Mulesoft Interview Questions and Answers

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Mulesoft interview Questions and answers for all the freshers and intermediate candidates to crack your interview.

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.

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:
    1. Enables different channels to the same component implementation.
    2. Support various service versions for backward compatibility.
Mulesoft Interview Questions

What is the benefit of using Mule ESB?

Mule ESB is an integration framework that is lightweight and highly scalable. It enables developers in starting small applications and also in connecting different applications. With Mule managing the exchanges between components and applications transparently and ESB taking care of a variety of applications, it is easy to integrate third-party applications with the help of Mule.

Mulesoft Interview Questions and Answers

What are the various types of Exception Handling?

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

What are the characteristics of Mule ESB?

An ESB is used for the purpose of integration with an approach that is service-oriented. Its features include:

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

In Mule, how do you develop and consume SOAP services?

SOAP services can be created just like how we create a Mule project by using RAML. The difference here is that we need Concert WSDL importing rather than RAML. And SOAP services can be consumed by using our Mule flow CXF component or Web Service Consumer.

How can you find out whether your project requires ESB?

As every project might not require an ESB, you should analyze first to see if your project might benefit from ESB implementation. Certain things that should be at the front of your mind while you analyze the need for ESB are:

  • If the project requires integration of more than 3 applications or services and if communication between two application is needed, it would be enough to use point to point integration
  • Sometimes there will be a need for you to scale the project in the future where there might arise a need to interact with multiple services. This is required only by a few projects that perform heavy tasks
  • If the project requires message routing abilities such as aggregating and forking message flows. This feature is not necessary for all projects
  • You should have clarity on the architecture of the thing that needs to be achieved. A simple POC integration of small parts to find out the benefits is much better
  • As most of the ESBs are on the expensive side, first evaluate whether your project budget permits ESB use

Other related Interview Questions and Answers:

Name the various kinds of Primitives that are used in Mediation.

The following are the various kinds of primitives in mediation

  • Endpoint Lookup
  • Service Invoke
  • DB lookup
  • Data Handler
  • Type Filter
  • Message Element Setter
  • Custom MediationFan-out
  • Fan-in
  • Header Setters
  • Message Logger
  • Even Emitter
  • XSLT
  • BO MapMessage Filter
  • Fail
  • Stop
  • Sub Flow

Mulesoft Interview Questions for Freshers

Name the various ESBs that are in the market

There are different ESBs in the market, both licensed and open source. They are:

  • JBoss Fuse ESB
  • Mule ESB
  • Talend

What do you know about Mule’s shared resources?

Connectors can be made into reusable components. For that, you first need to define them as common resources and then expose them to all applications that have been deployed under the same domain. Such resources are called shared resources. Shared resources need to be defined inside Mule Domain Project and need to be referred to every one of the projects that are intended to incorporate the elements in it.

How to select an ESB?

Usability: How complicated is the installation process? The learning curve of the ESB should not belong.

Maintainability: How to monitor the product? If any GUI terminal is available for monitoring the services.

Community: Is there an active community for the ESB. Various discussion forums, tutorials, etc. Enterprise Support- Is the product support reliable. What services are available.

Flexibility: Can the ESB be configured to meet the business requirements.

Reliability: The reliability of the ESB. Its current users and various case studies if available.

Cost: The cost of the ESB. Its Licence policies. Support costs. etc.

Crack your interview with these Mulesoft Interview Questions:

What does the statement “Any Point Platform” means to Mule Soft?

MuleSoft is a secure, robust, and highly scalable communication network that allows the application to do self-services, it helps organizations to integrate applications, data, and multiple devices in a flexible environment.

It is a hybrid application integration platform that includes ESB, unified solutions for APIs management, iPaaS, application design, and publishing. 

MuleSoft allows using N number of software and tools which includes the below list 

  • API Designer- Any Time Design Center
  • Any Point Studio- Any Point Design Center 
  • API Manager-Any Point Management Center
  • API Analytics-Any Point Management Center 
  • API Portal-Any Time Exchange 
  • MCQs- Runtime Services 
  • Mule ESB-Mule Runtime Engine 
  • Any point Connectors 
  • CloudHub- Hybrid Cloud 
  • Mule Enterprise Management 

What are the advantages of using an ESB?

  • High level of operational control from the central web-based portal. 
  • Wide range of connectivity through more than 120 leading SaaS-based applications on-premises.
  • Ensuring zero message loss reliability and gives you high availability. 
  • Custom code out of data mapping with graphical integration and transformation 
  • Analytics and API Management 
  • Equipped with thousands of automated tests and bug fixing techniques.
  • EDI/B2B Integration 
  • Batch Integration with Real-Time Integration techniques 
  • Premium connectors for HL7, Oracle, Epic, and SAP. 

What is Transient Context?

Transient Context is used to pass the required values within the existing flow either the requesting flow or the responding flow. The transient flow could not make it link requests or responses together, so it is not used across.

It is not being used if you want to save an input message before service gets invoked into the request or response flow.

Transient is made to act as temporary storage of messages in general after the service invokes a call, the next primitive creates another message by combining the two, first the invoked response and second the original message that is stored in the Transient Context.  

What Is Service Layer In Mule ?

A Mule service is composed of all the Mule entities involved in processing particular requests in predefined manners.A service is defined by a specific configuration. This configuration determines the different elements, from the different layers of responsibility, that will be mobilized to process the requests that it will be open to receive. Depending on the type of input channel it uses, a service may or may not be publicly accessible outside of the ESB.

What Is Transport Layer In Mule ?

The transport layer is in charge of receiving or sending messages. This is why it is involved with both inbound and outbound communications. A transport manifests itself in the configuration by the following elements: connectors, endpoints and transformers.

A transport also defines one message adapter. A message adapter is responsible for extracting all the information available in a particular request (data, meta information, attachments, and so on) and storing them in transport-agnostic fashion in a Mule message. 

What Is Filter In Mule ?

Filters are a powerful complement to the routers. Filters provide the brains routers need to make smart decisions about what to do with messages in transit. Some filters go as far as deeply analyzing the content of a message for a particular value on which their outcome will be based.

How Message In Mule Is Composed ?

A Mule message is composed of different parts: The payload, which is the main data content carried by the message.

The properties, which contain the meta information much like the header of a SOAP envelope or the properties of a JMS message. Optionally, multiple named attachments, to support the notion of multipart messages.

Optionally, an exception payload, which holds any error that occurred during the processing of the event.

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