编程之惑-客户端关闭服务器出现异常的现象。

xiaoxiao2021-02-28  6

技术介绍:javaweb项目,使用weblogic。

现象:项目中集成异常机制,系统有异常立刻发送邮件到开发人员手上。最近经常有异常发生(虽然不影响使用),并且内容

为:

at java.net.SocketOutputStream.socketWrite0(Native Method) at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:113) at java.net.SocketOutputStream.write(SocketOutputStream.java:159) at weblogic.servlet.internal.ChunkOutput.writeChunkTransfer(ChunkOutput.java:568) at weblogic.servlet.internal.ChunkOutput.writeChunks(ChunkOutput.java:539) at weblogic.servlet.internal.ChunkOutput.flush(ChunkOutput.java:427) at weblogic.servlet.internal.ChunkOutput$2.checkForFlush(ChunkOutput.java:648) at weblogic.servlet.internal.ChunkOutput.write(ChunkOutput.java:333) at weblogic.servlet.internal.ChunkOutputWrapper.write(ChunkOutputWrapper.java:148) at weblogic.servlet.internal.ServletOutputStreamImpl.write(ServletOutputStreamImpl.java:148) at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221) at sun.nio.cs.StreamEncoder.implWrite(StreamEncoder.java:282) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:125) at sun.nio.cs.StreamEncoder.write(StreamEncoder.java:135) at java.io.OutputStreamWriter.write(OutputStreamWriter.java:220) at java.io.Writer.write(Writer.java:157) at org.springframework.util.StreamUtils.copy(StreamUtils.java:105) at org.springframework.http.converter.StringHttpMessageConverter.writeInternal(StringHttpMessageConverter.java:106) at org.springframework.http.converter.StringHttpMessageConverter.writeInternal(StringHttpMessageConverter.java:40) at org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:207) at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:148) at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:90) at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:193) at org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:71) at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:122) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749) at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:690) at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) at javax.servlet.http.HttpServlet.service(HttpServlet.java:820) at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227) at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125) at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301) at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56) at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123) at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3730) at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696) at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321) at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120) at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2273) at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179) at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490) at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256) at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)代码中不涉及具体业务代码块,可以观察到是关于socket。通过谷歌查明是因为客户端发出请求不等服务端响应就关闭了网站而产生,正好报表数据很多有些查询比较费时大概在6-10s中(如果查询好几年的数据的话),猜想查询速度太慢用户关闭系统。然后测试了下没等数据返回回来就关闭网站系统果然立刻发出异常到邮箱上。

目前异常发生原因已发现,没有比较好的解决方法(虽然此异常没什么危害)。

目前我在系统异常集中处理代码块做了个判断,只要是这块的异常不发送邮件。

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