Error: 500

Location: /mainpage.jsp

Internal Servlet Error:
javax.servlet.ServletException
	at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:461)
	at _0002fmainpage_0002ejspmainpage_jsp_21._jspService(_0002fmainpage_0002ejspmainpage_jsp_21.java:5394)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServlet.java:130)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:282)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
	at org.apache.tomcat.core.Handler.service(Handler.java:287)
	at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
	at org.apache.tomcat.facade.RequestDispatcherImpl.doForward(RequestDispatcherImpl.java:222)
	at org.apache.tomcat.facade.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:162)
	at MainServlet.doGet(MainServlet.java:171)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
	at org.apache.tomcat.core.Handler.service(Handler.java:287)
	at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
	at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:806)
	at org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
	at org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnection(Ajp13ConnectionHandler.java:160)
	at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
	at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
	at java.lang.Thread.run(Thread.java:785)
Root cause:
java.lang.NullPointerException
	at _0002fmainpage_0002ejspmainpage_jsp_21._jspService(_0002fmainpage_0002ejspmainpage_jsp_21.java:1018)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServlet.java:130)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:282)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
	at org.apache.tomcat.core.Handler.service(Handler.java:287)
	at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
	at org.apache.tomcat.facade.RequestDispatcherImpl.doForward(RequestDispatcherImpl.java:222)
	at org.apache.tomcat.facade.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:162)
	at MainServlet.doGet(MainServlet.java:171)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
	at org.apache.tomcat.core.Handler.service(Handler.java:287)
	at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
	at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:806)
	at org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
	at org.apache.tomcat.service.connector.Ajp13ConnectionHandler.processConnection(Ajp13ConnectionHandler.java:160)
	at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
	at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
	at java.lang.Thread.run(Thread.java:785)