MULESOFT OR MULE ESB INTERVIEW QUESTIONS

MULESOFT OR MULE ESB INTERVIEW QUESTIONS Here are the 18 most important and common mulesoft or mule esb interview questions and answers which are bound to be asked in any Mule ESB interview. Whether it’s Mulesoft or Mule ESB interview with Accenture, Cognizant, Infosys, Deloitte or any company below Mule ESB interview questions are always always been asked. You can easily clear any Mulesoft or Mule ESB interview questions if you learn answers to these Mule ESB questions.

1. What are Web Services? Web service is a function or program in any language that can be accessed over HTTP. Message format can be XML or JSON or any other program as long as the other programs can understand and communicate. Web services can be synchronous or asynchronous. Any web service has server-client relationship. Any web service can have multiple clients. Eg: When a travel portal is selling tickets of an airliner, Portal is client and the Airline is the server as it is selling its service.

3. What is REST? REST stands for Representaional State Transfer or RESTful web service. REST is a client-server architecture which means each unique URL is representation of some object or resource. Any REST API developed uses HTTP methods explicitly and in a way that’s consistent with the protocol definition. This basic REST design principle establishes a one-to-one mapping between create, read, update, and delete (CRUD) operations and HTTP methods. According to this mapping: To create a resource on the server, use POST. To retrieve a resource, use GET. To change the state of a resource or to update it, use PUT. To remove or delete a resource, use DELETE. Example: If we want to create a REST service that fetchs the record of a customer then our URI will be: – GET http://tutorialsAtoZ.com/customer/{customerID} where HTTP method is GET, Resource is customer And URI parameter is customerID which dipicts for which resource we want to fetch the records.

4. What’s the difference between SOAP and REST? REST is almost always going to be faster. The main advantage of SOAP is that it provides a mechanism for services to describe themselves to clients, and to advertise their existence. REST is much more lightweight and can be implemented using almost any tool, leading to lower bandwidth and shorter learning curve. However, the clients have to know what to send and what to expect. In general, When you’re publishing an API to the outside world that is either complex or likely to change, SOAP will be more useful. Other than that, REST is usually the better option.

6. What is RAML and why we use it? RAML – RESTful API Modeling LanguageRAML is similar to WSDL, it contains endpoint URL, request/response schema, HTTP methods and query and URI parameter. RAML helps client (a consumer of the service) know, what the service is and what/how all operations can be invoked. RAML helps the developer in creating the initial structure of this API. RAML can also be used for documentation purpose.

7. What are the different types of flow Subflow – A subflow is always synchronous. It is similar to a synchronous flow, subflow executes in the same thread of the calling process. Calling process triggers the sub-flow and waits for it to complete and resumes once the sub-flow has completed. Synchronous Flow– Same as sub-flow, the only difference is that in synchronous flows you need to separately define an exception strategy to it, it does not inherit the exception strategy of its calling flow. Asynchronous Flow – As in sub-flow and synchronous flow, calling process triggers the sub-flow and waits for it to complete; for asynchronous flow the flow, calling process triggers an asynchronous flow and moves ahead to its next activity. An asynchronous flow executes in parallel to its calling/parent flow in a different thread. An asynchronous flow does not return its output it its parent/calling flow. Private Flow – flow that does not have an inbound connector in the source. Means a private flow cannot start of its own on receiving the inbound message as it does not have any inbound connector, A private flow can only be called using flow-ref same as sub-flow.

8. What are the different types of variables in mule? Flow Variable Session Variable Record Variable

9. Various types of Exception Handling? Default Exception Handling Global Exception Handling Catch Exception Handling Choice Exception Handling Rollback Exception Handling

10. What are Flow Processing Strategies? Synchronous Flow Processing Strategy Queued Flow Processing Strategy Asynchronous Flow Processing Strategy Thread Per Processing Strategy Queued Asynchronous Flow Processing Strategy Non-blocking Flow Processing Strategy Custom Processing Strategy

11. What are the different ways to connect a database with Mule DB connector? Read from here Mule Tutorial: Connecting with Database

12. What all storage type can be configured in Mule Cache Scope? Read from here Mule Tutorial – Caching In Mule | Cache Scope

13. How can we create and consume SOAP service in Mule? Creating SOAP Service – We can create a SOAP service same as we create Mule Project With RAML, the only change is instead of RAML we need to import Concert WSDL. Consuming SOAP Service – We can use Web Service Consumer or CXF component in our mule flow to access/consume SOAP service.

14. What are Shared Resources in Mule and how are they been used? We can make connectors as an reusable component by defining them as common resources and expose them to all applications deployed under a same domain, these resources are known as shared resources. These shared resource needs to be defined inside Mule Domain Project and then referred to each of the projects that are meant to use the elements in it.