Salesforce Certified MuleSoft Developer I Practice Test Questions, Exam Dumps

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Certified MuleSoft Developer I Salesforce Practice Test Questions and Exam Dumps

Question No 1:

Refer to the exhibits. The Mule application does NOT define any global error handlers. The Validation component in the private flow throws an error.

What response message is returned to a web client request to the main flow's HTTP Listener?

A. "Parent error"
B. "Child error"
C. "Parent completed"
D. "Validation Error"

Answer: B

Explanation:

In MuleSoft, when an error occurs in a flow and no global error handler is defined, the error will propagate up the flow hierarchy. Since the Mule application does not define any global error handlers, errors thrown by components within the private flow (such as the Validation component) will propagate up to the calling flow, in this case, the main flow.

The key to understanding this scenario lies in the concept of how Mule handles errors in sub-flows and the main flow. When an error occurs in a sub-flow, it is generally referred to as a "child" error because it originates from the sub-flow that is being executed in the context of a larger "parent" flow. In this case, the Validation component throws an error within the private (child) flow, and since no global error handler is defined, the error will propagate to the parent flow.

Since the error is originating from the private flow, it will be labeled as a child error. The parent flow would capture this error, but without a defined global error handler to manage it, the response will indicate that the error came from the child (private) flow.

Thus, the correct response to the web client will be "Child error", which reflects the error's source in the private flow.

Other options are incorrect for the following reasons:

A ("Parent error") is not the correct response because the error originates from the child flow (the Validation component in the private flow), not the parent flow.
C ("Parent completed") is incorrect because the parent flow does not complete successfully due to the error thrown in the child flow.
D ("Validation Error") might seem plausible, but it's not the exact terminology used for errors originating from sub-flows. The terminology used in the error propagation would label it as a "child error," not a validation-specific message unless explicitly configured.

Therefore, the response message returned to the web client is "Child error".

Question No 2:

A function named toUpper needs to be defined that accepts a string named userName and returns the string in uppercase. What is the correct DataWeave code to define the toUpper function?

A. var toUpper(userName) = upper(userName)
B. fun toUpper(userName) = upper(userName)
C. var toUpper(userName) -> upper(userName)
D. fun toUpper(userName) -> upper(userName)

Correct Answer: B

Explanation:

In DataWeave, a function is defined using the fun keyword. The syntax to define a function in DataWeave is as follows:

Here, the fun keyword is used to declare a function. After the function name (toUpper), the parameter (userName) is provided in parentheses. The = sign is used to assign the result of the function, which in this case is upper(userName). The upper function is a built-in function in DataWeave that converts a string to uppercase.

Let's break down each option:

Option A: var toUpper(userName) = upper(userName)
This option incorrectly uses the var keyword. In DataWeave, var is used for variable declarations, not function declarations. Since the question is about defining a function, this is not the correct syntax.

Option B: fun toUpper(userName) = upper(userName)
This is the correct syntax for defining a function in DataWeave. The fun keyword is used to declare the function, and the expression after the = sign calls the upper function to convert the string userName to uppercase.

Option C: var toUpper(userName) -> upper(userName)
This option uses the var keyword, which is incorrect for defining a function. Additionally, the -> symbol is not valid for defining functions in DataWeave. This syntax does not match the proper function definition format.

Option D: fun toUpper(userName) -> upper(userName)
While this option uses the fun keyword, it incorrectly uses the -> symbol. In DataWeave, the = sign should be used to define the body of the function, not the -> symbol, which is not valid syntax for function definitions.

Therefore, B is the correct answer because it follows the proper syntax for defining a function in DataWeave. It uses the fun keyword to declare the function and the = sign to assign the result of the upper(userName) operation to the function.

Question No 3:

Refer to the exhibits. A Mule application polls a database table. This error is logged when the Mule application is run.

What should be changed in the Database connector configuration to resolve this error?

A. Configure the correct JDBC driver
B. Configure the correct host URL
C. Configure the correct database name
D. Configure the correct table name

Correct answer: D

Explanation:

In order to resolve the error, the correct table name should be configured in the Database connector. Here's why:

Understanding the Error:

The error mentioned typically occurs when Mule is unable to identify or locate the specified table in the database. This could happen for several reasons, including a misspecified or incorrect table name. The Database connector relies on a specific table name to query the database, and if this name is incorrect or does not exist, it will throw an error.

Option Analysis:

Option A: Configure the correct JDBC driver.
This option suggests that there might be an issue with the JDBC driver being used. However, this is unlikely to be the root cause of the issue if the connection to the database is established successfully. Typically, an incorrect JDBC driver would result in connection failure errors rather than table-specific issues. If the error you are seeing is related to querying or accessing a table, it's more likely that the table name is incorrect rather than the JDBC driver itself.

Option B: Configure the correct host URL.
The host URL is used to establish a connection to the database server. If there were an issue with the host URL, you would typically see a connection error, such as "unable to connect to the database." If the application can connect to the database, this implies that the host URL is correct, and the problem lies elsewhere.

Option C: Configure the correct database name.
The database name is also an important configuration parameter, but if the Mule application is able to connect to the database, it indicates that the database name is already correct. If the database name were wrong, the application would not even be able to establish a connection, let alone attempt to poll a table within it.

Option D: Configure the correct table name.
This option is the most likely solution. If the error is logged when the Mule application attempts to poll a database table, it indicates that the table name might be incorrect in the Database connector configuration. This can easily happen if there is a typo or if the table name in the configuration does not exactly match the name in the database (including case sensitivity). Ensuring that the correct table name is specified in the Database connector configuration will resolve this issue.

The error is likely due to an incorrect table name in the Database connector configuration. Configuring the correct table name (Option D) will allow the Mule application to poll the correct table and resolve the error.

Question No 4:

Refer to the exhibits. The web client sends a POST request to the ACME Orders API with an XML payload. An error is returned.

What should be changed in the request so that a success response code is returned to the web client?

A. Set a request header with the name Content-Type to the value application/octet-stream
B. Set a response header with the name Content-Type to the value application/octet-stream
C. Set a response header with the name Content-Type to the value application/xml
D. Set a request header with the name Content-Type to the value application/xml

Correct Answer: D

Explanation:

When a web client sends a POST request to an API, it is crucial that the request headers correctly indicate the type of content being sent to the server. In this case, the web client is sending an XML payload. For the server to understand that the data being sent is in XML format, the Content-Type request header must reflect that.

Content-Type is a header that informs the server about the type of the body content in the HTTP request. If this header is missing or incorrectly set, the server may not correctly interpret the data, leading to an error.

A. Set a request header with the name Content-Type to the value application/octet-stream
This option is incorrect because application/octet-stream is a generic content type used to indicate binary data, not XML. If you set this value for XML data, the server may fail to correctly parse the XML and return an error.
B. Set a response header with the name Content-Type to the value application/octet-stream
This option is incorrect because the question is asking about the request, not the response. A response header is related to the data the server returns, but in this case, the client is having an issue with sending the request correctly. Thus, changing the response header wouldn't resolve the issue.
C. Set a response header with the name Content-Type to the value application/xml
This option is incorrect because, like option B, it deals with the response header. However, the error is happening on the request side, and adjusting the response header will not solve the problem.
D. Set a request header with the name Content-Type to the value application/xml
This option is correct. By setting the Content-Type of the request to application/xml, the server will know that the payload being sent is in XML format. This enables the server to correctly parse and process the XML, which is necessary for returning a successful response. If the content type is incorrectly set, the server might not know how to process the data, leading to an error.

In conclusion, the key to solving this problem is ensuring that the correct Content-Type is set for the request header. In this case, the correct choice is D, which specifies that the content being sent is XML.

Question No 5:

What is the correct syntax to add a customer ID as a URI parameter in an HTTP Listener's path attribute?

A. {customerID}
B. #[customerID]
C. $( customerID)
D. (customerID)

Answer: A

Explanation:

In the context of configuring an HTTP Listener in a system such as MuleSoft or a similar platform, the syntax used to represent a URI parameter typically follows a specific pattern. These URI parameters are placeholders that allow for dynamic data to be passed through the URL when making a request to the server. Let's break down the options and explain why A is the correct one.

A. {customerID}
This syntax is commonly used in many systems, especially in platforms like MuleSoft. The curly braces {} are used to define a path parameter, meaning that when a request is made to the endpoint, the value of customerID is passed as part of the URI path. This syntax indicates that customerID is a variable in the URL, and its value will be substituted dynamically when a request is made. For example, if the HTTP Listener's path is /customers/{customerID}, then a request like /customers/12345 will pass 12345 as the customerID.
B. #[customerID]
This syntax appears to resemble a data expression language used in certain integrations like MuleSoft’s DataWeave or for dynamic values in a message flow. While #[customerID] may be used to refer to a variable in a message or expression, it is not the correct format for defining URI path parameters in an HTTP Listener. This is more about invoking a dynamic expression in the flow rather than a direct path parameter.
C. $(customerID)
The $() syntax is often associated with parameter substitution in shell scripting or certain templating engines. However, this is not the standard syntax used for URI parameters in HTTP Listener configurations. While it may look similar to other templating systems, it is not the right way to define a path variable in many integration frameworks, including the most common ones like MuleSoft.
D. (customerID)
This syntax does not match the conventions for path parameters in HTTP Listener configurations. Parentheses () are not typically used to define path variables in integration platforms. Therefore, this is not the correct syntax.

In conclusion, A. {customerID} is the correct syntax because curly braces {} are the standard format for defining dynamic URI parameters in many integration tools, such as MuleSoft’s HTTP Listener. This format allows for the dynamic substitution of values in the URI, which is essential for handling different customer IDs in API requests.

Question No 6:

What is a valid DataWeave expression to set as the message attribute of the Logger to access the value "Max" from the Mule event?

A. "customer.first"
B. vars."customer"."first"
C. vars."customer.first"
D. customer.first

Answer: B

Explanation:

In this case, the Set Variable transformer is set with a value of #[ { first: "Max", last: "Mule" } ], meaning it defines an object with two keys: first and last. The value associated with the first key is "Max", and the last key holds the value "Mule". This value is stored in a variable, presumably under the name customer.

To access the value "Max" from this Mule event, you need to use DataWeave, which is a powerful expression language in MuleSoft used for data transformation. The task is to identify which expression will correctly access the first key in the customer object.

Let’s break down the options:

A. "customer.first"
This option uses a string representation, which will treat customer.first as a literal string rather than as a reference to the variable customer. DataWeave expressions do not typically use quotes around keys or variables unless you're working with string literals. This would not work to access the actual value of "Max".
B. vars."customer"."first"
This expression accesses the variable customer stored in the vars context. It first refers to the vars scope, which holds all variables within the Mule event. Then, it accesses the "customer" variable and retrieves the first property. The use of double quotes around customer and first is necessary in case the key names contain special characters or if the key names are dynamically defined. This expression will correctly access the value of "Max" from the customer variable.
C. vars."customer.first"
This option tries to access a single key "customer.first", which is incorrect. DataWeave does not interpret "customer.first" as an object with a nested first property under customer. Instead, it treats "customer.first" as a single string key, which would not match any actual data structure in this context. This will not give the correct result.
D. customer.first
This expression would work if the variable was referenced directly without the need for the vars scope. However, the correct syntax for accessing variables in DataWeave typically requires the vars keyword to specify that it is a variable. Without it, DataWeave might not recognize the variable as expected unless it is a globally accessible value. Thus, this expression might not work in this specific context.

In conclusion, the correct answer is B, as it correctly references the customer variable within the vars context and uses the correct syntax to access the first property.

Question No 7:

Given that the Mule application does not define any global error handlers and the File Write operation throws a FILE:CONNECTIVITY error, what response message will be returned to the web client?

A. "File written"
B. "ORDER:NOT_CREATED"
C. "FILE:CONNECTIVITY"
D. "OTHER ERROR"

Answer: C

Explanation:

In this scenario, the Mule application is receiving a POST request from a web client, and the File Write operation fails due to a FILE:CONNECTIVITY error. Since there are no global error handlers defined in the application, the error will propagate according to the default error handling behavior in Mule.

When no global error handlers are configured, Mule relies on default error handling mechanisms. If an error occurs in an operation such as the File Write operation, and there is no explicit error handling defined, the error will typically be communicated back to the client, often in the form of an error message that represents the nature of the problem.

In this case, the error that occurred is specifically identified as FILE:CONNECTIVITY. Without any custom error handling logic in place, Mule will pass this error message back as the response to the web client. This means the web client would receive a response containing the error type, which in this case is FILE:CONNECTIVITY.

Let's analyze the other options:

A. "File written": This response would indicate that the file was successfully written. However, since there was an error (the FILE:CONNECTIVITY error), this message would not be returned. The failure of the File Write operation prevents a success message from being sent.
B. "ORDER:NOT_CREATED": This response does not seem to be directly related to the FILE:CONNECTIVITY error. It might indicate a specific business logic error, but it does not match the error caused by the File Write operation. Since the error here is related to file connectivity, this response would not be appropriate.
D. "OTHER ERROR": While this is a general error message, it would typically be used if there were an unspecified or uncaught error in the application. However, the error here is clearly defined as FILE:CONNECTIVITY, so a generic error message like this would not accurately reflect the actual error.

Therefore, the correct response is C. "FILE:CONNECTIVITY", as it directly reflects the error that occurred during the File Write operation and is what the web client would receive in this case.

Question No 8:

What parts of the Mule event at the main flow's Logger component are the same as the Mule event that was input to the HTTP Request operation after it completes?

A. The entire Mule event
B. All variables
C. The payload and all attributes
D. The payload and all variables

Answer: D

Explanation:

In a Mule flow, when an HTTP Request operation is used to call a child flow’s HTTP Listener, the Mule event undergoes a series of transformations as it moves through the flow. At each stage, components such as the HTTP Listener or HTTP Request operation interact with the Mule event, potentially altering its properties (such as the payload, variables, and attributes). The key to answering this question lies in understanding how the Mule event behaves after the HTTP Request operation and what parts of it remain unchanged when it reaches the Logger component in the main flow.

Payload and Variables in Mule Events: The payload refers to the data that flows through the event and is typically manipulated during the flow's execution. Variables, on the other hand, are part of the Mule event that are set during the execution of the flow and can persist across various components in a flow. When an HTTP Request operation is invoked, it does not necessarily change the payload or the variables unless specifically configured to do so within the operation.
HTTP Request Operation: The HTTP Request operation is configured to invoke a child flow's HTTP Listener. When a GET request is sent to this listener with the qty query parameter set to 30, the payload can be modified, or new variables might be created, depending on how the flow is designed. However, after the request completes, the HTTP Request operation generally does not alter the variables or the payload of the Mule event unless explicitly instructed.
Logger Component: After the HTTP Request operation completes, the Logger component is responsible for logging the Mule event. The Logger will capture the Mule event’s current state at the time of logging. Since the variables are persistent across the flow and do not necessarily change unless explicitly modified by components such as DataWeave or Set Variable, and since the payload is not altered by the HTTP Request operation unless a modification step is included, the payload and variables from the Mule event at the time of the HTTP Request operation remain unchanged as they pass through the Logger component.
Conclusion: The payload and variables are the parts of the Mule event that remain the same from the time the HTTP Request operation is executed until it reaches the Logger. The attributes might change (e.g., HTTP headers or other context information) as they are typically handled separately from the payload and variables.

Therefore, the correct answer is D: The payload and all variables.