Question # 1
Which statement is true when using XML SDK for creating custom message processors? | | A. Properties are fields defined by an end user of the XML SDK component and serve as a global configuration for the entire Mule project in which they are used | | B. An XML SDK provides both inbound and outbound operations | | C. Operations can be reused in recursive calls | | D. All operations are public |
D. All operations are public
Explanation:
When using XML SDK for creating custom message processors, all operations are public by default and can be used by any Mule application that imports them. There is no way to make an operation private or protected in XML SDK.
References: https://docs.mulesoft.com/mule-sdk/1.1/xml-sdk#operations
Question # 2
A scatter-gather router is configured with four routes:Route A, B, C and D.
Route C false. | | A. Error,errorMesage.payload.results [‘2’] | | B. Payload failures[‘2’] | | C. Error,errorMessage,payload.failures[‘2’] | | D. Payload [‘2’] |
C. Error,errorMessage,payload.failures[‘2’]
Explanation:
The result of accessing route C failure is Error,errorMessage,payload.failures[‘2’]. This is because a scatter-gather router returns an aggregated message that contains an array of results from each route and an array of failures from each route. The failures array contains error objects with information about each failed route execution. To access route C failure, which is the third route (index 2), the developer needs to use Error.errorMessage.payload.failures[‘2’] expression.
References:
https://docs.mulesoft.com/mule-runtime/4.3/scatter-gather-reference#scatter-gather-output
Question # 3
| An order processing system is composed of multiple Mule application responsible for warehouse, sales and shipping. Each application communication usingAnypoint MQ. Each message must be correlated against the original order ID for observability and tracing.
How should a developer propagate the order ID as the correlation ID across each message? | | A. Use the underlying HTTP request of Anypoint MQ to set the‘X-CORRELATION_ID’ header to the orderID | | B. Set a custom Anypoint MQ user propertyto propagate the order ID and set the correlation ID in the receiving applications. | | C. Use the default correlation ID, Anypoint MQ will sutomatically propagate it. | | D. Wrap all Anypoint MQ Publish operations within a With CorrelationID scope from the Tracing module, setting the correlation ID to the order ID |
D. Wrap all Anypoint MQ Publish operations within a With CorrelationID scope from the Tracing module, setting the correlation ID to the order ID
Question # 4
A mule application exposes and API for creating payments. An Operations team wants to ensure that the Payment API is up and running at all times in production. Which approach should be used to test that the payment API is working in production?
| | A. Create a health check endpoint that listens on a separate port and uses a separate HTTP Listener configuration from the API | | B. Configure the application to send health data to an external system | | C. Create a health check endpoint that reuses the same port number and HTTP Listener configuration as the API itself | | D. Monitor the Payment API directly sending real customer payment data |
A. Create a health check endpoint that listens on a separate port and uses a separate HTTP Listener configuration from the API
Explanation:
To test that the payment API is working in production, the developer should create a health check endpoint that listens on a separate port and uses a separate HTTP Listener configuration from the API. This way, the developer can isolate the health check endpoint from the API traffic and avoid affecting the performance or availability of the API. The health check endpoint should return a simple response that indicates the status of the API, such as OK or ERROR.
References:
https://docs.mulesoft.com/api-functional-monitoring/afm-create-monitor#create-a-monitor
Question # 5
A Mule application need to invoice an API hosted by an external system to initiate a process. The external API takes anywhere between one minute and 24 hours to compute its process.
Which implementation should be used to get response data from the external API after it completes processing? | | A. Use an HTTP Connector to invoke the API and wait for a response | | B. Use a Scheduler to check for a response every minute | | C. Use an HTTP Connector inside Async scope to invoice the API and wait for a response | | D. Expose an HTTP callback API in Mule and register it with the external system |
D. Expose an HTTP callback API in Mule and register it with the external system
Explanation:
To get response data from the external API after it completes processing, the developer should expose an HTTP callback API in Mule and register it with the external system. This way, the external API can invoke the callback API with the response data when it is ready, instead of making the Mule application wait for a long time or poll for a response repeatedly.
References:
https://docs.mulesoft.com/mule-runtime/4.3/http-listener-ref#callback
Question # 6
A Mule API receives a JSON payload and updates the target system with the payload. The developer uses JSON schemas to ensure the data is valid.
How can the data be validation before posting to the target system? | | A. Use a DataWeave 2.09 transform operation, and at the log of the DataWeave script, add:
%dw 2.0
Import.json-moduls | | B. Using the DataWeave if Else condition test the values of the payload against the examples included in the schema | | C. Apply the JSON Schema policy in API Manager and reference the correct schema in the policy configuration | | D. Add the JSON module dependency and add the validate-schema operation in the flow, configured to reference the schema |
D. Add the JSON module dependency and add the validate-schema operation in the flow, configured to reference the schema
To validate the data before posting to the target system, the developer should add the JSON module dependency and add the validate-schema operation in the flow, configured to reference the schema. The JSON module provides a validate-schema operation that validates a JSON payload against a JSON schema and throws an error if the payload is invalid.
References:
https://docs.mulesoft.com/json-module/1.1/json-validate-schema
Question # 7
Which pattern should be used to invoke multiple HTTP APIs in parallel and roll back failed requests in sequence? | | A. A database as a transactional outbox and an Until Successful router to retry any requests | | B. A Parallel for Each scope with each HTTP request wrapped in a Try scope | | C. Scatter-Gather as central Saga orchestrator for all API request with compensating actions for failing routes | | D. VM queues as a reliability pattern with error handlers to roll back any requests |
C. Scatter-Gather as central Saga orchestrator for all API request with compensating actions for failing routes
Explanation:
To invoke multiple HTTP APIs in parallel and roll back failed requests in sequence, the developer should use a Scatter-Gather router as a central Saga orchestrator for all API requests with compensating actions for failing routes. A Scatter-Gather router executes multiple routes concurrently and aggregates the results. A Saga orchestrator coordinates a series of actions across different services and handles failures by executing compensating actions. Therefore, using a Scatter-Gather router as a Saga orchestrator allows invoking multiple HTTP APIs in parallel and rolling back any failed requests in sequence.
References:
https://docs.mulesoft.com/mule-runtime/4.3/scatter-gather-concept
https://docs.mulesoft.com/mule-runtime/4.3/saga
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