Multipart Request with Custom DTO using Spring Boot

Question

Below is my Rest api which accepts a multipart file and a custom dto

@RequestMapping(path="/manual", method = RequestMethod.POST) 
public ResponseEntity<?> createObject(@RequestPart CustomDTO dto, @RequestPart(name = "file", required = true) MultipartFile file) { 

    //Some code here

}

Following is a CustomDTO

public class CustomDTO implements Serializable { 

// Few attributes and its respective getters and setter are there

}

Now on making a request it gives me an error as below

But if in rest api instead of CustomDTO if I make the data type as String then it works properly and then using objectmapper I am able to convert it to CustomDTO . But please help me out on how to directly accept it as CustomDTO and not String.

Note: Am using Spring Boot

Answer 1

try below one.

@RequestMapping(value = "/manual", method = RequestMethod.POST)
public ResponseEntity<?> createObject( @Valid CustomDTO dto, @RequestParam("file") MultipartFile file ) {
        //
}