स्प्रिंग

Question

अपाचे टॉमकैट 8.5 पर वसंत 4.3.1 का उपयोग करते हुए संसाधन AccessException बनाम HttpClientErrorException को फेंकना, हमने एक आरईएसटी सर्वर लागू किया है जो GET, POST & PUT अनुरोधों को प्रबंधित करता है। पोस्ट अनुरोध के रूप में नियंत्रित किया जाता है:

@POST 
@Consumes({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON}) 
@Transactional 
public Response postMethod(final MyDomain object) { 
    domainHandler.createDomain(object); 
    return Response.status(201).entity(object).build(); 
} 

सर्वर साइड पर पोस्ट अनुरोध से निपटने के दौरान, WebApplicationException फेंक दिया जाता है, जिसके द्वारा नियंत्रित किया जाता है:

@Provider 
public class WebExceptionMapper implements ExceptionMapper<WebApplicationException> { 
    @Override 
    public Response toResponse(WebApplicationException exception) { 
      int httpStatus = exception.getResponse().getStatus(); 
      ErrorMessage em = new WebErrorMessage(exception.getMessage()); 
      return Response.status(httpStatus).entity(em).build(); 
    } 
} 

ग्राहक के पक्ष में:

response = rest.exchange(requestURL, method, requestEntity, MyDomain.class); 

ResourceAccessException फेंक दिया जाता है:

2017-07-25 15:46:41,489 ERROR [com.my.code.web.presentation.ManagementController:63] (http-nio-8080-exec-7#34): Internal exception occured with cause: 
org.springframework.web.client.ResourceAccessException: I/O error on POST request for "http://localhost:8080/": Server returned HTTP response code: 500 for URL: http://localhost:8080/; nested exception is java.io.IOException: Server returned HTTP response code: 500 for URL: http://localhost:8080/ 
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:633) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:580) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:498) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at com.my.code.web.integration.client.rest.FeedbackRestClient.callForApiCreateFeedback(FeedbackRestClient.java:218) ~[classes/:?] 
    at com.my.code.web.integration.client.rest.FeedbackRestClient.pushFeedbackData(FeedbackRestClient.java:70) ~[classes/:?] 
    at com.my.code.web.presentation.FeedbackController.feedback(FeedbackController.java:91) ~[classes/:?] 
    at sun.reflect.GeneratedMethodAccessor72.invoke(Unknown Source) ~[?:?] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_131] 
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_131] 
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:114) ~[spring-webmvc-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) [spring-webmvc-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) [spring-webmvc-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) [spring-webmvc-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) [spring-webmvc-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) [servlet-api.jar:?] 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) [spring-webmvc-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) [servlet-api.jar:?] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [catalina.jar:8.5.16] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:8.5.16] 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) [spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:8.5.16] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:8.5.16] 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-websocket.jar:8.5.16] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [catalina.jar:8.5.16] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [catalina.jar:8.5.16] 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [catalina.jar:8.5.16] 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [catalina.jar:8.5.16] 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [catalina.jar:8.5.16] 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [catalina.jar:8.5.16] 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80) [catalina.jar:8.5.16] 
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624) [catalina.jar:8.5.16] 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [catalina.jar:8.5.16] 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [catalina.jar:8.5.16] 
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799) [tomcat-coyote.jar:8.5.16] 
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-coyote.jar:8.5.16] 
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-coyote.jar:8.5.16] 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455) [tomcat-coyote.jar:8.5.16] 
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-coyote.jar:8.5.16] 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_131] 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_131] 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-util.jar:8.5.16] 
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_131] 
Caused by: java.io.IOException: Server returned HTTP response code: 400 for URL: http://localhost:8080/ 
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1876) ~[?:1.8.0_131] 
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1474) ~[?:1.8.0_131] 
    at org.springframework.http.client.SimpleClientHttpResponse.getBody(SimpleClientHttpResponse.java:85) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at com.my.code.web.integration.client.rest.BufferingClientHttpResponseWrapper.getBody(BufferingClientHttpResponseWrapper.java:46) ~[classes/:?] 
    at com.my.code.web.integration.client.rest.LoggingRequestInterceptor.traceResponse(LoggingRequestInterceptor.java:66) ~[classes/:?] 
    at com.my.code.web.integration.client.rest.LoggingRequestInterceptor.intercept(LoggingRequestInterceptor.java:34) ~[classes/:?] 
    at org.springframework.http.client.InterceptingClientHttpRequest$InterceptingRequestExecution.execute(InterceptingClientHttpRequest.java:85) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.http.client.InterceptingClientHttpRequest.executeInternal(InterceptingClientHttpRequest.java:69) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:53) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:619) ~[spring-web-4.3.1.RELEASE.jar:4.3.1.RELEASE] 
    ... 47 more 

प्रश्न:

क्यों अपवाद org.springframework.web.client.ResourceAccessException फेंक दिया जाता है, लेकिन नहीं org.springframework.web.client.HttpClientErrorException, GET अनुरोध से निपटने जब WebApplicationException होता है के लिए क्या हो रहा है?

ResourceAccessException अपवाद तरीकों कि मुझे HTTP स्थिति को पढ़ने के लिए अनुमति देते हैं, नहीं है जैसे getRawStatusCode(), getResponseHeaders(), आदि

Answer 1

क्योंकि यह एक IOException लपेटकर है, वास्तविक प्रतिक्रिया कोड पर नहीं लग रही।

मूल कारण ऐसा प्रतीत होता है क्योंकि BufferingClientHttpResponseWrapper बिना किसी जांच के एक शरीर को पढ़ने की कोशिश कर रहा है।