PDI Question #99: Real Exam Question with Answer & Explanation

Question

Which two scenarios require an Apex method to be called imperatively from a Lightning web component? Choose 2 answer

Options

• ACalling a method that makes a web service callout
• BCalling a method that is not annotated with cacheable-true
• CCalling a method with the click of a button
• DCalling a method that is external to the main controller for the Lightning web component

Explanation

This question identifies specific technical conditions under which an Apex method must be called imperatively from a Lightning web component.

Common mistakes.

• A. While a method making a web service callout must be called imperatively, the fundamental technical reason is that such methods cannot be cacheable=true; thus, option B provides the more general and direct underlying cause.
• C. Calling a method with a button click is a common trigger for imperative invocation, but it is not the underlying technical characteristic of the Apex method itself that necessitates the imperative call. (Methods called this way are often not cacheable=true, fitting option B).

Concept tested. LWC imperative Apex method invocation

Reference. https://developer.salesforce.com/docs/component-library/documentation/lwc/lwc.use_apex_wire_imperative

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