How i can get data from json file using ajax - json

Question

i am try to realize Ajax Long Polling in my project
this structure of my project
str
in json file i have this code
{"user": "user","two": "two","three": "three"}
When i am try run my project, i get his in idea console:
WARN 8032 --- [nio-8080-exec-3].w.s.m.s.DefaultHandlerExceptionResolver:Failed to bind request element: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'java.lang.Long'; nested exception is java.lang.NumberFormatException: For input string: "status"
and this in chrome console:
log
I will be grateful for any help

Answer 1

Your javascript file doesn't include jQuery library.
you can include this before bootstrap library ( depend on jQuery ).
<script src="https://code.jquery.com/jquery-3.3.1.min.js" type="text/javascript"></script>

Answer 2

As per your error trace provided here, you're providing non numeric value to status field which is not transforming into Long. Due to this NumberFormatException raised. You can add #ExceptionHandler either in your controller or can define a global exception handler using #ControllerAdvice to handle the exception and send appropriate response message and status code.
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
#ControllerAdvice
public class ApiExceptionHandler {
#ExceptionHandler(Exception.class)
public ResponseEntity<Object> handlerGenericError(Exception ex){
ex.printStackTrace();
return new ResponseEntity<>(ex.getMessage(), HttpStatus.INTERNAL_SERVER_ERROR);
}
#ExceptionHandler(MethodArgumentTypeMismatchException.class)
public ResponseEntity<Object>handlerBadRequest(MethodArgumentTypeMismatchExceptionex){
return new ResponseEntity<>(ex.getMessage(), HttpStatus.BAD_REQUEST);
}
}