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Discover how to manage multiple `@RequestBody` parameters in Spring Boot REST controllers by using a wrapper class. Solve common issues faced by developers and enhance your API design.
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Handling Multiple @RequestBody Parameters in Spring Boot: The Wrapper Class Approach

When developing RESTful APIs using Spring Boot, you might encounter scenarios where you wish to send multiple objects as part of a single request. This can become confusing when trying to utilize @RequestBody for each object. A common question arises: how can we effectively handle multiple @RequestBody parameters in a single API endpoint?

The Problem with Multiple @RequestBody

In the example provided, the user tried to utilize two separate class objects (classA and classB) as parameters for the same endpoint:

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This approach leads to an error:

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The issue arises because Spring Boot does not support multiple @RequestBody annotations in a single method signature, which results in a missing body for at least one of the parameters.

Solution: The Wrapper Class

To resolve this issue, one effective solution is to create a wrapper class that encapsulates the multiple objects. Here’s how to implement it effectively.

Step 1: Create a Wrapper Class

You need to design a new class that holds instances of both classA and classB. Here's an example of how this wrapper class can be structured:

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Step 2: Update the Controller Method

Now, modify the existing controller to accept the new wrapper class instead of individual @RequestBody parameters:

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Step 3: Modify Your JSON Input

With the wrapper class in place, you can now invoke the API using a single JSON object that includes both classA and classB:

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Conclusion

Using a wrapper class is a neat and efficient solution to manage multiple @RequestBody parameters in a single API endpoint in Spring Boot. By restructuring your method to accept a composite object, you can simplify data handling and ensure your API remains clean and maintainable.

This approach not only resolves the problem but also allows for clearer and more organized code. If you find yourself needing to send multiple objects in a request, consider implementing this wrapper pattern for smoother development.

Happy coding!