Spring Clients are not properly aware of server exceptions when the jackson serialized output does not resolve the circular dependency

Affects: spring boot 2.7.9/spring mvc 5.3.25 & jackson 2.13.5 Describe the bug Clients are not properly aware of server exceptions when the jackson serialized output does not resolve the circular dependency

Define a global exception catcher：

@RestControllerAdvice
public class GlobalExceptionHandler {

    Logger logger = LoggerFactory.getLogger(GlobalExceptionHandler.class);

    @ExceptionHandler(value = Exception.class)
    public Result exceptionHandler(Exception e){
        logger.error(e.getMessage(), e);
        return Result.error(e.getMessage());
    }

    @ExceptionHandler(value = RuntimeException.class)
    public Result exceptionHandlerRuntimeException(Exception e){
        logger.error(e.getMessage(), e);
        return Result.error(e.getMessage());
    }
}

Define a test object. Here @JsonBackReference @JsonManagedReference @JsonIgnore @JsonIdentityInfo is not used to resolve the circular dependency.

@Getter
@Setter
@AllArgsConstructor
@NoArgsConstructor
public class Person {
    private String name;
    private Integer age;
    private Person father;
}

Define a test interface that has cyclic dependencies：

  public Result test2 (){
        List<Person> list = new ArrayList<>();
        Person obj1 = new Person("张三", 48, null);
        Person obj2 = new Person("李四", 23, null);
        obj1.setFather(obj2);
        obj2.setFather(obj1);

        list.add(obj1);
        list.add(obj2);

        Person obj3 = new Person("王麻子", 17, null);
        list.add(obj3);

        List<Person> young = list.stream().filter(e -> e.getAge() <= 45).collect(Collectors.toList());
        List<Person> children =  list.stream().filter(e -> e.getAge()< 18).collect(Collectors.toList());

        HashMap map = new HashMap();
        map.put("young", young);
        map.put("children", children);

        return Result.success(map);
    }

The value result object structure is returned, and the code status code contains 200 and 500, indicating success and failure, respectively

    private String code; //  200 = success  / 500 = server failed 
    private Boolean success;
    private T data;
    private String msg;

Expected behavior The expected return value

{
    "code":"500",
    "data":null,
    "msg":"Handler dispatch failed; nested exception is java.lang.StackOverflowError",
    "success":false
}

The actual return value

{
    "code":"200",
    "data":{"young":[{"name":"李四","age":23,"father":{"name":"张三","age":48}]}"
    "success":true
}
{
    "code":"500",
    "data":null,
    "msg":"Handler dispatch failed; nested exception is java.lang.StackOverflowError",
    "success":false
}

If I only use servlet without using the spring MVC, as shown in the following code, may also get up to the same conclusion.

public class TestServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        PrintWriter out = response.getWriter();
        response.setContentType("text/html;charset=UTF-8");
        JsonFactory factory = new JsonFactory();
        JsonGenerator jsonGenerator = factory.createGenerator(response.getWriter());
        ObjectMapper objectMapper = new ObjectMapper();
        ObjectWriter objectWriter = objectMapper.writer();
        try {
            HashMap map = getResult();
            objectWriter.writeValue(jsonGenerator, Result.success(map));
        } catch (Exception e){
            e.printStackTrace();
            objectWriter.writeValue(jsonGenerator, Result.error(e.getMessage()));
        } finally {
            if (jsonGenerator != null) {
                jsonGenerator.close();
            }
            out.close();
        }
    }

    public HashMap getResult() {
        List<Person> list = new ArrayList<>();
        Person obj1 = new Person("张三", 48, null);
        Person obj2 = new Person("李四", 23, null);
        obj1.setFather(obj2);
        obj2.setFather(obj1);

        list.add(obj1);
        list.add(obj2);

        Person obj3 = new Person("王麻子", 17, null);
        list.add(obj3);

        List<Person> young = list.stream().filter(e -> e.getAge() <= 45).collect(Collectors.toList());
        List<Person> children =  list.stream().filter(e -> e.getAge()< 18).collect(Collectors.toList());

        HashMap map = new HashMap();
        map.put("young", young);
        map.put("children", children);

        return map;
    }
}

The problem here is that objectWriter.writeValue() is used as the stream output, flush out 200 status codes in the buffer before the serialization exception. If use objectWriter writeValueAsString () there is no such problem.

https://github.com/spring-projects/spring-framework/blob/5.3.x/spring-web/src/main/java/org/springframework/http/converter/json/AbstractJackson2HttpMessageConverter.java#L456

Comment From: nyingping

Below is the full actual return value

{"code":"200","success":true,"data":{"young":[{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"father":{"name":"李四","age":23,"father":{"name":"张三","age":48,"fa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Comment From: bclozel

Hello @nyingping, As you've noticed, this is not a problem specific to Spring MVC, but to all web frameworks in general.

When an exception occurs while writing to the HTTP response body, chances are the response headers and status are commited (meaning, possibly written to the network) and cannot be changed anymore. Performing the serialization to a String instance is an unacceptable tradeoff, as this would lead to large memory allocations for Spring applications.

I'm closing this issue as a result.