com.fasterxml.jackson.databind.JsonMappingException：由于Spring Boot应用程序中的输入结束，没有要映射的内容

时间：2019-01-03 12:19:24

标签： java spring error-handling jackson jackson-databind

摘要：：我从服务器应用程序向另一个端点发送了一个请求。我收到Http 401错误响应。当我尝试将此错误主体映射到我的错误类时，出现类似以下的异常：

  

com.fasterxml.jackson.databind.JsonMappingException：没有要映射的内容   由于输入结束

详细信息：：我使用Spring Boot和jackson-datatype-jsr310开发了一个服务器应用程序。我在将请求发送到另一个服务器应用程序时使用Spring框架的RestTemplate：

public abstract class AbstractBackendAdapter {

@Autowired
private RestTemplate restTemplate;

@Autowired
private ObjectMapper mapper;

private <T> T exchange(final String url, final HttpMethod method, final HttpEntity request,
    final Class<T> responseType) {

...

final ResponseEntity<T> response;

try {
    response = restTemplate.exchange(url, method, request, responseType);
} catch (HttpServerErrorException exception) {
    throw new BackendHttpServerException(exception, method, url, request.getHeaders());
} catch (HttpClientErrorException exception) {
    throw new BackendHttpClientException(exception, method, url, request.getHeaders());
} catch (HttpMessageNotReadableException exception) {
    throw new BackendHttpMessageNotReadableException(exception, method, url, request.getHeaders());
}
...
}

我不使用默认的Spring错误处理。取而代之的是，我编写了如下的异常处理程序类：

@RestControllerAdvice
public class RestResponseEntityExceptionHandler {

@Autowired
private ObjectMapper mapper;

@Autowired
private HttpServletRequest httpServletRequest;

@ResponseStatus(HttpStatus.BAD_REQUEST)
@ExceptionHandler(value = {BackendHttpClientException.class})
@ResponseBody
protected ErrorResponse handleBackendClientException(final BackendHttpClientException exception,
    final HttpServletResponse response) {

...

    if (HttpStatus.BAD_REQUEST == httpStatus) {
        ...
    } else if (HttpStatus.UNAUTHORIZED == httpStatus) {
        final ClientErrorInfo error;

        try {
            error = mapper.readValue(exception.getResponseBodyAsString(), ClientErrorInfo.class);

            final String errorCode = error.getErrorCode();

            logBackendError(httpMethod, url, headers,
                httpStatus, errorCode, error.getErrorMessage(), error.getErrorCause());

            errorResponse = errorResponseConverter.prepareErrorResponse(errorCode, response);
        } catch (IOException ioException) {
            errorResponse = generateUnexpectedJsonFormatError(ioException);
        }

    }

    return errorResponse;
}

但是，在某些情况下，我收到的Http 401响应为空。我的意思是exception.getResponseBodyAsString（）返回null。因此，mapper.readValue（exception.getResponseBodyAsString（），ClientErrorInfo.class）无法将null值解析为ClientErrorInfo.class。然后，将JsonMappingExcepiton抛出该行-mapper.readValue（exception.getResponseBodyAsString（），ClientErrorInfo.class）。相关日志类似于：

com.fasterxml.jackson.databind.JsonMappingException: No content to map due to end-of-input
 at [Source: ; line: 1, column: 0]
    at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:270)
    at com.fasterxml.jackson.databind.ObjectMapper._initForReading(ObjectMapper.java:3854)
    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3799)
    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2858)
    at com.commencis.butterfly.core.RestResponseEntityExceptionHandler.handleBackendClientException(RestResponseEntityExceptionHandler.java:145)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:97)
    at org.springframework.web.servlet.mvc.method.annotation.ExceptionHandlerExceptionResolver.doResolveHandlerMethodException(ExceptionHandlerExceptionResolver.java:384)
    at org.springframework.web.servlet.handler.AbstractHandlerMethodExceptionResolver.doResolveException(AbstractHandlerMethodExceptionResolver.java:59)
    at org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:136)
    at org.springframework.web.servlet.handler.HandlerExceptionResolverComposite.resolveException(HandlerExceptionResolverComposite.java:74)
    at org.springframework.web.servlet.DispatcherServlet.processHandlerException(DispatcherServlet.java:1222)
    at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1034)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:984)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:661)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.boot.web.filter.ApplicationContextHeaderFilter.doFilterInternal(ApplicationContextHeaderFilter.java:55)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.boot.actuate.trace.WebRequestTraceFilter.doFilterInternal(WebRequestTraceFilter.java:110)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:167)
    at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:80)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.springframework.boot.actuate.autoconfigure.MetricsFilter.doFilterInternal(MetricsFilter.java:106)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

另一方面，当我通过Postman向相同的端点发送相同的请求时，出现填充正文的Http 401错误：

{
    "errorCode": "ERR_C13",
    "errorMessage": "Authorization failed",
    "errorCause": "RETRIEVABLE_PNR_SR_CODE"
}

EDIT-1 ：通过使用Charles，我在服务器应用程序和向其发送请求的端点之间进行了干预，并在收到服务器应用程序之前检查了响应。响应类似于：

HTTP/1.1 401 Unauthorized
Server: Apache-Coyote/1.1
Set-Cookie: JSESSIONID=C157382C48E***9972A77DADC; Path=/crane-ticketing; Secure; HttpOnly
Set-Cookie: rememberMe=deleteMe; Path=/crane-ticketing; Max-Age=0; Expires=Tue, 04-Dec-2018 13:38:02 GMT
Content-Type: application/json;charset=UTF-8
Content-Length: 100
Date: Wed, 05 Dec 2018 13:38:01 GMT
Connection: Keep-alive

{"errorCode":"ERR_C13","errorMessage":"Authorization failed","errorCause":"RETRIEVABLE_PNR_SR_CODE"}

EDIT-2： application.properties中的一些spring-jackson配置行，例如：

spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS = false
spring.jackson.serialization.FAIL_ON_EMPTY_BEANS = false
spring.jackson.deserialization.ADJUST_DATES_TO_CONTEXT_TIME_ZONE = false
spring.jackson.default-property-inclusion=NON_ABSENT
spring.jackson.mapper.AUTO_DETECT_GETTERS=false

如何在服务器应用程序中看到填充实体与Postman中的错误响应相同的错误响应？任何想法将不胜感激！

1 个答案:

答案 0 :(得分：0)

进行一些调试之后，我意识到问题的原因是SimpleClientHttpResponse中的代码，它是Resttemplate的默认响应类。另外，我发现Spring JIRA中存在与此问题有关的一些问题：

参考：https://jira.spring.io/browse/SPR-9367

“使用默认设置在RestTemplate中处理401响应非常困难（不可能）。实际上可以，但是您必须提供错误处理程序和请求工厂。错误处理程序很明显，但是问题是默认请求工厂使用java.net，当您尝试查看响应的状态代码时（尽管它显然可用），它可能引发HttpRetryException。解决方案是使用HttpComponentsClientHttpRequestFactory。”

当我在POM文件中添加下面编写的依赖项时，我的应用程序开始处理401响应主体。

<dependency>
   <groupId>org.apache.httpcomponents</groupId>
   <artifactId>httpclient</artifactId>
</dependency>
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