What does the error message "415 Unsupported Media Type" signify in relation to Spring MVC's inability to handle JSON data?

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The error message "415 Unsupported Media Type" in relation to Spring MVC's inability to handle JSON data signifies that the server is unable to process the JSON data because the media type of the request is not supported. This error message is often caused when the client send JSON data in the wrong format or when the server is not configured to accept JSON data. To resolve this issue, the client needs to ensure that the request is properly formatted with the correct media type, and the server needs to be configured to handle JSON data.