Spring JSON request body not mapped to Java POJO

Question

I'm using Spring to implement a RESTful web service. One of the endpoints takes in a JSON string as request body and I wish to map it to a POJO. However, it seems right now that the passed-in JSON string is not property mapped to the POJO.

here's the @RestController interface

@RequestMapping(value="/send", headers="Accept=application/json", method=RequestMethod.POST)
public void sendEmails(@RequestBody CustomerInfo customerInfo);

the data model

public class CustomerInfo {
    private String firstname;
    private String lastname; 
    public CustomerInfo() {
        this.firstname = "first";
        this.lastname = "last";
    }

    public CustomerInfo(String firstname, String lastname)
    {
        this.firstname = firstname;
        this.lastname = lastname;
    }

    public String getFirstname(){
        return firstname;
    }

    public void setFirstname(String firstname){
        this.firstname = firstname;
    }

    public String getLastname(){
        return lastname;
    }

    public void getLastname(String lastname){
        this.lastname = lastname;
    }
}

And finally my POST request:

{"CustomerInfo":{"firstname":"xyz","lastname":"XYZ"}}

with Content-Type specified to be application/json

However, when I print out the object value, the default value("first" and "last") got printed out instead of the value I passed in("xyz" and "XYZ")

Does anyone know why I am not getting the result I expected?

FIX

So it turned out that, the value of request body is not passed in because I need to have the @RequestBody annotation not only in my interface, but in the actual method implementation. Once I have that, the problem is solved.

Answer 1

So it turned out that, the value of request body is not passed in because I need to have the @RequestBody annotation not only in my interface, but in the actual method implementation. Once I have that, the problem is solved.

Answer 2

You can do it in many ways, Here i am going to do it in below different ways-

NOTE: request data shuld be {"customerInfo":{"firstname":"xyz","lastname":"XYZ"}}

1st way We can bind above data to the map as below

@RequestMapping(value = "/send", headers = "Accept=application/json", method = RequestMethod.POST)
public void sendEmails(@RequestBody HashMap<String, HashMap<String, String>> requestData) {

    HashMap<String, String> customerInfo = requestData.get("customerInfo");
    String firstname = customerInfo.get("firstname");
    String lastname = customerInfo.get("lastname");
    //TODO now do whatever you want to do.
}

2nd way we can bind it directly to pojo

step 1 create dto class UserInfo.java

public class UserInfo {
    private CustomerInfo customerInfo1;

    public CustomerInfo getCustomerInfo1() {
        return customerInfo1;
    }

    public void setCustomerInfo1(CustomerInfo customerInfo1) {
        this.customerInfo1 = customerInfo1;
    }
}

step 1. create another dto classCustomerInfo.java

class CustomerInfo {
        private String firstname;
        private String lastname;

        public String getFirstname() {
            return firstname;
        }

        public void setFirstname(String firstname) {
            this.firstname = firstname;
        }

        public String getLastname() {
            return lastname;
        }

        public void setLastname(String lastname) {
            this.lastname = lastname;
        }
    }

step 3 bind request body data to pojo

 @RequestMapping(value = "/send", headers = "Accept=application/json", method = RequestMethod.POST)
    public void sendEmails(@RequestBody UserInfo userInfo) {

        //TODO now do whatever want to do with dto object
    }

I hope it will be help you out. Thanks