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Table of contents
1.
Introduction
2.
Mulesoft Interview Questions for Freshers
2.1.
1. Explain Mulesoft.
2.2.
2. Mention the types of variables in Mule.
2.3.
3. Explain the types of messages used in Mulesoft?
2.4.
4. Mention some features of Mule ESB.
2.5.
5. Define shared resources in Mule.
2.6.
6. What do you understand by Mule expression language?
2.7.
7. What are the different types of endpoints in Mule ESB? 
2.8.
9. What is SDO?
2.9.
10. Mention the advantages of using an ESB. 
2.10.
11. Define listener in Mulesoft.
2.11.
12. What do you mean by environment variables?
2.12.
13. Explain error handling in Mulesoft.
2.13.
14. Name the different primitives used in Mediation.
2.14.
15. What is meant by fan-in and fan-out?
2.15.
16. Briefly explain scatter-gather.
2.16.
17. Briefly explain Mule Runtime.
2.17.
18. Name the different exception handling in Mulesoft.
2.18.
19. What do you understand by a worker in Mulesoft?
2.19.
20. Enlist some features of API in Mulesoft.
3.
Mulesoft Interview Questions for Experienced
3.1.
21. Differentiate between Service Invoke and Callout in Mulesoft.
3.2.
22. What do you understand by the payload in Mulesoft?
3.3.
23. Name some of the different flow processing strategies in Mulesoft.
3.4.
24. What features should be considered before selecting an ESB?
3.5.
25. How can you achieve reliability in Mulesoft?
3.6.
26. What is the application of Outbound Endpoint in Mulesoft?
3.7.
27. What do you understand by web services? 
3.8.
28. Define database connector.
3.9.
29. Explain the application of RAML.
3.10.
30. What do you understand by dwl files?
3.11.
31. What are the different parts of a composed message in Mule?
3.12.
32. Briefly explain the functionality in the transport layer in Mulesoft.
3.13.
33. What do you understand by polling frequency in a file connector in Mulesoft?
3.14.
34. Compare SOAP and REST.
3.15.
35. What are the parameters needed while configuring a scheduler?
3.16.
36. Define Multicasting Router in Mule.
3.17.
37. What do you understand by MUnits in Mulesoft?
4.
Frequently Asked Questions
4.1.
How do I prepare for a MuleSoft developer interview?
4.2.
What are the basics to learn MuleSoft?
4.3.
How many types of variables are there in MuleSoft?
4.4.
What are the 3 APIs in MuleSoft?
4.5.
Why use MuleSoft API?
5.
Conclusion 
Last Updated: Jun 12, 2024
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Mulesoft Interview Questions

Author Nikunj Goel
1 upvote
Create a resume that lands you SDE interviews at MAANG
Speaker
Anubhav Sinha
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12 Jun, 2024 @ 01:30 PM

Introduction

Mulesoft provides application software for connecting data and devices. Mulesoft reduces the complexity of dealing with multiple systems. The numerous tools in Mulesoft's platform help the developers to manage and test APIs. With this technology growing very well in the IT industry, it becomes crucial to have some important Mulesoft questions handy to prepare beforehand for your Mulesoft interviews. In this blog, we will discuss some important Mulesoft interview questions.

Mulesoft interview questions

Mulesoft Interview Questions for Freshers

The questions in this section would build your foundational knowledge of Mulesoft. It is critical to go through these questions as they cover the basics of the topic.

1. Explain Mulesoft.

Ans: Mulesoft provides an open-source platform to reduce the complexity of handling multiple systems while developing applications. It is a java-based ESB framework used to connect data and devices. It helps engineers with issues like Error handling, data structure, design, Monitoring, etc., while making their work more efficient and scalable. Mulesoft is also used to connect Saas software to the cloud.

2. Mention the types of variables in Mule.

Ans: Mule offers three different types of variables to its developers:

1. Record variables: These are the particular type of Mulesoft variables that come into application within batch processing flows. 

Syntax:

#[recordVars.Code]

 

2. Session variables: Session variables are used to set or delete variables combined with a piece of specific information throughout the entire process.

Syntax

#[sessionVars.Code]  

 

3. Flow variables: These variables are used to store messages within the current flow. 

Syntax:

#[flowVars.Code]

3. Explain the types of messages used in Mulesoft?

Ans: The different types of messages used in Mulesoft are:

  • Bridge messages: Messages that are directed from inbound to outbound routers are called Bridge messages
     
  • Build messages: Messages that are generated from dynamic/fixed values are called build messages
     
  • Echo and log messages: These messages are to log data and advance them from inbound to outbound routers. 

4. Mention some features of Mule ESB.

Ans: Mule ESB or Mule Enterprise Service Bus reduces the complexity of developers connecting and interchange data. To put it in simpler words, it is easier to interact with applications running on different VMs.

Features of Mule ESB include:

  • Message Routing Service
     
  • Web Service Security
     
  • Graph design with a simple drag-and-drop feature
     
  • Message transformation feature
     
  • Collection of service containers
     
  • Centralized Monitoring, etc

5. Define shared resources in Mule.

Ans: It is the feature by which multiple developers from different teams can work on the same application parallelly. Thus the shared resource is open to numerous software applications deployed under the same domain. Shared resources make it easier to support various clients and service lines simultaneously.

6. What do you understand by Mule expression language?

Ans: Mule Expression Language or MEL is a Mule language used to retrieve and check data in the payload. It is also used to access properties and attributes of a message in Mule.

7. What are the different types of endpoints in Mule ESB? 

Ans: Endpoints are triggers that initiate the processing in the workflow of Mule. Following are the different endpoints in Mule ESB are:

  1. IMAP: Internet Messaging Access Protocol
     
  2. SMTP: Simple Mail Transfer Protocol
     
  3. JMS: Java Message Service
     
  4. AJAX: Asynchronous Javascript and XML
     
  5. HTTP: Hypertext Transfer Protocol
     
  6. VM: Virtual Machine
     
  7. JDBC: Java Database Connectivity
     
  8. FTP: File Transfer Protocol

9. What is SDO?

Ans: The full form of SDO is Service Data Object. It refers to the objects in Mulesoft. SDO acts as an abstraction layer hiding the protocols and transports, thus reducing the complexity for the user. 

10. Mention the advantages of using an ESB. 

Ans: The advantages of using an ESB are:

  1. With the help of Saas-based applications, ESB offers numerous connectivity options.
     
  2. ESB grants services for the management of API and analytics.
     
  3. ESB comes with the feature of automated bug fixing and testing services.
     
  4. ESP is a faster and more flexible approach to batch integration with the help of real-time integration property.

11. Define listener in Mulesoft.

Ans. In Mulesoft, a listener is referred to as an inbound connector that is used for listening to incoming messages. It can be described as a configuration element that states the protocol, port, and other settings for receiving messages from an external system. After the listener receives the message, it is then transmitted to the next component in the mule flow for processing.

12. What do you mean by environment variables?

Ans. Environment variables are used to keep the configurations and credentials secure and flexible in Mulesoft. They can be used in Mulesoft with syntax ${env:}. In the Mulesoft environment, variables can be defined using the YAML  file or the Anypoint Runtime Manager.

13. Explain error handling in Mulesoft.

Ans. Mulesoft provides numerous ways to manage errors while executing mule applications. With the error handling feature in Mulesoft, a robust and reliable application can be developed. 

Click on the following link to read further: Javascript Interview Questions and Answers

14. Name the different primitives used in Mediation.

Ans: Mediation customizes the communication between the application software and service elements. The different types of primitives used in Mediation are: 

  • Type Filter
     
  • Service Invoke
     
  • Fan-in
     
  • Fan-out
     
  • Message Filter
     
  • XSLT
     
  • BO Map
     
  • Even emitter
     
  • Stop
     
  • Message element setter
     
  • Fail
     
  • Sub Flow
     
  • Headers, Setters, etc

15. What is meant by fan-in and fan-out?

Ans: Fan-in refers to the number of inputs managed by any logic gate. For example, if an AND gate has four inputs, the fan-in would be 4.

Fan-out is a primitive mediation that denotes the process where a service router sends messages parallel to numerous consumers.

Fan-in and Fan-out are always used together.

16. Briefly explain scatter-gather.

Ans. In Mulesoft, the Scatter-gather component is a powerful message-processing router that permits a mule flow to send a single message to numerous endpoints, collecting the responses simultaneously. It works by dividing the message into numerous copies. Thus the complexity of message processing is reduced, thereby increasing the performance of mule flows.

17. Briefly explain Mule Runtime.

Ans: Mule Runtime is basically a runtime engine like an application server for hosting and running mule software applications. Mule runtime can be configured in the cloud. Mule runtime engine offers a single runtime feature, deployment flexibility, and adaptable architecture.

18. Name the different exception handling in Mulesoft.

Ans: The different types of exception handling in Mulesoft are:

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

19. What do you understand by a worker in Mulesoft?

Ans: Workers in Mulesoft refer to committed instances that are configured on AWS to run integration software applications. Workers in Mulesoft have certain properties associated with them. They are:

  • Isolation: Workers must run on different containers
     
  • Capacity: Capacity is necessary for data processing
     
  • Locality: All workers in Mulesoft should be hosted on the cloud
     
  • Manageability: Each worker should be deployed and managed separately

20. Enlist some features of API in Mulesoft.

Ans: The features of API are:

  • API complies with HTTP standards
     
  • APIs are more secure
     
  • Sharing data is easier
     
  • APIs improve customer experience
     
  • There is a software development life process associated with every API.
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Mulesoft Interview Questions for Experienced

This section comprises hard-level questions that would make you confident enough to sit for your Mulesoft interviews and crack them with flying colors.

21. Differentiate between Service Invoke and Callout in Mulesoft.

Ans: While developing a service for either request flow or response flow, service invoke is the beginning step of the process. Service invoke can be used to call internal functions and mule components like connectors, routers, transformers, etc., whereas the callout method is responsible for receiving messages. Simultaneously in a flow, they request the required operation. The callout can be used to perform HTTP POST, GET, PUT, and DELETE operations. Thus it can be said that callout can be used to call external services.

22. What do you understand by the payload in Mulesoft?

Ans: The mule payload is a fundamental concept in Mulesoft. The mule payload is a runtime attribute used to store objects and arrays. It can be text, JSON, binary data, or any other data format, depending on the nature of the application used. A mule payload is wrapped within Mule.api. The payload usually contains business-related data transferred from the source to the destination via Mulesoft. The information in the payload is encrypted as it travels. The Mule processors like transformers, routers, and filters are responsible for transforming it. The payload can also be stored in a dwl filefrom where it can be used anywhere else in a flow as well.

23. Name some of the different flow processing strategies in Mulesoft.

Ans: The flow processing strategies in Mulesoft determine the way Mule performs the processing of messages. Following are the different flow processing strategies in Mulesoft: 

  • Asynchronous processing
     
  • Synchronous processing
     
  • Custom Processing
     
  • Queued Processing
     
  • Queued Asynchronous processing
     
  • Non-blocking
     
  • Thread per processor

24. What features should be considered before selecting an ESB?

Ans: The following attributes should be considered while selecting an ESB:

  • Serviceability: The installation process should not be too complicated.
     
  • Cost: The budget and the support costs should be considered. The license policies should be reviewed.
     
  • Maintainability: The GUI terminal should be available for monitoring the services.
     
  • Reliability: The reliability of the ESB should also be considered by checking its current and past users.
     
  • Flexibility: The selected ESB should be appropriate as per the business needs. 

25. How can you achieve reliability in Mulesoft?

Ans: Reliability in Mulesoft refers that there should be no loss in a message. Hence to achieve reliability, the status of the running instance is to be captured. Configuring transactional support on a JMS listener or Virtual Machine ensures built-in support that gives reliable messaging.

26. What is the application of Outbound Endpoint in Mulesoft?

Ans: Outbound Endpoint refers to passing data from the mule application to outside. Outbound Endpoint is used:

  • In writing file stream
     
  • For sending SOAP messages
     
  • For sending emails

27. What do you understand by web services? 

Ans: Web services in Mulesoft are a function in any language that can be accessed over HTTP. Every web service has a client-service relationship. 

Web services can be either asynchronous or synchronous.

28. Define database connector.

Ans. Through a database connector, we can integrate different types of databases like Oracle, MySQL, MongoDB, etc., and perform create, delete, update, and read operations on the databases. Thus the task of performing complex transformation becomes easier.

29. Explain the application of RAML.

Ans: RAML, also known as RESTful API Modelling Language, is used to design, deploy and share API life processes. It is used to express the details required to explain RESTful APIs. Thus it permits developers to define the structure and functionality of an API in a clear and concise manner which in turn speeds up the development process. It can be used to define the methods, datatypes, parameters, resources, validation rules, and other security requirements on an API. Basically, RAML is used to configure field-level changes and is designed on software known as the Anypoint platform.

30. What do you understand by dwl files?

Ans. DWL, that is, data transformation language, is used in mule flows to transform data. To write a DWL file in Mule, you should follow the steps given below:

  1. Navigate to New->file->Project_name
     
  2. Goto src/main/resources/module
     
  3. Add the dwl file

31. What are the different parts of a composed message in Mule?

Ans: The different parts of a Mule message are the message header and message payload.

The message header contains the message's metadata, and the message payload contains crucial data related to business.

32. Briefly explain the functionality in the transport layer in Mulesoft.

Ans: The transport layer is necessary for Mulesoft to send and receive messages via outbound and inbound interactions. The transport layer gets aligned to the connectors and transformers.

33. What do you understand by polling frequency in a file connector in Mulesoft?

Ans: Polling frequency refers to the value of the poll. The polling frequency has to be decreased to milliseconds to capture/poll the direction of the inbound endpoints of a new file so that you can read the current content.

34. Compare SOAP and REST.

Ans: 

SOAP

REST

SOAP stands for Simple Object Access ProtocolRepresentational State Transfer
It uses XML as its message formatREST uses JSON as well as XML.
SOAP is considered more complex as it uses XMLREST is comapatively simpler as it uses HTTP methods.
There is a built-in error handling feature available in SOAP.Built-in error handling feature is absent in REST.
It is a specific protocol that is used to execute the RPC (Remote procedure call) functionality. A client sends a request to the server and expects a response.Rest is based on an ROA (Resource Oriented Architecture). Here the resources are recognised as URLs and manipulated using HTTP methods like GET, PUT, POST, DELETE to perform tthe required operations.

35. What are the parameters needed while configuring a scheduler?

Ans: The parameters needed in the configuration of a scheduler are:

  • Start Delay: After configuring the scheduler, the start delay is known as how much prior the task is to be started.
     
  • Time Unit: It states the unit of time.
     
  • Frequency: Number of times the developer wants to do the work.

36. Define Multicasting Router in Mule.

Ans: Multicasting routers deliver messages over different transport to more than one terminal. Thus the message is distributed to numerous recipients simultaneously. A Multicasting Router comes into the application when there are multiple transports waiting at the endpoint list.

37. What do you understand by MUnits in Mulesoft?

Ans. MUnit is a testing framework in Mulesoft that is used to test flows, connectors, and transformers. It also generates a report on the results. MUnits are created using XML files. MUnits ensure that the mule application is running without any errors. The features provided by MUnits include the following:

  • Mocking of external systems and services
     
  • Debugging of test cases
     
  • Data-driven testing

Frequently Asked Questions

How do I prepare for a MuleSoft developer interview?

Review MuleSoft's basic concepts, including as integration patterns, flows, connectors, and message processors, to prepare for a MuleSoft developer interview. Learn about the components of the Anypoint Platform and how to design, develop, and deploy Mule applications.

What are the basics to learn MuleSoft?

Begin learning MuleSoft by grasping integration and API basics. Discover the various sorts of integration patterns, data formats, protocols, and RESTful APIs. Learn about endpoints, connectors, flows, transformers, and message processors, which serve as the foundation for MuleSoft applications.

How many types of variables are there in MuleSoft?

MuleSoft has three main variable types: Flow variable: Sets or removes variables associated with a message in the current flow. Record variable: A special variable used solely within Batch Jobs. Session variables: Sets or removes variables associated with a message during the lifecycle.

What are the 3 APIs in MuleSoft?

MuleSoft's API-driven approach implies that three basic sorts of APIs should be built. System APIs for the system of record integration, Process APIs for ESB orchestration, and Experience APIs for each consuming client.

Why use MuleSoft API?

MuleSoft simplifies data unification to provide single customer view, and create connected experiences. A modern API-based approach turns every integration into a reusable building block.

Conclusion 

Now that you have gone through the above Mulesoft interview questions, you are closer to your dream job at your dream company. The questions would also help you practice for your viva. Thank you for going through the Mulesoft interview questions.

We believe the article was helpful for all the freshers preparing for their Mulesoft interviews. Keep up the learning progress. You can also dive into the links below and increase your knowledge.

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