请教一个spring mvc的问题

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请教一个spring mvc的问题5

我项目用的spring mvc框架，加了一个filter处理字符，偶尔会报空指针，不知道什么情况引起的，下面是错误。

netYntnm[ERROR] 2012-11-02 15:02:20 "null{
com.yxl.util.spring.SpringExceptionHandle@9e260c
     at org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:319)
     at org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:288)
     at org.apache.catalina.connector.CoyoteOutputStream.flush(CoyoteOutputStream.java:98)
     at org.springframework.util.FileCopyUtils.copy(FileCopyUtils.java:116)
     at org.springframework.web.servlet.resource.ResourceHttpRequestHandler.writeContent(ResourceHttpRequestHandler.java:210)
     at org.springframework.web.servlet.resource.ResourceHttpRequestHandler.handleRequest(ResourceHttpRequestHandler.java:135)
     at org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter.handle(HttpRequestHandlerAdapter.java:49)
     at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
     at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
     at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
     at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
     at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at com.yxl.util.security.xss.XssFilter.doFilter(XssFilter.java:26)
     at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
     at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
     at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
     at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
     at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
     at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
     at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
     at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
     at java.lang.Thread.run(Thread.java:662)
}" ------> com.yxl.util.spring.SpringExceptionHandle[http-8080-9]