把我的问题提示贴出来，大家帮我看看：java.lang.NullPointerException
at com.cvicse.jsps.post$jsp._jspService(post$jsp.java:254)
at com.cvicse.jspc.runtime.HttpJspBase.service(HttpJspBase.java:50)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.cvicse.jspc.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:137)
at com.cvicse.jspc.servlet.JspServlet.serviceJspFile(JspServlet.java:317)
at com.cvicse.jspc.servlet.JspServlet.service(JspServlet.java:409)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.cvicse.inforweb.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:177)
at com.cvicse.inforweb.core.ApplicationFilterChain.access$0(ApplicationFilterChain.java:127)
at com.cvicse.inforweb.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:106)
at java.security.AccessController.doPrivileged(Native Method)
at com.cvicse.inforweb.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:102)
at com.cvicse.inforweb.filters.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:105)
at com.cvicse.inforweb.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:143)
at com.cvicse.inforweb.core.ApplicationFilterChain.access$0(ApplicationFilterChain.java:127)
at com.cvicse.inforweb.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:106)
at java.security.AccessController.doPrivileged(Native Method)
at com.cvicse.inforweb.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:102)
at com.cvicse.inforweb.core.StandardWrapperValve.invoke(StandardWrapperValve.java:176)
at com.cvicse.inforweb.core.StandardPipeline.invokeNext(StandardPipeline.java:494)
at com.cvicse.inforweb.core.StandardPipeline.invoke(StandardPipeline.java:400)
at com.cvicse.inforweb.core.ContainerBase.invoke(ContainerBase.java:823)
at com.cvicse.inforweb.core.StandardContextValve.invoke(StandardContextValve.java:120)
at com.cvicse.inforweb.core.StandardPipeline.invokeNext(StandardPipeline.java:494)
at com.cvicse.inforweb.valves.CertificatesValve.invoke(CertificatesValve.java:162)
at com.cvicse.inforweb.core.StandardPipeline.invokeNext(StandardPipeline.java:492)
at com.cvicse.inforweb.core.StandardPipeline.invoke(StandardPipeline.java:400)
at com.cvicse.inforweb.core.ContainerBase.invoke(ContainerBase.java:823)
at com.cvicse.inforweb.core.StandardContext.invoke(StandardContext.java:2280)
at com.cvicse.inforweb.core.StandardHostValve.invoke(StandardHostValve.java:110)
at com.cvicse.inforweb.core.StandardPipeline.invokeNext(StandardPipeline.java:494)
at com.cvicse.inforweb.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:97)
at com.cvicse.inforweb.core.StandardPipeline.invokeNext(StandardPipeline.java:492)
at com.cvicse.inforweb.valves.ErrorReportValve.invoke(ErrorReportValve.java:96)
at com.cvicse.inforweb.core.StandardPipeline.invokeNext(StandardPipeline.java:492)
at com.cvicse.inforweb.authenticator.SingleSignOn.invoke(SingleSignOn.java:288)
at com.cvicse.inforweb.core.StandardPipeline.invokeNext(StandardPipeline.java:492)
at com.cvicse.inforweb.core.StandardPipeline.invoke(StandardPipeline.java:400)
at com.cvicse.inforweb.core.ContainerBase.invoke(ContainerBase.java:823)
at com.cvicse.inforweb.core.StandardEngineValve.invoke(StandardEngineValve.java:104)
at com.cvicse.inforweb.core.StandardPipeline.invokeNext(StandardPipeline.java:494)
at com.cvicse.inforweb.valves.AccessLogValve.invoke(AccessLogValve.java:367)
at com.cvicse.inforweb.core.StandardPipeline.invokeNext(StandardPipeline.java:492)
at com.cvicse.inforweb.core.StandardPipeline.invoke(StandardPipeline.java:400)
at com.cvicse.inforweb.core.ContainerBase.invoke(ContainerBase.java:823)
at com.cvicse.inforweb.connector.http.HttpProcessor.process(HttpProcessor.java:942)
at com.cvicse.inforweb.connector.http.HttpProcessor.run(HttpProcessor.java:1037)
at java.lang.Thread.run(Thread.java:536)
