MENDIX ADVANCED QUESTIONS EXAM 2024-2025
ACTUAL EXAM 300 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES||ALREADY
GRADED A
How can I test my POST method? Choose one of the below. - ANSWER-Find the Location property of
my published REST service, open that URL in your browser, go to the POST button of your collection and
add a message.
How can you get a response that shows if the POST method was executed correctly including the
provided data? Choose one of the below. - ANSWER-Go to the connecting microflow of your POST
method, export the information to a JSON String value, change the HTTPResponse object and create an
HTTP header object.
What type of input parameter do you need for the delete microflow belonging to the delete method? -
ANSWER-A unique ID to be able to retrieve the object to delete.
Which of the following is a field of a Mendix log message? - ANSWER-Log node
- ANSWER-In the console
What is the difference between log messages in Studio Pro and log messages in the Developer portal? -
ANSWER-The log messages in the Developer Portal have a Source field.
Where do log messages come from? - ANSWER-Log messages are written by the person who created
the functionality.
When the log level is set to Error, messages from which other log level will also show up in your logs? -
ANSWER-Critical
Which log level is used to warn about unexpected behavior that doesn't need immediate action? -
ANSWER-Warning
,Which statement about log nodes is true? - ANSWER-Log nodes are dynamically registered on
application startup.
Which of the following statements about log levels is true? - ANSWER-Messages at the Info level occur
during normal operation of your app.
Who is responsible for writing the error messages that your application generates? - ANSWER-The
developer.
Which description best describes a Stack Trace? - ANSWER-A list of functions that were being called
when an error occurred.
Why should you use an enumeration for your log node names? - ANSWER-This allows you to
standardize the log node name and group all log node names in your app.
How do you ensure that your log node name is available after startup? - ANSWER-Add a log activity to
a microflow that you call in the After Startup microflow.
You want to add a log event to an error flow on your REST Call to indicate a weather API call failed in your
Holiday Request application. Which level of logging should you use? - ANSWER-Warning, you can still
continue but someone should look into why the REST call is failing and whether further action is needed.
Which of the following is a valid Mendix token? - ANSWER-CurrentUser
You are creating a microflow where you have a Change Object activity. The change is dependent on a lot
of checks and decisions (but, whichever choice, the change always happens). What is the best way to
model this microflow? - ANSWER-Use Decisions, but place them in a sub-microflow to determine what
the new value should be, and then use the return value of that sub-microflow in the Change Object
activity.
, You need to determine what day of the week it is. What is the easiest way to do this? - ANSWER-Use
the formatDateTime function to achieve this.
What is the best approach to retrieve an object over association, while also checking whether the
association exists? - ANSWER-Use a decision to first check whether the association exists. If it does,
retrieve the associated object.
Which of the following statements about lists is true? - ANSWER-A list can have, among others, the
following origins: a retrieve action, the creation of a new list, and the result of an input parameter.
You have to determine how many customers are in the database and find that there are at least a couple
thousand. How do you handle this? - ANSWER-Retrieve all the customers at once and use an
aggregate list activity to count them. Because this is an optimized query on the database, it will be very
light and safe to use, even for big lists.
What does the List Operation tail do? - ANSWER-It grabs all elements in the list except the first
element.
When would you typically use a List Operation? - ANSWER-- To avoid complex XPaths.
- When you are working with objects that only exist in memory.
- When creating report data to view in chart widgets.
You've created a microflow that contains a loop. This loop uses the same logic as a microflow you have
already built, so you decide to call this microflow as a sub-microflow inside the loop so that you can
reuse the functionality. What do you check before doing this? - ANSWER-- If there are retrieve
activities in the sub-microflow for data you already have available in the main microflow, check whether
it can be passed along as an input parameter instead.
- You make sure that there are no commits in the sub-microflow, since it is not good for your application
to commit inside of a loop.
- If the sub-microflow uses a return value, you check whether it is really needed.
ACTUAL EXAM 300 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH RATIONALES||ALREADY
GRADED A
How can I test my POST method? Choose one of the below. - ANSWER-Find the Location property of
my published REST service, open that URL in your browser, go to the POST button of your collection and
add a message.
How can you get a response that shows if the POST method was executed correctly including the
provided data? Choose one of the below. - ANSWER-Go to the connecting microflow of your POST
method, export the information to a JSON String value, change the HTTPResponse object and create an
HTTP header object.
What type of input parameter do you need for the delete microflow belonging to the delete method? -
ANSWER-A unique ID to be able to retrieve the object to delete.
Which of the following is a field of a Mendix log message? - ANSWER-Log node
- ANSWER-In the console
What is the difference between log messages in Studio Pro and log messages in the Developer portal? -
ANSWER-The log messages in the Developer Portal have a Source field.
Where do log messages come from? - ANSWER-Log messages are written by the person who created
the functionality.
When the log level is set to Error, messages from which other log level will also show up in your logs? -
ANSWER-Critical
Which log level is used to warn about unexpected behavior that doesn't need immediate action? -
ANSWER-Warning
,Which statement about log nodes is true? - ANSWER-Log nodes are dynamically registered on
application startup.
Which of the following statements about log levels is true? - ANSWER-Messages at the Info level occur
during normal operation of your app.
Who is responsible for writing the error messages that your application generates? - ANSWER-The
developer.
Which description best describes a Stack Trace? - ANSWER-A list of functions that were being called
when an error occurred.
Why should you use an enumeration for your log node names? - ANSWER-This allows you to
standardize the log node name and group all log node names in your app.
How do you ensure that your log node name is available after startup? - ANSWER-Add a log activity to
a microflow that you call in the After Startup microflow.
You want to add a log event to an error flow on your REST Call to indicate a weather API call failed in your
Holiday Request application. Which level of logging should you use? - ANSWER-Warning, you can still
continue but someone should look into why the REST call is failing and whether further action is needed.
Which of the following is a valid Mendix token? - ANSWER-CurrentUser
You are creating a microflow where you have a Change Object activity. The change is dependent on a lot
of checks and decisions (but, whichever choice, the change always happens). What is the best way to
model this microflow? - ANSWER-Use Decisions, but place them in a sub-microflow to determine what
the new value should be, and then use the return value of that sub-microflow in the Change Object
activity.
, You need to determine what day of the week it is. What is the easiest way to do this? - ANSWER-Use
the formatDateTime function to achieve this.
What is the best approach to retrieve an object over association, while also checking whether the
association exists? - ANSWER-Use a decision to first check whether the association exists. If it does,
retrieve the associated object.
Which of the following statements about lists is true? - ANSWER-A list can have, among others, the
following origins: a retrieve action, the creation of a new list, and the result of an input parameter.
You have to determine how many customers are in the database and find that there are at least a couple
thousand. How do you handle this? - ANSWER-Retrieve all the customers at once and use an
aggregate list activity to count them. Because this is an optimized query on the database, it will be very
light and safe to use, even for big lists.
What does the List Operation tail do? - ANSWER-It grabs all elements in the list except the first
element.
When would you typically use a List Operation? - ANSWER-- To avoid complex XPaths.
- When you are working with objects that only exist in memory.
- When creating report data to view in chart widgets.
You've created a microflow that contains a loop. This loop uses the same logic as a microflow you have
already built, so you decide to call this microflow as a sub-microflow inside the loop so that you can
reuse the functionality. What do you check before doing this? - ANSWER-- If there are retrieve
activities in the sub-microflow for data you already have available in the main microflow, check whether
it can be passed along as an input parameter instead.
- You make sure that there are no commits in the sub-microflow, since it is not good for your application
to commit inside of a loop.
- If the sub-microflow uses a return value, you check whether it is really needed.
