13 Essential MuleSoft Interview Questions and Answers to Know

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October 10, 2022Best Practices

MuleSoft Interview Questions and Answers

Q: What  was MuleSoft originally designed to do?

A: MuleSoft was designed as an event-driven framework combined with a unified representation of messages, expandable with pluggable modules. These modules provide support for a wide range of transports or add extra features, such as distributed transactions, security, or management. MuleSoft was also designed as a programmatic framework offering programmers the means to graft additional behavior such as specific message processing or custom data transformation.

Q: What’s in a name? Why the name MuleSoft?

A: There is a lot of infrastructure work to be done before ESB users can implement any logic. So this infrastructure work is regarded as “donkey work” as it needs doing for every project. A Mule is also commonly referred to as a carrier of load, moving it from one place to another.

Q: What is the difference between MuleSoft and other commercial ESB tools?

A: MuleSoft’s main differentiator is its prescriptive deployment model. Others include a prescriptive SOA methodology, a broad integration focus, strict full-stack web service orientation, and comprehensive documentation.

Q: What is a Model Layer in MuleSoft?

A: The first logical layer is the model layer. A Mule model represents the runtime environment that hosts services. It defines the behavior of Mule when processing requests handled by services. The model provides services with supporting features, such as exception strategies. It also provides services with default values that simplify their configuration.

Q: What is a Service Layer in MuleSoft?

A: A Service Layer is composed of all the MuleSoft entities involved in processing particular requests in predefined a manner. 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 receiving. Depending on the type of input channel it uses, a service may or may not be publicly accessible outside of the ESB.

Q: What is a Transport Layer in MuleSoft?

A: 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.

Q: What is a Transformer in MuleSoft?

A: A Transformer takes care of translating the content of a message from one form to another. It is possible to chain transformers to cumulate their effects. Transformers can kick in at different stages while a message transits through a service.

Q: What is a Filter in MuleSoft?

A: 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.

Q: What are Components in MuleSoft?

A: Components are the centerpiece of MuleSoft’s services. Each service is organized with a component at its core and inbound and outbound routers around it. Components are used to implement a specific behavior in a service. This behavior can be as simple as logging messages or can go as far as invoking other services. Components can also have no behavior at all; in that case, they are pass-through and make the service act as a bridge between its inbound and outbound routers.

Q: What are Configuration Builders in MuleSoft?

A: MuleSoft uses configuration builders that can translate a human-authored configuration file into the complex graph of objects that constitutes a running node of this ESB. The main builders are of two possible kinds: a spring-driven builder, which works with XML files, and a script builder, which can accept scripting language files.

Q: What is a Bridge Component in MuleSoft?

A: A Bridge Component is used to pass the messages from the inbound router to the outbound one. A bridge is a neutral component and does not perform any action or modify messages that it processes.

Q: When does MuleSoft instantiate a connector?

A: If MuleSoft figures out that one of your endpoints needs a particular connector, it will automatically instantiate one using all the default values for its different configuration parameters. This is a perfectly viable approach if you are satisfied with the behavior of the connector when it uses its default configuration.

Q: How many endpoints are there in MuleSoft, and what are they?

A: There are two endpoints for communicating between components and services: inbound and outbound endpoints. An outbound endpoint is used to do things such as send SOAP messages, write to file streams, and send email messages. A global endpoint is a destination shared by several routers.