[FIXED] Spring RestController Mapping method has object with null fields when making request with valid JSON body

Issue

I am trying to test my @PostMapping in on of my @RestController. That controller looks like this:

@RestController
public class MyTestController
{
    private static final Logger logger = LogManager.getLogger();

    @PostMapping(path = "/foo")
    public String add(@Valid Boo boo, HttpServletRequest request)
    {
        if (LoadManager.insert(request.getRemoteAddr()) < 3)
            try
            {
                BooManager.persist(boo);
                return "1";
            }
            catch (Exception e)
            {
                logger.error(ExceptionUtils.getStackTrace(e));
            }
        return "0";
    }
}

However boo fields are all null when I make a post request and look at boo object during debug in that add method.

Request body:

{
    "officialName" : "test",
    "phone" : "test",
    "email" : "test",
    "churchArea" : "test",
    "deanery" : "test",
    "town" : "test",
    "pass" : "test152S56"
}

Request header Content-Type is set to application/json

Boo class:

@Data
public class Boo
{
    @Size(max = 1000)
    @NotBlank
    private String officialName;

    @Size(max = 100)
    @NotBlank
    private String phone;

    @Size(max = 100)
    @NotBlank
    private String email;

    @Size(max = 100)
    @NotBlank
    private String churchArea;

    @Size(max = 100)
    @NotBlank
    private String deanery;

    @Size(max = 100)
    @NotBlank
    private String town;

    @Size(max = 1000)
    @NotBlank
    private String pass;
}

@Data annotation is from lombok, which generates, among other things, public getters and setter for that class.

Solution

When you need to bound a request body to method parameter you should use @RequestBody annotation. That's why your Boo object attributes are null.

@PostMapping(path = "/foo")
public String add(@RequestBody Boo boo, HttpServletRequest request)

Docs: https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/bind/annotation/RequestBody.html

Answered By - Lucas Bertollo
Answer Checked By - Clifford M. (JavaFixing Volunteer)