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In a Spring Boot REST controller, what is the role of the @RequestBody annotation when applied to a method parameter?

easy📝 Conceptual Q1 of 15
Spring Boot - REST Controllers
In a Spring Boot REST controller, what is the role of the @RequestBody annotation when applied to a method parameter?
AIt specifies the HTTP response content type.
BIt maps URL query parameters to method arguments.
CIt binds the HTTP request body JSON to a Java object automatically.
DIt validates the request parameters before method execution.
Step-by-Step Solution
Solution:

  1. Step 1: Understand @RequestBody

    The annotation tells Spring to deserialize the HTTP request body (usually JSON) into a Java object.

  2. Step 2: Differentiate from other annotations

    It does not bind query parameters (that is @RequestParam) or affect response content type (@ResponseBody).

  3. Final Answer:

    It binds the HTTP request body JSON to a Java object automatically. -> Option C

  4. Quick Check:

    Request body JSON to Java object binding [OK]
Quick Trick: Binds JSON request body to Java object [OK]
Common Mistakes:
  • Confusing @RequestBody with @RequestParam
  • Thinking it validates input automatically
  • Assuming it sets response content type

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