Java 如何处理 spring rest API 上的内部服务器错误 (500)？
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How to handle Internal server error (500) on spring rest API?
提问by user3454581
Good day,
再会，
I am working on spring rest api and i would like to sure everything is working fine. I would like to log abnormal behaviors like nullPointerException or database connection error or any Exception that could raise and not handled or not assumed.
我正在研究 spring rest api，我想确保一切正常。我想记录异常行为，如 nullPointerException 或数据库连接错误或任何可能引发但未处理或未假设的异常。
I would like to catch any unhandled exception and show a beautifull message to user instead of printing stack trace.
我想捕获任何未处理的异常并向用户显示一条漂亮的消息，而不是打印堆栈跟踪。
for this i found a solution on internet that is extend ResponseEntityExceptionHandler and override handleExceptionInternal method.
为此，我在互联网上找到了一个扩展 ResponseEntityExceptionHandler 并覆盖 handleExceptionInternal 方法的解决方案。
I also like to log 404 errors to see if someone trying to attack on my server.
我也喜欢记录 404 错误，看看是否有人试图攻击我的服务器。
I have also added this line in properties file : spring.mvc.throw-exception-if-no-handler-found=true
我还在属性文件中添加了这一行：spring.mvc.throw-exception-if-no-handler-found=true
and here is the code for handleExceptionInternal
这是 handleExceptionInternal 的代码
@Override
protected ResponseEntity<Object> handleExceptionInternal(Exception ex, Object body, HttpHeaders headers, HttpStatus status, WebRequest request) {
GenericResponse response = new GenericResponse();
response.setMessage("Internal error occured, " + ex.getStackTrace()[0]);
System.out.println("big exceptions");
return new ResponseEntity(response, headers, status);
}
My problem is when i am passing incorrect route like /abc this code is running fine, But when i throw null pointer exception from controllers method this method is not catching it.
我的问题是当我传递像 /abc 这样的错误路由时，此代码运行良好，但是当我从控制器方法中抛出空指针异常时，此方法没有捕获它。
thanks.
谢谢。
采纳答案by Bogdan Oros
@ControllerAdvice
public class Handler {
@ExceptionHandler(Exception.class)
public ResponseEntity<Object> handle(Exception ex,
HttpServletRequest request, HttpServletResponse response) {
if (ex instanceof NullPointerException) {
return new ResponseEntity<>(HttpStatus.BAD_REQUEST);
}
return ResponseEntity.status(HttpStatus.INTERNAL_SERVER_ERROR).build();
}
}
ExceptionHandlerDocumenation - here you can find all objects the method signature can operate with.
ExceptionHandler文档 - 在这里您可以找到方法签名可以操作的所有对象。
ControllerAdvice- with no additional properties it will handle all exceptions, so it can provide unexpected behavior. It's better to provide a package (your package) to basePackagesproperty and it will handle only exceptions thrown in specified package.
ControllerAdvice- 没有额外的属性，它将处理所有异常，因此它可以提供意外的行为。最好为basePackages属性提供一个包（你的包），它只会处理指定包中抛出的异常。
Also it is a good practice to separate Exceptions to custom @ExceptionHandlermarked methods, it will decouple the handlers logic.
此外，将异常与自定义@ExceptionHandler标记的方法分开也是一种很好的做法，它将分离处理程序逻辑。
