A developer wants to validate a query parameter in a Spring Boot controller method. Which is the correct way to do this?

medium📝 Debug Q7 of 15

Spring Boot - Request and Response Handling

AAdd <code>@NotNull</code> on the controller class.

BAdd <code>@RequestBody</code> on the query parameter.

CAdd <code>@NotNull</code> on the query parameter and annotate the controller with <code>@Validated</code>.

DAdd <code>@Valid</code> on the controller class only.

Step-by-Step Solution

Solution:

Step 1: Understand validation on query parameters
Query parameters are simple method parameters and require @Validated on the controller to activate validation.
Step 2: Use @NotNull on the parameter to trigger validation
Adding @NotNull on the query parameter triggers validation of constraints like @NotNull.
Final Answer:
Add @NotNull on the query parameter and annotate the controller with @Validated. -> Option C
Quick Check:
Query param validation needs @Validated + @NotNull = C [OK]

Quick Trick: Use @Validated on controller and @Valid on query params [OK]

Common Mistakes:

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