TOMCAT报这样的错误，请问高手如何解决呢？
原来都没问题的，不知道为什么会出现这个问题，我的项目是struts+hibernate+oracle，现在正在苦恼中，求教

org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.jnu.filters.CheckLoginFilter.doFilter(CheckLoginFilter.java:36)
com.jnu.filters.CloseSessionFilter.doFilter(CloseSessionFilter.java:32)
com.jnu.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:121)


root   cause  

org.apache.jasper.JasperException
org.apache.jasper.compiler.JspConfig.processWebDotXml(JspConfig.java:184)
org.apache.jasper.compiler.JspConfig.init(JspConfig.java:197)
org.apache.jasper.compiler.JspConfig.findJspProperty(JspConfig.java:249)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:112)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:305)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.jnu.filters.CheckLoginFilter.doFilter(CheckLoginFilter.java:36)
com.jnu.filters.CloseSessionFilter.doFilter(CloseSessionFilter.java:32)
com.jnu.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:121)


root   cause  

java.lang.NullPointerException
org.apache.xerces.dom.DeferredDocumentImpl.getNodeExtra(Unknown   Source)
org.apache.xerces.dom.DeferredElementNSImpl.synchronizeData(Unknown   Source)
org.apache.xerces.dom.ElementImpl.getNodeName(Unknown   Source)
org.apache.jasper.xmlparser.ParserUtils.convert(ParserUtils.java:149)
org.apache.jasper.xmlparser.ParserUtils.parseXMLDocument(ParserUtils.java:115)
org.apache.jasper.compiler.JspConfig.processWebDotXml(JspConfig.java:76)
org.apache.jasper.compiler.JspConfig.init(JspConfig.java:197)
org.apache.jasper.compiler.JspConfig.findJspProperty(JspConfig.java:249)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:112)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:305)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
com.jnu.filters.CheckLoginFilter.doFilter(CheckLoginFilter.java:36)
com.jnu.filters.CloseSessionFilter.doF