Salesforce-MuleSoft-Developer Practice Test Questions

Explanation:

vars: Keyword for accessing a variable, for example, through a DataWeave expression in a Mule component, such as the Logger, or from an Input or Output parameter of an operation. If the name of your variable is myVar, you can access it like this: vars.myVar Hence correct answer is Account Type: #[vars.accountType]

Explanation:

Correct answer is Publish the API to Anypoint Exchange Anypoint Exchange makes this possible by making it discoverable in below ways
1) In private exchange for internal developers
2) In a public portal for external developers/clients

Explanation:

The On Table Row Database listener in MuleSoft is designed to poll a database table for new records. To ensure it retrieves only new rows (and does not repeat the same ones), you must configure a "watermark column". This is a column with values that increase over time, such as a timestamp or a numeric ID. In this case, record_id is an increasing numeric column, making it ideal for a watermark.

When you set the watermark column to record_id, the listener will track the last retrieved value and, on the next poll, will only select rows where record_id is greater than that value. This prevents duplicate processing of previously retrieved records and ensures that each new row is only picked up once. This is the most effective and scalable way to track progress in polling operations.

While you can use an Object Store (Option B) to manually manage state, the watermark feature is built-in and more appropriate for this use case. The target setting (mentioned in Options A and C) is used to store query results, not to track which records have already been retrieved — so those are incorrect.

Incorrect Options:

A. Set the target to store the last record_id – target stores data, not progress tracking.
B. Set the ObjectStore to store last record_id – Possible, but unnecessary; watermark is built-in.
C. Set the target to the record_id column – Misuses target; it doesn’t control polling behavior.

Explanation:

In Mule 4, variables are accessed via the vars scope. The correct syntax to retrieve the booklSBN variable is:

vars.booklSBN

Why Other Options Are Wrong:

A (booklSBN): Missing scope prefix (vars).
B (attributes.booklSBN): attributes stores metadata (e.g., query params), not flow variables.
C (flowVars.booklSBN): Mule 3 syntax (deprecated in Mule 4).

Explanation:

According to the RAML specification at the top of the image, the POST /users endpoint expects:

Two headers: username and password, both as strings.
Request body: with content type application/json.

Option B correctly sets:

POST method to http://localhost:8081/api/users

Adds headers:

Content-Type: application/json

username: max

password: mule

This aligns precisely with the requirements defined in the RAML. It passes the credentials as headers and indicates the correct content type for the JSON payload (even if the payload is not shown, it's correctly structured to be accepted).

Incorrect Options:

A. Option A – Only sets Content-Type; missing username and password headers.
C. Option C – Incorrectly passes username and password as query parameters instead of headers.
D. Option D – Uses malformed header values (username.max and password.mule); also mixes query params with headers improperly.

Explanation:
Correct answer is APP: API RESOURCE NOT FOUND
1) A web client submits the request to the HTTP Listener.
2) The HTTP Request throws an "HTTP:NOT_FOUND" error, execution halts.
3) The On Error Propagate error Handler handles the error. In this case
,HTTP:NOT_FOUND error is mapped to custom error APP:API_RESOURCE_NOT_FOUND. This error processor sets payload to APP:API_RESOURCE_NOT_FOUND.
4) “APP:API_RESOURCE_NOT_FOUND. ” is the error message returned to the requestor in the body of the HTTP request with HTTP Status Code: 500

Explanation:

In MuleSoft, to apply a default global error handler across all flows, you must define the error handler globally and reference it at the application level. This is done using the defaultErrorHandler attribute inside the tag in the Mule configuration XML file (e.g., my-app.xml). This makes the error handler reusable and ensures all flows inherit it unless they define their own error handling.

This declaration tells MuleSoft to apply the global-error-handler (as defined in the scope) as the default error handler for all flows that do not explicitly specify one. This approach aligns with best practices and keeps error handling consistent and centralized.

Incorrect Options:

A. mule-artifact.json – Manages deployment and app metadata, not flow behavior.
B. Validation folder – Not related to error handling configuration.
C. pom.xml – Used for dependency and build configuration, not error handling setup.

Explanation:

• In a Choice router you write a DataWeave boolean expression that returns true when you want to take the non-default branch.
• Here you need to compare the incoming event’s payload.company field to the literal "MuleSoft".
• The syntax is #[ 'MuleSoft' == payload.company ]—first string, then the equality operator, then the field reference.

Why the others don’t work:

• B (#[ company = "MuleSoft" ]) uses a single equals (assignment), not a comparison, and omits payload.
• C and D wrap things in if(…) unnecessarily and D even has a typo ('MuleSoff). So option A is the only valid boolean expression to route to your non-default flow.

Explanation:

Correct answer is Request access to the API in Anypoint Exchange. This way we can get clientId and Client secret which we can use to access the API.

Explanation:

The correct answer is To avoid duplicate processing of records in a database.
If a watermark column is provided, the values taken from that column are used to filter the contents of the next poll, so that only rows with a greater watermark value are returned. If an ID column is provided, this component automatically verifies that the same row is not picked twice by concurrent polls.