java - DWR调用在IE8中抛出 "Failed to read input"，出现太频繁

Question

此问题仅在 IE8 中出现，在浏览器上它抛出 http 502 错误，而在 apache 中它抛出 http 103 & 我的应用程序由于这个错误而中断

在 dwr jar 中添加 sysout 后，我​​得到了以下日志:

    DWR Exception in ParsePost Data Failed to read input
    java.io.IOException: Underlying input stream returned zero bytes
        at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:268)
        at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306)
        at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158)
        at java.io.InputStreamReader.read(InputStreamReader.java:167)
        at java.io.BufferedReader.fill(BufferedReader.java:136)
        at java.io.BufferedReader.readLine(BufferedReader.java:299)
        at java.io.BufferedReader.readLine(BufferedReader.java:362)
        at org.directwebremoting.dwrp.ParseUtil.parsePost(ParseUtil.java:65)
        at org.directwebremoting.dwrp.Batch.<init>(Batch.java:58)
        at org.directwebremoting.dwrp.BaseCallMarshaller.marshallInbound(BaseCallMarshaller.java:76)
        at org.directwebremoting.servlet.PlainCallHandler.handle(PlainCallHandler.java:42)
        at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)
        at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:146)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.zycus.icontract.common.IContractSessionValidationOpenXavaFilter.doFilter(IContractSessionValidationOpenXavaFilter.java:66)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
        at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
    DWR Excpetion in MarshallInbound 
    org.directwebremoting.extend.ServerException: Failed to read input
        at org.directwebremoting.dwrp.ParseUtil.parsePost(ParseUtil.java:110)
        at org.directwebremoting.dwrp.Batch.<init>(Batch.java:58)
        at org.directwebremoting.dwrp.BaseCallMarshaller.marshallInbound(BaseCallMarshaller.java:76)
        at org.directwebremoting.servlet.PlainCallHandler.handle(PlainCallHandler.java:42)
        at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)
        at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:146)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at com.zycus.icontract.common.IContractSessionValidationOpenXavaFilter.doFilter(IContractSessionValidationOpenXavaFilter.java:66)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
        at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:200)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539)
        at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
    Caused by: java.io.IOException: Underlying input stream returned zero bytes
        at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:268)
        at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306)
        at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158)
        at java.io.InputStreamReader.read(InputStreamReader.java:167)
        at java.io.BufferedReader.fill(BufferedReader.java:136)
        at java.io.BufferedReader.readLine(BufferedReader.java:299)
        at java.io.BufferedReader.readLine(BufferedReader.java:362)
        at org.directwebremoting.dwrp.ParseUtil.parsePost(ParseUtil.java:65)
        ... 25 more

Inside marshallException
Exiting from marshallException
Returning from PlainCallHandler

我发现上述问题的解决方案很少:

1)在apache中增加keepAliveTimout

2)更改dwr jar的ParseUtil类中读取输入的方式来自

BufferedReader in = new BufferedReader(new InputStreamReader(req.getInputStream()));

到

BufferedReader in = req.getReader();

但是问题在IE8

中仍然可以重现

我还尝试在发生此异常但未发出警报时发出警报消息 “内部服务器错误。请重试”。我对 dwr-engine.js 进行了更改以显示警报消息

Answer 1

1)增加apache中的keepAliveTimout

2)更改dwr jar的ParseUtil类中读取输入的方式