Connection reset问题

在日志中有很多这种异常,是什么原因造成的?2005-12-19 10:36:30 ErrorDispatcherValve[localhost]: Remote Client Aborted Request, IOException: Connection reset
2005-12-19 10:37:06 StandardWrapperValve[default]: Servlet.service() for servlet default threw exception
ClientAbortException:  java.net.SocketException: Connection reset
        at org.apache.coyote.tomcat4.OutputBuffer.realWriteBytes(OutputBuffer.java:410)
        at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:436)
        at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:356)
        at org.apache.coyote.tomcat4.OutputBuffer.writeBytes(OutputBuffer.java:438)
        at org.apache.coyote.tomcat4.OutputBuffer.write(OutputBuffer.java:425)
        at org.apache.coyote.tomcat4.CoyoteOutputStream.write(CoyoteOutputStream.java:108)
        at org.apache.catalina.servlets.DefaultServlet.copyRange(DefaultServlet.java:2014)
        at org.apache.catalina.servlets.DefaultServlet.copy(DefaultServlet.java:1763)
        at org.apache.catalina.servlets.DefaultServlet.serveResource(DefaultServlet.java:1091)
        at org.apache.catalina.servlets.DefaultServlet.doGet(DefaultServlet.java:518)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2422)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:163)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
        at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
        at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:199)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:828)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:700)
        at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:584)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
        at java.lang.Thread.run(Thread.java:534)