[Solved] What is wrong with this Spring Boot controller class? @Controller public class MyController { @GetMapping("/data") public String getData() { return "data"; } } | Spring Boot

Spring Boot - Spring Annotations

What is wrong with this Spring Boot controller class?

@Controller
public class MyController {
    @GetMapping("/data")
    public String getData() {
        return "data";
    }
}

AMethod getData should be private

BURL mapping is incorrect

CClass should be annotated with @Service

DMissing @ResponseBody annotation to return plain text

Step-by-Step Solution

Solution:

Step 1: Understand @Controller behavior
@Controller methods by default return view names, not response bodies.
Step 2: Fix to return plain text
Adding @ResponseBody tells Spring to send the returned string as HTTP response body.
Final Answer:
Missing @ResponseBody annotation to return plain text -> Option D
Quick Check:
Return plain text requires @ResponseBody [OK]

Quick Trick: Add @ResponseBody to return raw data from controller methods [OK]

Common Mistakes:

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What is wrong with this Spring Boot controller class?