Spring boot @ExceptionHandler 未捕获子类异常

Question

我创建了一些用于异常处理的子类。该方法抛出子类异常。我为超类和子类创建了@ExceptionHandler。但只有当没有对异常的超类进行处理（handleSuperException(SuperclassExceptionException e)）时，才会处理子类异常。SubClassAException、SubClassBException、SubClassCException 扩展了 SuperclassException 异常。

 public class Controller @PostMapping("/path/") {
       public ResponseEntity<String> method() throws   SuperclassException{
 }
    @ExceptionHandler(SuperclassException.class)   
public ResponseEntity handleSuperException(SuperclassExceptionexception e) {
       //hadle superclass related
    }

 @ExceptionHandler({SubClassAException.class, SubClassBException.class, SubClassCException.class}) 
public ResponseEntity handleSubClassException(SuperclassExceptionexception e) {
//handle more specific
}

但即使抛出子类异常，它也永远不会去handleSubClassException。

Answer 1

无法重现！

这是最小的、可重现的示例，使用 Spring Boot 2.2.0 (Spring 5.2.0) 进行测试。

package web.controller;

import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class FailController {

    @GetMapping("/dmz/fail")
    public String failSuper() {
        throw new SuperclassException("failSuper()");
    }

    @GetMapping("/dmz/failA")
    public String failA() {
        throw new SubClassAException("failA()");
    }

    @GetMapping("/dmz/failB")
    public String failB() {
        throw new SubClassBException("failB()");
    }

    @ExceptionHandler(SuperclassException.class)
    public ResponseEntity<?> handleSuperException(SuperclassException e) {
        return ResponseEntity.badRequest().body("handleSuperException: " + e);
    }

    @ExceptionHandler({SubClassAException.class, SubClassBException.class}) 
    public ResponseEntity<?> handleSubClassException(SuperclassException e) {
        return ResponseEntity.badRequest().body("handleSubClassException: " + e);
    }

}

class SuperclassException extends RuntimeException {
    public SuperclassException(String message) {
        super(message);
    }
}

class SubClassAException extends SuperclassException {
    public SubClassAException(String message) {
        super(message);
    }
}

class SubClassBException extends SuperclassException {
    public SubClassBException(String message) {
        super(message);
    }
}

^{我正在使用/dmz/Spring Security 设置，因此不需要登录。在普通的 Spring Boot 设置中，这当然是不需要的。}

输出 （http://localhost:8080/dmz/fail）

package web.controller;

import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.GetMapping;

@Controller
public class FailController {

    @GetMapping("/dmz/fail")
    public String failSuper() {
        throw new SuperclassException("failSuper()");
    }

    @GetMapping("/dmz/failA")
    public String failA() {
        throw new SubClassAException("failA()");
    }

    @GetMapping("/dmz/failB")
    public String failB() {
        throw new SubClassBException("failB()");
    }

    @ExceptionHandler(SuperclassException.class)
    public ResponseEntity<?> handleSuperException(SuperclassException e) {
        return ResponseEntity.badRequest().body("handleSuperException: " + e);
    }

    @ExceptionHandler({SubClassAException.class, SubClassBException.class}) 
    public ResponseEntity<?> handleSubClassException(SuperclassException e) {
        return ResponseEntity.badRequest().body("handleSubClassException: " + e);
    }

}

class SuperclassException extends RuntimeException {
    public SuperclassException(String message) {
        super(message);
    }
}

class SubClassAException extends SuperclassException {
    public SubClassAException(String message) {
        super(message);
    }
}

class SubClassBException extends SuperclassException {
    public SubClassBException(String message) {
        super(message);
    }
}

输出 （http://localhost:8080/dmz/failA）

handleSuperException: web.controller.SuperclassException: failSuper()

输出 （http://localhost:8080/dmz/failB）

handleSubClassException: web.controller.SubClassAException: failA()