Spring, Angular.js 400 Bad Request

Issue

I’m having a hard time figuring out why this request encounter 400 BAD request :

{
email: "[email protected]"
lastfmUsername: "bluecun"
password: "$2a$10$if246VMeosRCNJibodEhueXGyQNiAHeJd3KVHi7WedjByECYeXO5."
username: "bluecun"
}

Here is my model and controller code :

public class User {
    private Long id;
    private String username;
    private String lastfmUsername;
    private String email;
    private String password;
...
}

@RequestMapping(value = "/register", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE,
            produces = MediaType.APPLICATION_JSON_VALUE)
    public
    @ResponseBody
    void register(@RequestBody User user) throws Exception {
        semanticGraphDao.saveUser(user);
    }

Thanks for the answers.

Solution

First you need to check if you JSON is wellformed, which means: properties surrounded by quotes and a colon between each property, for example:

{
  "email": "[email protected]",
  "lastfmUsername": "bluecun",
  "password": "$2a$10$if246VMeosRCNJibodEhueXGyQNiAHeJd3KVHi7WedjByECYeXO5.",
  "username": "bluecun"
}

On the top of that, check the constructor of your User class. It must have a default constructor:

public class User {
    private Long id;
    private String username;
    private String lastfmUsername;
    private String email;
    private String password;

    public User() {
      
    }
    
    // Getters and Setters
}

And finally, check Spring boot logs – probably it is showing some kind of exception from Jackson, which will guide you on how to solve the mapping issue.

Answered By – leozin

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