Java HttpsStatusCodeException返回null:Spring引导

在这里，我使用Junit5，模拟rest模板调用以返回HttpClientErrorException，但会引发空指针异常。我无法理解为什么在指定行返回Null

休息通话

ResponseEntity<Object> obj;
try{
     obj=restTemplate.postForEntity(url, requestObj, Object.class);    
}catch(HttpStatusCodeException ex){

    ex.getMessage();

   throw new CustomError(ex.getStatusCode()); //ex.getStatusCode is Null and throws Null Pointer Exception
}catch(Exception ex){
  throw....
}

---

有两个选项可以解决此问题，您需要提供

HttpClientErrorException

的模拟及其使用的方法，或者需要将exception对象的实例传递给throw语句

    HttpClientErrorException mockedException = mock(HttpClientErrorException.class);
    when(mockedException.getStatusCode()).thenReturn(HttpStatus.NOT_FOUND);
    ...
    when(restTemplate.postForEntity(anyString(),any(),eq(Object.class)))
.thenThrow(mockedException);

或

    HttpClientErrorException mockedException = mock(HttpClientErrorException.class);
    when(mockedException.getStatusCode()).thenReturn(HttpStatus.NOT_FOUND);
    ...
    when(restTemplate.postForEntity(anyString(),any(),eq(Object.class)))
.thenThrow(mockedException);

when(restTemplate.postForEntity(anyString(),any(),eq(Object.class)))
.thenThrow( new HttpClientErrorException(HttpStatus.NOT_FOUND));