drag and drop feature to make a developer’s coding process easier.