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我在一堆Linux服务器上设置自动Cron作业，这需要调用IBM WebSphere Application Server提供的一些PUT/POST API （8.5.5）。我用Java编写了自己的REST客户端，但奇怪的是，有时API执行会挂起下面的异常。当有效负载超过特定大小时，Java REST API调用失败，异常“异步操作超时”
com.ibm.ws.webcontainer.webapp.WebApp logServletError SRVE0293E: [Servlet Error]-[JAX-RS Servlet]: java.net.SocketTimeoutException: Async operation timed out
at com.ibm.ws.tcp.channel.impl.AioTCPReadRequestContextImpl.processSyncReadRequest(AioTCPReadRequestContextImpl.java:191)
at com.ibm.ws.tcp.channel.impl.TCPReadRequestContextImpl.read(TCPReadRequestContextImpl.java:111)
at com.ibm.ws.http.channel.impl.HttpServiceContextImpl.fillABuffer(HttpServiceContextImpl.java:4212)
at com.ibm.ws.http.channel.impl.HttpServiceContextImpl.readSingleBlock(HttpServiceContextImpl.java:3440)
at com.ibm.ws.http.channel.impl.HttpServiceContextImpl.readBodyBuffer(HttpServiceContextImpl.java:3546)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundServiceContextImpl.getRequestBodyBuffer(HttpInboundServiceContextImpl.java:1822)
at com.ibm.ws.webcontainer.channel.WCCByteBufferInputStream.bufferIsGood(WCCByteBufferInputStream.java:371)
at com.ibm.ws.webcontainer.channel.WCCByteBufferInputStream.read(WCCByteBufferInputStream.java:265)
at com.ibm.ws.webcontainer.srt.http.HttpInputStream.read(HttpInputStream.java:322)
at sun.nio.cs.StreamDecoder$CharsetSD.readBytes(StreamDecoder.java:464)
at sun.nio.cs.StreamDecoder$CharsetSD.implRead(StreamDecoder.java:506)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:234)
at java.io.InputStreamReader.read(InputStreamReader.java:188)
at com.ibm.json.java.JSONArray.parse(JSONArray.java:150)
at com.ibm.websphere.jaxrs.providers.json4j.JSON4JArrayProvider.readFrom(JSON4JArrayProvider.java:44)
at com.ibm.websphere.jaxrs.providers.json4j.JSON4JArrayProvider.readFrom(JSON4JArrayProvider.java:25)
at org.apache.wink.server.internal.registry.ServerInjectableFactory$EntityParam.getValue(ServerInjectableFactory.java:197)
at org.apache.wink.common.internal.registry.InjectableFactory.instantiate(InjectableFactory.java:68)
at org.apache.wink.server.internal.handlers.CreateInvocationParametersHandler.handleRequest(CreateInvocationParametersHandler.java:44)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleSubResourceMethod(FindResourceMethodHandler.java:188)
at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleRequest(FindResourceMethodHandler.java:110)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.handlers.FindRootResourceHandler.handleRequest(FindRootResourceHandler.java:95)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.handlers.HeadMethodHandler.handleRequest(HeadMethodHandler.java:53)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.handlers.OptionsMethodWADLHandler.handleRequest(OptionsMethodWADLHandler.java:51)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.handlers.SearchResultHandler.handleRequest(SearchResultHandler.java:33)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.log.ResourceInvocation.handleRequest(ResourceInvocation.java:92)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.log.Requests.handleRequest(Requests.java:76)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.handlers.AbstractHandlersChain.run(AbstractHandlersChain.java:60)
at org.apache.wink.server.internal.RequestProcessor.handleRequestWithoutFaultBarrier(RequestProcessor.java:207)
at org.apache.wink.server.internal.RequestProcessor.handleRequest(RequestProcessor.java:154)
at org.apache.wink.server.internal.servlet.RestServlet.service(RestServlet.java:124)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1230)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:779)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:478)
at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:178)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1071)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:87)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:909)
at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1662)
at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:200)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:459)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:526)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:312)
at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:283)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)
at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1862)
Caused by: com.ibm.io.async.AsyncTimeoutException(Async operation timed out, [Timeout, rc=0])
at com.ibm.io.async.AbstractAsyncFuture.waitForCompletion(AbstractAsyncFuture.java:359)
at com.ibm.io.async.AsyncFuture.getByteCount(AsyncFuture.java:218)
at com.ibm.ws.tcp.channel.impl.AioSocketIOChannel.readAIOSync(AioSocketIOChannel.java:215)
at com.ibm.ws.tcp.channel.impl.AioTCPReadRequestContextImpl.processSyncReadRequest(AioTCPReadRequestContextImpl.java:184)
... 78 more
这只发生在一些Linux服务器上，当我在Windows工作站上开发它时它工作得很好。所以在WAS服务器中设置超时应该不成问题。我尝试使用卷曲如下
curl -vX PUT http://<was_server_ip>:9081/RTCWebClient/v0.1/api/testResult/syncTestSuites?testCategory=Kitchen -d @test.json --header "Content-Type: application/json"
调试，发现当所述有效载荷超过1306个字节（见下文卷曲输出内容长度），该API开始挂并给出上述异常。
> PUT /RTCWebClient/v0.1/api/testResult/syncTestSuites?testCategory=Kitchen
HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: 9.51.163.190:9081
> Accept: */*
> Content-Type: application/json
> Content-Length: 1307
> Expect: 100-continue
>
< HTTP/1.1 100 Continue
< Content-Length: 0
< Date: Wed, 24 Aug 2016 07:35:23 GMT
< HTTP/1.1 500 Internal Server Error
< Date: Wed, 24 Aug 2016 07:35:23 GMT
< X-Powered-By: Servlet/3.0
< Content-Type: text/html;charset=ISO-8859-1
< $WSEP:
< Content-Language: en-US
< Content-Length: 102
< Connection: Close
<
Error 500: javax.servlet.ServletException: java.net.SocketTimeoutException: Async operation timed out
* Closing connection #0
当有效负载小于1307字节时，API得到正确执行。
> PUT /RTCWebClient/v0.1/api/testResult/syncTestSuites?testCategory=Kitchen HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: 9.51.163.190:9081
> Accept: */*
> Content-Type: application/json
> Content-Length: 1306
> Expect: 100-continue
>
< HTTP/1.1 100 Continue
< Content-Length: 0
< Date: Wed, 24 Aug 2016 07:37:51 GMT
< HTTP/1.1 200 OK
< Date: Wed, 24 Aug 2016 07:37:51 GMT
< X-Powered-By: Servlet/3.0
< Content-Type: application/json
< Access-Control-Allow-Headers: application/json
< Access-Control-Allow-Methods: GET, POST, PUT, DELETE
< Access-Control-Allow-Origin: *
< Content-Language: en-US
< Transfer-Encoding: chunked
<
* Connection #0 to host 9.51.163.190 left intact
* Closing connection #0
{"Identifier":"syncTestSuites completed","Result":{"Newly Added Test Suites":[]}}
我需要与他们的管理员检查在那些有问题的Linux机器上可能导致这种情况的设置。但我也在这里发布，看看是否有人能够就这个问题给出一些深思熟虑的见解。
一些相关的Stack问题尚未解答。 1. [异步操作超时]（http://stackoverflow.com/questions/35476406/async-operation-timed-out）2. [请求没有得到正确提交]（http://stackoverflow.com/questions/ 36810130/request-is-not-getting-submitted-properly -ww-gettingexception-java-net-sockett） –
我怀疑“异步操作超时”是WebSphere的方式：“我没有得到响应”。但奇怪的是，这取决于消息的大小，它不像你发送兆字节。它可能需要使用pcap或wireshark来查看通信发生了什么以达到此目的。 –