JSON data type not validated in spring boot - json

Question

I have json like below
"name": {
"title": "Mr",
"firstName": "somename",
"middleName": "middleName",
"lastName": "Micheal",
"maidenName": "maidenName"
}
My POJO class is defined as like below
#JsonInclude(JsonInclude.Include.NON_NULL)
#Data
#Validated
public class Name {
#Length(min = 0,max = 10)
private String title;
#Length(min = 0,max = 50)
private String firstName;
#Length(min = 0,max = 700)
private String middleName;
#Length(min = 0,max = 50)
private String lastName;
#Length(min = 0,max = 50)
private String maidenName;
}
Controller class
#RestController
#RequestMapping("/price/v1")
#Validated
public class MyServerController implements PriceAPI {
#PostMapping(value = "/price",
produces = {"application/json"},
consumes = {"application/json"})
public ResponseEntity<SomeResponse> getmyResponse
(#Valid
#RequestBody Name name) {
return ResponseEntity.ok(myService.getmyResponse(priceData));
}
}
Issue is when I provide integer to my json first name field it is not throwing any error. example
"name": {
"title": "Mr",
"firstName": 123,
"middleName": "middleName",
"lastName": "Micheal",
"maidenName": "maidenName"
}
I tried few options in jackson and explored few Json annotation. But those are not working as expected. Please help me on this.

Answer 1

You will need to include a pattern for the individual field by defining a regular expression with the #Pattern annotation. In this case, for the firstName field, the appropriate #Pattern should be defined as --
#Length(min = 0, max = 50)
#Pattern(regexp = "^[A-Za-z]+$")
private String firstName;
Include a suitable pattern for all the other fields as required.