ajax POST + spring controller parameter passing error

Question

I have strange problem with passing an Int param in POST request to the Spring MVC controller.

The thing is that a parameter is passed through POST, but didn't parsed by the controller.

Here is the Code: Spring Controller:

@Controller
@RequestMapping("user")
public class UserController {
    @RequestMapping(value = "/register", method = RequestMethod.POST)
    @ResponseBody
    public JsonResponse AddUser(@RequestBody User user){
        System.out.println(user.getCondoID());
        System.out.println(user.getPassword());
        System.out.println(user.getUsername());

        *** SOME MY STUFF ***
}

User model:

public class User {
    private String username;
    private String password;
    private int condo_id;
    private List<String> roles;

    public List<String> getRoles() {
        return roles;
    }
    public void setRoles(List<String> roles) {
        this.roles = roles;
    }

    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }

    public int getCondoID() {
        return condo_id;
    }
    public void setCondoID(int condo_id) {
        this.condo_id = condo_id;
    }
}

How do i send POST in Angular(example):

$scope.choosenCondo.id = "7";
var formData = {
    "username" : $scope.registerUser.email,
    "password" : $scope.registerUser.password,
    "condo_id" : parseInt($scope.choosenCondo.id)
};

var req = {
    method: 'POST',
    url: '/api/user/register',
    headers: {
        'X-CSRF-TOKEN': $('input[name="_csrf"]').val(),
        'Upgrade-Insecure-Requests': "1",
        //'Content-Type': "application/x-www-form-urlencoded"
        'Content-Type': 'application/json'
    },
    data: formData
}

$http(req)

So, for System.out.println(user.getCondoID()); i receive "0" in log. But the POST data looks like this for example: {"username":"4t654y54y54y","password":"1q2w3e","condo_id":2} so the param is sent in POST. What can be a reason of this trouble?

Maybe your getter/setter for condo_id variable are not following the nomenclature conventions, so condo_id cannot be serialized correclty. Could you try it changing these methods for getCondo_id() and setCondo_id(int condo_id)? or changing the variable name from condo_id to condoId. — troig
– troig, Commented Aug 25, 2015 at 8:25
"Could you try it changing these methods" change it to what? — user1935987
– user1935987, Commented Aug 25, 2015 at 8:51
getCondoID() -> getCondo_id() and setCondoID(int condo_id) -> setCondo_id(int condo_id). — troig
– troig, Commented Aug 25, 2015 at 9:00
Use proper camelcase for your variables/methods. int condo_id would become Integer condoId (prefer to use Objects rather then primitives). Next let your IDE generate the getters/setters. — s.ijpma
– s.ijpma, Commented Aug 25, 2015 at 9:02

ParagFlume · Accepted Answer · 2015-08-25 11:42:53Z

1

Your User Model should be like

public class User {
    private String username;
    private String password;
    private int condo_id;
    private List<String> roles;

    public List<String> getRoles() {
        return roles;
    }
    public void setRoles(List<String> roles) {
        this.roles = roles;
    }

    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }

    public int getCondo_id() {
        return condo_id;
    }

    public void setCondo_id(int condo_id) {
        this.condo_id = condo_id;
    }

    /*
    public int getCondoID() {
        return condo_id;
    }
    public void setCondoID(int condo_id) {
        this.condo_id = condo_id;
    }
    */
}

It didn't find the actual setter method to set the value for the property "condo_id".

So, for System.out.println(user.getCondoID()); i receive "0" in log.

By java nature, primitive value default initialized to 0, so it is printing 0

answered Aug 25, 2015 at 11:42

ParagFlume

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4 Comments

user1935987 Over a year ago

private Integer condo_id; Declare as Interger thats what helps :)

ParagFlume Over a year ago

When you define as private Integer condo_id;, If there is no values coming it will be initialized to null,

ParagFlume Over a year ago

When you define as private int condo_id;, If there is no values coming it will throw exception, NULL can not be assigned to primitive type

user1935987 Over a year ago

value is coming, it wasn't parsed. private Integer condo_id; this helped

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