Spring Boot REST Controller is not parsing the given Json parameter to Java object

Question

Using Spring Boot, I want to build a Rest controller. But Spring fails to convert Json to Java object automatically. And yes:

I have empty constructors
I tried @RequestParam, @RequestBody, @RequestPart
My JSON parameter is valid (I tried to parse with Gson, and it worked)

Here is my REST Controller:

@RestController
public class HelloController {

     @RequestMapping(value= "/abc", method=RequestMethod.POST)
     @ResponseStatus(HttpStatus.OK)
     public @ResponseBody MyResponse handlePurchase(@RequestParam A request){
         return new MyResponse("Simply the best");
     }

}

Here is A.java:

public class A implements Serializable {

    private B something;

    public B getSomething() {
        return Something;
    }

    public void setSomething(B something) {
        this.Something = something;
    }

    @Override
    public String toString() {
        return "A [Something=" + something + "]";
    }

    public A(B something) {
        super();
        this.Something = something;
    }

    public A() {
        super();
    }


}

Here is B.java which is used by A.java:

public class B implements Serializable {
    private String something;
    private int catsNumber;
    private int dogsNumber;

    public String getSomething() {
        return something;
    }

    public void setSomething(String something) {
        this.something = something;
    }

    public int getCatsNumber() {
        return catsNumber;
    }

    public void setCatsNumber(int catsNumber) {
        this.catsNumber = catsNumber;
    }

    public int getDogsNumber() {
        return dogsNumber;
    }

    public void setDogsNumber(int dogsNumber) {
        this.dogsNumber = dogsNumber;
    }

    @Override
    public String toString() {
        return "B [something=" + something + ", catsNumber=" + catsNumber + ", dogsNumber=" + dogsNumber + "]";
    }

    public B() {
        super();
    }


}

Hope someone can help me on this, neither worked yet:

Spring.io
other Stackoverflow Q&As

can you change to @RequestMapping(value= "/abc", method=RequestMethod.POST, produces = MediaType.APPLICATION_JSON_VALUE, consumes= MediaType.APPLICATION_JSON_VALUE) and instead of \@RequestParam use \@RequestBody — kuhajeyan
– kuhajeyan, Commented Aug 12, 2016 at 13:09

JohanB · Accepted Answer · 2016-08-12 09:00:06Z

2

@RequestParam indicates an url parameter http://foo.com?parameter=x. When using post, you need to define a @RequestBody

@RequestMapping(value= "/abc", method=RequestMethod.POST)
@ResponseStatus(HttpStatus.OK)
public @ResponseBody MyResponse handlePurchase(@RequestBody A a){
     return new MyResponse("Simply the best");
}

answered Aug 12, 2016 at 9:00

JohanB

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8 Comments

Janekx Over a year ago

Thanks, but still not working at all (Before changing the "@RequestParam" to "@RequestBody", posting worked well for me): Here's what I get for posting (www-form-urlencoded) { "timestamp": 1470992850627, "status": 415, "error": "Unsupported Media Type", "exception": "org.springframework.web.HttpMediaTypeNotSupportedException", "message": "Content type 'application/x-www-form-urlencoded;charset=UTF-8' not supported", "path": "/purchase" }

Janekx Over a year ago

And the simple form-data:"org.springframework.http.converter.HttpMessageNotReadableException", "message": "Could not read document: Unexpected character ('-' (code 45)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value\n at [Source: java.io.PushbackInputStream@478e62db; line: 1, column: 3]; nested exception is com.fasterxml.jackson.core.JsonParseException: Unexpected character ('-' (code 45)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value\n at [Source: java.io.PushbackInputStream@478e62db; line: 1, column: 3] ... }

JohanB Over a year ago

What tool are you using to generate you post? Can you share your application (github/bitbucket/...)

sag Over a year ago

@Janekx - Set the Content-Type to application/json while posting your request

Janekx Over a year ago

Sorry, I've forgotten, but that is also set.

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