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Spring RestTemplateで空の応答を処理する方法

私の認証サービスは、成功時にhttp 204を、失敗時にhttp 401を返しますが、responseBodyは返しません。 RestTemplateクライアントでこれを使用することはできません。応答をシリアル化しようとして失敗します。ジャクソンからのエラーは、シリアライザーでFAIL_ON_EMPTY_BEANSをオンにすることを示唆していますが、restTemplateでこれを設定するにはどうすればよいですか？

残りのAPIを使用するクライアント

@SuppressWarnings("rawtypes")
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

    RestTemplate restTemplate = new RestTemplate();
    System.out.println("\n\n\n\n ============API REQUEST INTERCEPTOR=============== \n\n\n\n\n");

    if(StringUtils.isBlank(request.getHeader(AuthenticationKeys.AUTHENTICATIONTOKEN.name().toLowerCase()))){
        //TODO AUTHORIZE TOKEN
        ResponseEntity<AuthenticationResponse> authenticateResponse = restTemplate.getForEntity(authenticateUrl, AuthenticationResponse.class);
        if(authenticateResponse.getStatusCode().is2xxSuccessful()){
            //TODO SET THE TOKEN IN THE CONTEXT
            return true;
        }else{
            //TODO DO SOME ERROR HANDLING
            return false;
        }
    }else{
        AuthorizationRequest authorizationRequest = new AuthorizationRequest();
        authorizationRequest.setToken("TESTNG");
        ResponseEntity<Object> authorizationResponse = restTemplate.postForEntity(authorizeUrl, request, Object.class);
        if(authorizationResponse.getStatusCode().is2xxSuccessful()){
            return true;
        }else{
            //TODO DO SOME ERROR HANDLING
            if(authorizationResponse.getStatusCode().equals(HttpStatus.UNAUTHORIZED)){
                response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "Oops! access to this API is not authorized to you.");
            }
            return false;
        }
    }

残りのサービス

@RequestMapping(value="/authorize", method = RequestMethod.POST)
    void authorize(@RequestBody @Valid AuthorizationRequest request, HttpServletResponse response){
        if(request.getToken().equals("TESTING")){
            response.setStatus(HttpServletResponse.SC_NO_CONTENT);
        }else{
            response.setStatus(HttpServletResponse.SC_UNAUTHORIZED);
        }
    }
}

例外

Caused by: com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.Apache.catalina.connector.CoyoteInputStream and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: org.Apache.shiro.web.servlet.ShiroHttpServletRequest["request"]->org.Apache.catalina.connector.RequestFacade["inputStream"])
    at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.Java:59) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.Java:26) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.Java:575) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.Java:663) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.Java:156) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.Java:575) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.Java:663) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.Java:156) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.Java:129) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.Java:2238) ~[jackson-databind-2.5.0.jar:2.5.0]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.Java:231) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    ... 52 more

試行された修正

RestTemplate restTemplate = new RestTemplate();
        List<HttpMessageConverter<?>> converters = restTemplate.getMessageConverters();
        for(HttpMessageConverter<?> converter : converters){
            if(converter instanceof MappingJackson2HttpMessageConverter){
                ((MappingJackson2HttpMessageConverter) converter).getObjectMapper().configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
            }
        }

次のエラー

org.springframework.http.converter.HttpMessageNotWritableException: Could not write content: getInputStream() has already been called for this request (through reference chain: org.Apache.shiro.web.servlet.ShiroHttpServletRequest["request"]->org.Apache.catalina.connector.RequestFacade["reader"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: getInputStream() has already been called for this request (through reference chain: org.Apache.shiro.web.servlet.ShiroHttpServletRequest["request"]->org.Apache.catalina.connector.RequestFacade["reader"])
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.Java:238) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.Java:208) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.client.RestTemplate$HttpEntityRequestCallback.doWithRequest(RestTemplate.Java:777) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.Java:566) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.Java:529) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.Java:356) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at mordeth.orchestration.interceptor.ApiRequestInterceptor.preHandle(ApiRequestInterceptor.Java:120) ~[ApiRequestInterceptor.class:?]
    at org.springframework.web.servlet.HandlerExecutionChain.applyPreHandle(HandlerExecutionChain.Java:134) ~[spring-webmvc-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.Java:938) [spring-webmvc-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.Java:877) [spring-webmvc-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.Java:966) [spring-webmvc-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.Java:868) [spring-webmvc-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.Java:646) [servlet-api.jar:?]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.Java:842) [spring-webmvc-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.Java:727) [servlet-api.jar:?]
    at org.Apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.Java:303) [catalina.jar:7.0.57]
    at org.Apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.Java:208) [catalina.jar:7.0.57]
    at org.Apache.Tomcat.websocket.server.WsFilter.doFilter(WsFilter.Java:52) [Tomcat7-websocket.jar:7.0.57]
    at org.Apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.Java:241) [catalina.jar:7.0.57]
    at org.Apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.Java:208) [catalina.jar:7.0.57]
    at mordeth.orchestration.controller.CorsFilter.doFilterInternal(CorsFilter.Java:21) [CorsFilter.class:?]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.Java:107) [spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.Apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.Java:241) [catalina.jar:7.0.57]
    at org.Apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.Java:208) [catalina.jar:7.0.57]
    at org.Apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.Java:449) [shiro-web-1.2.0.jar:1.2.0]
    at org.Apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.Java:365) [shiro-web-1.2.0.jar:1.2.0]
    at org.Apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.Java:90) [shiro-core-1.2.0.jar:1.2.0]
    at org.Apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.Java:83) [shiro-core-1.2.0.jar:1.2.0]
    at org.Apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.Java:380) [shiro-core-1.2.0.jar:1.2.0]
    at org.Apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.Java:362) [shiro-web-1.2.0.jar:1.2.0]
    at org.Apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.Java:125) [shiro-web-1.2.0.jar:1.2.0]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.Java:344) [spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.Java:261) [spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    at org.Apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.Java:241) [catalina.jar:7.0.57]
    at org.Apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.Java:208) [catalina.jar:7.0.57]
    at org.Apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.Java:67) [log4j-web-2.0.jar:2.0]
    at org.Apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.Java:241) [catalina.jar:7.0.57]
    at org.Apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.Java:208) [catalina.jar:7.0.57]
    at org.Apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.Java:220) [catalina.jar:7.0.57]
    at org.Apache.catalina.core.StandardContextValve.invoke(StandardContextValve.Java:122) [catalina.jar:7.0.57]
    at org.Apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.Java:503) [catalina.jar:7.0.57]
    at org.Apache.catalina.core.StandardHostValve.invoke(StandardHostValve.Java:170) [catalina.jar:7.0.57]
    at org.Apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.Java:103) [catalina.jar:7.0.57]
    at org.Apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.Java:950) [catalina.jar:7.0.57]
    at org.Apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.Java:116) [catalina.jar:7.0.57]
    at org.Apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.Java:421) [catalina.jar:7.0.57]
    at org.Apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.Java:1070) [Tomcat-coyote.jar:7.0.57]
    at org.Apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.Java:611) [Tomcat-coyote.jar:7.0.57]
    at org.Apache.Tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.Java:314) [Tomcat-coyote.jar:7.0.57]
    at Java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.Java:1145) [?:1.7.0_71]
    at Java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.Java:615) [?:1.7.0_71]
    at org.Apache.Tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.Java:61) [Tomcat-coyote.jar:7.0.57]
    at Java.lang.Thread.run(Thread.Java:745) [?:1.7.0_71]
Caused by: com.fasterxml.jackson.databind.JsonMappingException: getInputStream() has already been called for this request (through reference chain: org.Apache.shiro.web.servlet.ShiroHttpServletRequest["request"]->org.Apache.catalina.connector.RequestFacade["reader"])
    at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.Java:210) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.JsonMappingException.wrapWithPath(JsonMappingException.Java:177) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.std.StdSerializer.wrapAndThrow(StdSerializer.Java:190) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.Java:671) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.Java:156) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.Java:575) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.Java:663) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.Java:156) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.Java:129) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.Java:2238) ~[jackson-databind-2.5.0.jar:2.5.0]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.Java:231) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    ... 52 more
Caused by: Java.lang.IllegalStateException: getInputStream() has already been called for this request
    at org.Apache.catalina.connector.Request.getReader(Request.Java:1239) ~[catalina.jar:7.0.57]
    at org.Apache.catalina.connector.RequestFacade.getReader(RequestFacade.Java:505) ~[catalina.jar:7.0.57]
    at Sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_71]
    at Sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.Java:57) ~[?:1.7.0_71]
    at Sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.Java:43) ~[?:1.7.0_71]
    at Java.lang.reflect.Method.invoke(Method.Java:606) ~[?:1.7.0_71]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.Java:536) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.Java:663) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.Java:156) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.Java:575) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.Java:663) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.Java:156) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.Java:129) ~[jackson-databind-2.5.0.jar:2.5.0]
    at com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.Java:2238) ~[jackson-databind-2.5.0.jar:2.5.0]
    at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.Java:231) ~[spring-web-4.1.4.RELEASE.jar:4.1.4.RELEASE]
    ... 52 more
springrestjacksonresttemplate
22
Monish Sen

AuthenticationResponseの代わりにStringを使用します。空の応答を受け取った場合、文字列値は空になります。

ResponseEntity<String> authenticateResponse = restTemplate.getForEntity(authenticateUrl, String.class);

更新：これを確認してください link 。これで問題が解決すると思います。

ResponseEntity<Void> response = restTemplate.getForEntity(authenticateUrl,Void.class);
Void body = response.getBody();
43
Hareesh