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Salesforce Certified MuleSoft Developer (Mule-Dev-201) Exam Questions
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- Salesforce MuleSoft Developer I Certifications
- Topic 1: Creating Application Networks: The topic of creating Application Networks encompasses understanding MuleSoft’s proposal for closing the IT delivery gap and describing the role and characteristics of the modern API. It also includes the purpose and roles of a Center for Enablement (C4E), and the benefits of API-led.
- Topic 2: Designing APIs: Designing APIs involves describing the lifecycle of the modern API and using RAML to define various aspects of an API. It includes identifying when to use query parameters vs URI parameters, and defining API parameters.
- Topic 3: Accessing and Modifying Mule Events: It describes the Mule event data structure. Moreover, the topic focuses on usage of transformers and enriching Mule events.
- Topic 4: Structuring Mule Applications: Structuring Mule applications covers parameterizing an application and defining and reusing global configurations. It includes breaking an application into multiple flows using private flows, subflows, and the Flow Reference component.
- Topic 5: Building API Implementation Interfaces: This topic involves manually creating a RESTful interface for a Mule application and generating a REST Connector from a RAML specification. It also includes describing the features and benefits of APIkit.
- Topic 6: Using Connectors: It focuses on retrieving data from REST services using HTTP Request or REST Connector. Moreover, the topic covers using a Web Service Consumer connector for SOAP web services and the Transform Message component.
- Topic 7: Processing Records: Processing records includes methods for processing individual records in a collection and explaining how Mule events are processed by the For Each scope. It also involves using the Batch Job with Batch Steps and a Batch Aggregator.
- Topic 8: Transforming Data with DataWeave: It involves writing DataWeave scripts and using DataWeave functions. This topic also includes defining and using DataWeave variables, functions, and modules, and applying correct syntax.
- Topic 9: Routing Events: It focuses on using the Choice router for conditional logic and the Scatter-Gather router to multicast events. This topic also involves validating data by using the Validation module.
- Topic 10: Handling Errors: Handling errors includes describing default error handling in Mule applications and defining custom global default error handlers. It involves comparing On Error Continue and On Error Propagate scopes, creating error handlers for a flow, using the Try scope, and mapping errors to custom application errors.
- Topic 11: Debugging and Troubleshooting Mule Applications: Using breakpoints to inspect a Mule event during runtime, installing missing Maven dependencies, and reading and deciphering Mule log error messages are sub-topics of this topic.
- Topic 12: Deploying and Managing APIs and Integrations: It includes packaging Mule applications for deployment and deploying them to CloudHub. This topic also involves using CloudHub properties, creating and deploying API proxies, connecting an API implementation to API Manager, and applying policies to secure an API.
Free Salesforce Salesforce Certified MuleSoft Developer (Mule-Dev-201) Exam Actual Questions
Note: Premium Questions for Salesforce Certified MuleSoft Developer (Mule-Dev-201) were last updated On Mar. 03, 2026 (see below)
What is the correct syntax for a Logger component to output a message with the contents of a 3SON Object payload?
Option 3 is the only corect answer as it concatenates payload with String.
Below option wont work.
#['The payload is ' ++ payload]
Concatenation function expects both arguments to be string. As the question says payload is json object , this will throw error while running it. You can try this in Anypoint Studio and you will get the same result which I mentioned.
hence correct answer is
The payload is: #[payload]
Refer to the exhibits.
The Validation component in the private flow throws an error. What response message is returned to a client request to the main flow's HTTP Listener?
Error in validation component will get processed by Processer level On Error Propagate block and then error will be rethrown which will get processed by flow level error handler which will set payload to 'Error- main flow'. Hence correct answer is Error - main flow
1) Request is received by HTTP listener
2) Try scope gets executed
3) The validator component in the Try scope creates an Error Object because the payload is not null.
4) The On Error Propagate handles the error. The payload is set to ''Error -- Try scope''
6) ''Error -- Try scope'' is returned to the 'On Error Continue' block. Main flow execution stops. Payload is set to 'Error - main flow'
7) ''Error - main flow'' is returned to the requestor in the body of the HTTP request. HTTP Status Code: 200
------------------------------------------------------------------------------------------------------------------------------------------
Reference Diagram though not exactly same, conditions are similar. They will help you answer any new question on error handling in real exam:
https://docs.mulesoft.com/mule-runtime/4.3/on-error-scope-concept#on-error-continue
Refer to the exhibits.
What is the response when a client submits a request to http://localhost:8081?
-----------------------------------------------------------------------------------------------------------------------------------
Here's specifically what is happening here:
1) Payload is successfully set to ''Before''
2) Is null validation is used which will pass the message only if payload is null. In this case as payload is not null, it creates an Error Object. Flow execution stops
#[error.description] = ''Validation error''
3) Because no error handler is defined, the Mule default error handler handles the error
4) ''Validation error'' is the error message returned to the requestor in the body of the HTTP request with HTTP Status Code: 500
Reference diagram:
What is the correct syntax to define and call a function in Database?
A)
B)
C)
D)
Keyword to ad function in Dataweave transformation is fun. Hence option 2 and 4 are invalid. Also parameters needs to be passed exactly in same order as defined in function definition. Hence correct answer is'
fun addKV( object: Object, key: String, value: Any) =
object ++ {(key):(value)}
---
addKV ( {'hello': 'world'}, 'hola', 'mundo' )
MuleSoft Documentation Reference : https://docs.mulesoft.com/mule-runtime/4.3/dataweave-functions
DataWeave Function Definition Syntax
To define a function in DataWeave use the following syntax:
fun myFunction(param1, param2, ...) = <code to execute>
The fun keyword starts the definition of a function.
myFunction is the name you define for the function.
Function names must be valid identifiers.
(param1, param2, ... , paramn) represents the parameters that your function accepts.
You can specify from zero to any number of parameters, separated by commas (,) and enclosed in parentheses.
The = sign marks the beginning of the code block to execute when the function is called.
<code to execute> represents the actual code that you define for your function.
Refer to the exhibit.
What is the correct DataWeave expression for the Set Payload transformer to call the createCustomerObject flow with values for the first and last names of a new customer?
lookup(String, Any, Number)
This function enables you to execute a flow within a Mule app and retrieve the resulting payload.
It works in Mule apps that are running on Mule Runtime version 4.1.4 and later.
Similar to the Flow Reference component (recommended), the lookup function enables you to execute another flow within your app and to retrieve the resulting payload. It takes the flow's name and an input payload as parameters. For example, lookup('anotherFlow', payload) executes a flow named anotherFlow.
Correct answer is
lookup( 'createCustomerObject', {first: 'Aice, last: 'Green'})
MuleSoft Documentation Reference : https://docs.mulesoft.com/mule-runtime/4.3/dw-mule-functions-lookup
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