[Solved] What is wrong with this method declaration?@GetMapping("/data") public String getData(@RequestParam(required = false) int count) { return "Count: " + count; } | Spring Boot

Spring Boot - REST Controllers

What is wrong with this method declaration?

@GetMapping("/data")
public String getData(@RequestParam(required = false) int count) {
    return "Count: " + count;
}

AMethod should use @RequestBody instead

BPrimitive int cannot be null, so optional param causes error

Crequired=false is invalid for @RequestParam

DMissing defaultValue causes compilation error

Step-by-Step Solution

Solution:

Step 1: Understand primitive type behavior
Primitive int cannot be null, so if the parameter is missing, Spring cannot assign null.
Step 2: Check optional param with primitive
Using required=false without defaultValue on primitive causes error because no value can be assigned.
Final Answer:
Primitive int cannot be null, so optional param causes error -> Option B
Quick Check:
Use wrapper types for optional primitives [OK]

Quick Trick: Use Integer wrapper for optional int params [OK]

Common Mistakes:

Master "REST Controllers" in Spring Boot

9 interactive learning modes - each teaches the same concept differently

More Spring Boot Quizzes

What is wrong with this method declaration?