[FIXED] Why HttpStatusCodeException is not caught when a 400 is thrown?

Issue

cConsider the below class, when a 400 BAD_REQUEST is thrown by the rest call, I expect the HttpStatusCodeException to get caught, but instead it catches unexpected error Exception and throws an Internal Server Error. Why is HttpStatusCodeException not caught when a "BAD_REQUEST" is thrown?

 class Abc {
    
     @Autowired
     RestTemplate template;
    
     
     void connect(){
    
        ResponseEntity<String> response;
    
        try{
            response=restTemplate.postForEntity("url", HTTP_ENTITY, String.class);
    
        } catch( HttpStatusCodeException ex){
             throws new CustomErrorResponse(ex.getStatusCode());
        } catch (Exception ex){
             throws new CustomErrorResponse(Internal_Server_Error);
        }
      }
    
    }

JUnit Testcases

 when(restTemplate.postForEntity(anyString(),any(),eq(String.class))).thenThrow(new CustomErrorResponse(HttpStatus.BAD_REQUEST));

But Internal Server is thrown

Solution

Your test case with restTemplate then throws CustomErrorResponse not HttpStatusCodeException

Solution:

when(restTemplate.postForEntity(anyString(),any(),eq(String.class))).thenThrow(new HttpStatusCodeException(..));

Answered By - Ngo Tuoc
Answer Checked By - Pedro (JavaFixing Volunteer)