'JSP - HTTP Status 500 – Internal Server Error

Below is part of my .jsp. 

<%User user = (User) (session.getAttribute("user"));%>
<b>Welcome <%= user.getFirstName() + " " + user.getLastName()%></b>
<br/>

And I am getting below error:

HTTP Status 500 – Internal Server Error

Type Exception Report

Message An exception occurred processing [/home.jsp] at line [20]

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

Exception org.apache.jasper.JasperException: An exception occurred processing [/home.jsp] at line [20]

17: This is added information page
18: <%=new Date()%> 19: <%User user = (User) (session.getAttribute("user"));%> 20: Welcome <%= user.getFirstName() + " " + user.getLastName()%> 21:
22: 23: Logout

Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:593) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:482) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

Root Cause java.lang.NullPointerException org.apache.jsp.home_jsp._jspService(home_jsp.java:139) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:444) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) 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/9.0.1

Can someone pls help? Error is on line 20.

jsp


Solution 1:[1]

NullPointerException is thrown because the variable user ( = session.getAttribute("user")) is null.

You should add if (user != null) { ... at least.

Solution 2:[2]

Make Sure you have created Session and set variable as same as

session.getAttribute("user");

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Kohei TAMURA
Solution 2 Karan shah

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