How Can I Successfully Deserialize JSON to Java Objects Using Spring MVC\'s @RequestBody?

Spring MVC @RequestBody and JSON Handling

Background: JSON to Java Serialization

The question presents a scenario where JSON serialization to Java objects is successfully implemented using the @ResponseBody annotation. This enables the conversion of Java objects to JSON strings to be sent as responses in the outbound path.

Reverse Path: Java Object Deserialization from JSON

The primary challenge encountered is the conversion of inbound JSON strings to Java objects, which is desired to be achieved using the @RequestBody annotation. As stated in the question, attempts to define a method with @RequestBody as a parameter resulted in the method never being called.

The Solution: Message Converters

The solution to this issue lies in registering the appropriate message converter, specifically the MappingJacksonHttpMessageConverter. By registering this converter, Spring MVC is equipped to handle JSON request bodies. This can be achieved through XML configuration using the tag or through Java configuration using the @EnableWebMvc annotation.

Working Example

The provided code example demonstrates how to register MappingJacksonHttpMessageConverter and set it as the message converter responsible for handling JSON requests. The controller defines a method that accepts a JSON request body and returns a serialized JSON response. By running this example, you can test the bidirectional JSON serialization and deserialization between a client and the Java backend successfully.

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