json parsing error in Springboot

Question

I have a simple springboot program which takes a json and prints it. The main intention was to do json validator package usage, but the current context is on the basic request parsing. The problem is when i tryy to map the input request into an class entity, it is giving the below error : "org.springframework.http.converter.HttpMessageNotReadableException",.

• Controller ( Hello.java ) :

      @RequestMapping(method = RequestMethod.POST , consumes = "application/json")
      public ResponseEntity<String> welcome(
              @RequestBody DemoEntity demoEntity )
      {
          System.out.println(demoEntity.getName());
          String response ="success";
          return new ResponseEntity<>(response, HttpStatus.CREATED);
      }
  }
  

• Java Class entity :

  public class DemoEntity implements Serializable {

      @JsonProperty("name")
      private String name;
      @JsonProperty("no")
      private int no;
  
      public int getNo() {
          return no;
      }
  
      public void setNo(int no) {
          this.no = no;
      }
  
      public String getName() {
          return name;
      }
  
      public void setName(String name) {
          this.name = name;
      }
  
      DemoEntity(String name)
      {
          this.name = name;
      }
  }
  

  • Complete Exception :

  { "timestamp": 1497594485418, "status": 400, "error": "Bad Request", "exception": "org.springframework.http.converter.HttpMessageNotReadableException", "message": "JSON parse error: Unexpected character ('-' (code 45)) in numeric value: expected digit (0-9) to follow minus sign, for valid numeric value; 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@75be93a7; line: 1, column: 3]", "path": "/welcome" }

Sample input request in the body : {"name":"Roopesh", "no":123123}

Answer 1

Incase if you are using Postman client to test your Rest API, there are chances wherein you must be adding body in under tab "form-data" rather "raw".

Answer 2

You send incorrect request. Use curl -X POST localhost:8090/one -H 'content-type: application/json;charset=UTF-8' -H 'name: test' -H 'postman-token: 8e87369d-e2e2-ab25-eadd-f40f0682e593' -d '{"name":"Roopesh", "no":"123123"}'

1. Don't sent demoEntity=. Body should contains just json itself.
2. Use -d key to send data. -F is for multipart body. It is a little bit different.