HTTP Status 500 – Internal Server Error


Type Exception Report

Message An exception occurred processing [print/allexams.jsp] at line [32]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.apache.jasper.JasperException: An exception occurred processing [print/allexams.jsp] at line [32]

29: while(rs.next()){dates[td]=rs.getString(1);dates1[td]=rs.getString(2);day[td]=rs.getString(3);ss[td++]=rs.getInt(4);}
30: 
31: 
32: %>
33: <html><head><title>all exams</title><meta charset="UTF-8">
34: <meta name="viewport" content="width=device-width, minimum-scale=1.0, maximum-scale=1.0" />
35: <meta name="apple-mobile-web-app-capable" content="yes" />


Stacktrace:
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:610)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:499)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328)
	jakarta.servlet.http.HttpServlet.service(HttpServlet.java:792)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

Root Cause

java.lang.NullPointerException: Cannot invoke "Object.toString()" because the return value of "jakarta.servlet.http.HttpSession.getAttribute(String)" is null
	org.apache.jsp.print.allexams_jsp._jspService(allexams_jsp.java:249)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	jakarta.servlet.http.HttpServlet.service(HttpServlet.java:792)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:380)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:328)
	jakarta.servlet.http.HttpServlet.service(HttpServlet.java:792)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

Note The full stack trace of the root cause is available in the server logs.


Apache Tomcat/10.0.27