Spring ControllerAdvice全局异常处理程序未返回响应

Question

我有一个Groovy Spring Boot微服务，它返回一个帖子列表。请求进入控制器，控制器调用服务类中的方法，如果没有找到POST，则抛出自定义错误消息。

我已经创建了一个带有@ControllerAdvice注释的控制器，我想截获错误，并创建了一个特定于自定义错误的处理程序。它应该返回一个POJO。目前正在调用ControllerAdvice处理程序，但来自microservice的响应是500错误

控制器

@RequestMapping(value ='getCommentList', method = RequestMethod.POST)
def getCommentList(@RequestBody requestParams) {
    def response
    String userId = requestParams.userId
    String uuid = requestParams.uuid
    response = commentService.findCommentsByUserIdAndUuid(userId, uuid)
}

服务方式

def findCommentsByUserIdAndUuid(String userId, String uuid) {
    User user = userRepository.findByUserId(userId)
    Long userId = tenant?.id
    List responses = commentRepository.findCommentsByUserAndUuidNotDeleted(userId, uuid)
    if (responses.size() == 0) {
        throw new CommentsNotFoundException()
    } else {
        def data = JsonOutput.toJson(retMap)
        return data
    }
}

自定义异常类包com。消息例外

class CommentsNotFoundException extends Exception {
    String errorMessage
    def dataReturned

    public commentsNotFoundException() {
       NewsFeedMessage.buildRequestErrorMessageWithData(errorMessage, dataReturned)
    }
}

将要返回的POGO

package com.news.utils

import org.springframework.http.HttpStatus

class NewsFeedMessage {
    int httpStatus
    String type
    String message
    def dataReturned
    def subMessages = []

    static NewsFeedMessage buildRequestErrorMessageWithData(mainMessage, data) {
        return new NewsFeedMessage(
            httpStatus: 400,
            message: mainMessage,
            dataReturned: data
        )
    }
}

和全局异常处理程序with@ControllerAdvice注释

package com.news.exception

import com.newa.utils.NewsFeedMessage
import org.springframework.boot.configurationprocessor.json.JSON
import org.springframework.http.ResponseEntity
import org.springframework.web.bind.annotation.ControllerAdvice
import org.springframework.web.bind.annotation.ExceptionHandler
import org.springframework.web.context.request.WebRequest
import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler
@ControllerAdvice
public class GlobalExceptionHandler extends ResponseEntityExceptionHandler {

    @ExceptionHandler(CommentsNotFoundException.class)
    public NewsFeedMessage handleException() {
        def response = NewsFeedMessage.buildRequestErrorMessageWithData("testing 1234", [])
        //return response as JSON
    }
}

调试时，代码会尽可能地

        def response = NewsFeedMessage.buildRequestErrorMessageWithData("testing 1234", [])

然而，没有任何回报。使用邮递员返回的邮件为：

{
    "timestamp": "2020-10-23T16:27:35.572+0000",
    "status": 500,
    "error": "Internal Server Error",
    "message": "No message available",
    "path": "/comment/getCommentList"
}

这里有什么明显的错误吗？

Answer 1

我认为NewsFeedMessage不支持返回类型。检查ExceptionHandler文档，发现有一个关于支持的返回类型的块。尝试返回响应属性