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java.lang.NullPointerException: 	at org.apache.jsp.list$jsp._jspService(list$jsp.java:99)	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:202)	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382)	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474)	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:243)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2343)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)	at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)	at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1012)	at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1107)	at java.lang.Thread.run(Thread.java:539)