Spring 异常处理程序返回部分响应 - 也许是错误？

Question

我正在使用 spring boot 2.0.4 构建 REST 接口(interface)。我使用 ExceptionHandler 来处理错误。

问题:

当序列化时引发异常时，jackson 会抛出 JsonMappingException。我使用默认异常处理程序处理此异常(捕获所有异常)。

@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
@ResponseBody
@ExceptionHandler(Throwable.class)
public String handleThrowable(final Throwable throwable) {
    return "SERVER ERROR";
}

现在，当我返回一大堆对象时，我会出现奇怪的行为，并且其中一个由于 RuntimeException 而失败，我没有得到 500 返回。但我收到一个 200 ，其中包含第一个序列化对象，然后是错误消息。

示例:

我已经准备了一个完整的问题示例: https://github.com/stefan0001/spring-exception-test/tree/master/src/main/java/test

调用时:

GET http://localhost:8080/test

预期结果:

状态:500正文:服务器错误

实际结果:

状态:200正文:

[{"name":"0","throwException":false,"foo":"bar"},{"name":"1","throwException":false,"foo":"bar"},{"name":"2","throwException":false,"foo":"bar"},{"name":"3","throwException":false,"foo":"bar"},{"name":"4","throwException":false,"foo":"bar"},{"name":"5","throwException":false,"foo":"bar"},{"name":"6","throwException":false,"foo":"bar"},{"name":"7","throwException":false,"foo":"bar"},{"name":"8","throwException":false,"foo":"bar"},{"name":"9","throwException":false,"foo":"bar"},{"name":"10","throwException":false,"foo":"bar"},{"name":"11","throwException":false,"foo":"bar"},{"name":"12","throwException":false,"foo":"bar"},{"name":"13","throwException":false,"foo":"bar"},{"name":"14","throwException":false,"foo":"bar"},{"name":"15","throwException":false,"foo":"bar"},{"name":"16","throwException":false,"foo":"bar"},{"name":"17","throwException":false,"foo":"bar"},{"name":"18","throwException":false,"foo":"bar"},{"name":"19","throwException":false,"foo":"bar"},{"name":"20","throwException":false,"foo":"bar"},{"name":"21","throwException":false,"foo":"bar"},{"name":"22","throwException":false,"foo":"bar"},{"name":"23","throwException":false,"foo":"bar"},{"name":"24","throwException":false,"foo":"bar"},{"name":"25","throwException":false,"foo":"bar"},{"name":"26","throwException":false,"foo":"bar"},{"name":"27","throwException":false,"foo":"bar"},{"name":"28","throwException":false,"foo":"bar"},{"name":"29","throwException":false,"foo":"bar"},{"name":"30","throwException":false,"foo":"bar"},{"name":"31","throwException":false,"foo":"bar"},{"name":"32","throwException":false,"foo":"bar"},{"name":"33","throwException":false,"foo":"bar"},{"name":"34","throwException":false,"foo":"bar"},{"name":"35","throwException":false,"foo":"bar"},{"name":"36","throwException":false,"foo":"bar"},{"name":"37","throwException":false,"foo":"bar"},{"name":"38","throwException":false,"foo":"bar"},{"name":"39","throwException":false,"foo":"bar"},{"name":"40","throwException":false,"foo":"bar"},{"name":"41","throwException":false,"foo":"bar"},{"name":"42","throwException":false,"foo":"bar"},{"name":"43","throwException":false,"foo":"bar"},{"name":"44","throwException":false,"foo":"bar"},{"name":"45","throwException":false,"foo":"bar"},{"name":"46","throwException":false,"foo":"bar"},{"name":"47","throwException":false,"foo":"bar"},{"name":"48","throwException":false,"foo":"bar"},{"name":"49","throwException":false,"foo":"bar"},{"name":"50","throwException":false,"foo":"bar"},{"name":"51","throwException":false,"foo":"bar"},{"name":"52","throwException":false,"foo":"bar"},{"name":"53","throwException":false,"foo":"bar"},{"name":"54","throwException":false,"foo":"bar"},{"name":"55","throwException":false,"foo":"bar"},{"name":"56","throwException":false,"foo":"bar"},{"name":"57","throwException":false,"foo":"bar"},{"name":"58","throwException":false,"foo":"bar"},{"name":"59","throwException":false,"foo":"bar"},{"name":"60","throwException":false,"foo":"bar"},{"name":"61","throwException":false,"foo":"bar"},{"name":"62","throwException":false,"foo":"bar"},{"name":"63","throwException":false,"foo":"bar"},{"name":"64","throwException":false,"foo":"bar"},{"name":"65","throwException":false,"foo":"bar"},{"name":"66","throwException":false,"foo":"bar"},{"name":"67","throwException":false,"foo":"bar"},{"name":"68","throwException":false,"foo":"bar"},{"name":"69","throwException":false,"foo":"bar"},{"name":"70","throwException":false,"foo":"bar"},{"name":"71","throwException":false,"foo":"bar"},{"name":"72","throwException":false,"foo":"bar"},{"name":"73","throwException":false,"foo":"bar"},{"name":"74","throwException":false,"foo":"bar"},{"name":"75","throwException":false,"foo":"bar"},{"name":"76","throwException":false,"foo":"bar"},{"name":"77","throwException":false,"foo":"bar"},{"name":"78","throwException":false,"foo":"bar"},{"name":"79","throwException":false,"foo":"bar"},{"name":"80","throwException":false,"foo":"bar"},{"name":"81","throwException":false,"foo":"bar"},{"name":"82","throwException":false,"foo":"bar"},{"name":"83","throwException":false,"foo":"bar"},{"name":"84","throwException":false,"foo":"bar"},{"name":"85","throwException":false,"foo":"bar"},{"name":"86","throwException":false,"foo":"bar"},{"name":"87","throwException":false,"foo":"bar"},{"name":"88","throwException":false,"foo":"bar"},{"name":"89","throwException":false,"foo":"bar"},{"name":"90","throwException":false,"foo":"bar"},{"name":"91","throwException":false,"foo":"bar"},{"name":"92","throwException":false,"foo":"bar"},{"name":"93","throwException":false,"foo":"bar"},{"name":"94","throwException":false,"foo":"bar"},{"name":"95","throwException":false,"foo":"bar"},{"name":"96","throwException":false,"foo":"bar"},{"name":"97","throwException":false,"foo":"bar"},{"name":"98","throwException":false,"foo":"bar"},{"name":"99","throwException":false,"foo":"bar"},{"name":"100","throwException":false,"foo":"bar"},{"name":"101","throwException":false,"foo":"bar"},{"name":"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202","throwException":false,"foo":"bar"},{"name":"203","throwException":false,"foo":"bar"},{"name":"204","throwException":false,"foo":"bar"},{"name":"205","throwException":false,"foo":"bar"},{"name":"206","throwException":false,"foo":"bar"},{"name":"207","throwException":false,"foo":"bar"},{"name":"208","throwException":false,"foo":"bar"},{"name":"209","throwException":false,"foo":"bar"},{"name":"210","throwException":false,"foo":"bar"},{"name":"211","throwException":false,"foo":"bar"},{"name":"212","throwException":false,"foo":"bar"},{"name":"213","throwException":false,"foo":"bar"},{"name":"214","throwException":false,"foo":"bar"},{"name":"215","throwException":false,"foo":"bar"},{"name":"216","throwException":false,"foo":"bar"},{"name":"217","throwException":false,"foo":"bar"},{"name":"218","throwException":false,"foo":"bar"},{"name":"219","throwException":false,"foo":"bar"},{"name":"220","throwException":false,"foo":"bar"},{"name":"221","throwException":false,"foo":"bar"},{"name":"222","throwException":false,"foo":"bar"},{"name":"223","throwException":false,"foo":"bar"},{"name":"224","throwException":false,"foo":"bar"},{"name":"225","throwException":false,"foo":"bar"},{"name":"226","throwException":false,"foo":"bar"},{"name":"227","throwException":false,"foo":"bar"},{"name":"228","throwException":false,"foo":"bar"},{"name":"229","throwException":false,"foo":"bar"},{"name":"230","throwException":false,"foo":"bar"},{"name":"231","throwException":false,"foo":"bar"},{"name":"232","throwException":false,"foo":"bar"},{"name":"233","throwException":false,"foo":"bar"},{"name":"234","throwException":false,"foo":"bar"},{"name":"235","throwException":false,"foo":"bar"},{"name":"236","throwException":false,"foo":"bar"},{"name":"237","throwException":false,"foo":"bar"},{"name":"238","throwException":false,"foo":"bar"},{"name":"239","throwException":false,"foo":"bar"},{"name":"240","throwException":false,"foo":"bar"},{"name":"241","throwException":false,"foo":"bar"},{"name":"242","throwException":false,"foo":"bar"},{"name":"243","throwException":false,"foo":"bar"},{"name":"244","throwException":false,"foo":"bar"},{"name":"245","throwException":false,"foo":"bar"},{"name":"246","throwException":false,"foo":"bar"},{"name":"247","throwException":false,"foo":"bar"},{"name":"248","throwException":false,"foo":"bar"},{"name":"249","throwException":false,"foo":"bar"},{"name":"250","throwException":false,"foo":"bar"},{"name":"251","throwException":false,"foo":"bar"},{"name":"252","throwException":false,"foo":"bar"},{"name":"253","throwException":false,"foo":"bar"},{"name":"254","throwException":false,"foo":"bar"},{"name":"255","throwException":false,"foo":"bar"},{"name":"256","throwException":false,"foo":"bar"},{"name":"257","throwException":false,"foo":"bar"},{"name":"258","throwException":false,"foo":"bar"},{"name":"259","throwException":false,"foo":"bar"},{"name":"260","throwException":false,"foo":"bar"},{"name":"261","throwException":false,"foo":"bar"},{"name":"262","throwException":false,"foo":"bar"},{"name":"263","throwException":false,"foo":"bar"},{"name":"264","throwException":false,"foo":"bar"},{"name":"265","throwException":false,"foo":"bar"},{"name":"266","throwException":false,"foo":"bar"},{"name":"267","throwException":false,"foo":"bar"},{"name":"268","throwException":false,"foo":"bar"},{"name":"269","throwException":false,"foo":"bar"},{"name":"270","throwException":false,"foo":"bar"},{"name":"271","throwException":false,"foo":"bar"},{"name":"272","throwException":false,"foo":"bar"},{"name":"273","throwException":false,"foo":"bar"},{"name":"274","throwException":false,"foo":"bar"},{"name":"275","throwException":false,"foo":"bar"},{"name":"276","throwException":false,"foo":"bar"},{"name":"277","throwException":false,"foo":"bar"},{"name":"278","throwException":false,"foo":"bar"},{"name":"279","throwException":false,"foo":"bar"},{"name":"280","throwException":false,"foo":"bar"},{"name":"281","throwException":false,"foo":"bar"},{"name":"282","throwException":false,"foo":"bar"},{"name":"283","throwException":false,"foo":"bar"},{"name":"284","throwException":false,"foo":"bar"},{"name":"285","throwException":false,"foo":"bar"},{"name":"286","throwException":false,"foo":"bar"},{"name":"287","throwException":false,"foo":"bar"},{"name":"288","throwException":false,"foo":"bar"},{"name":"289","throwException":false,"foo":"bar"},{"name":"290","throwException":false,"foo":"bar"},{"name":"291","throwException":false,"foo":"bar"},{"name":"292","throwException":false,"foo":"bar"},{"name":"293","throwException":false,"foo":"bar"},{"name":"294","throwException":false,"foo":"bar"},{"name":"295","throwException":false,"foo":"bar"},{"name":"296","throwException":false,"foo":"bar"},{"name":"297","throwException":false,"foo":"bar"},{"name":"298","throwException":false,"foo":"bar"},{"name":"299","throwException":false,"foo":"bar"},{"name":"300","throwException":false,"foo":"bar"},{"name":"301","throwException":false,"foo":"bar"},{"name":"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ERROR

查看响应正文末尾的SERVER ERROR。

不知道是bug还是故意的。看起来回复已经写好了或者类似的东西......

引用文献:

SPRING JIRA ISSUE

GITHUB EXAMPLE

Answer 1

一旦提交了 HTTP 响应，就无法更改 HTTP 状态或 header 。此时，该响应可能位于网络缓冲区中，甚至已经发送到客户端。到那时，就没有办法收回了。

因此在这种情况下，Spring 无法更改响应。

从客户端的角度来看，如果响应不完整(例如，其长度反射(reflect)了 Content-Length header )，then the RFC says the client should close the connection and consider the response incomplete .