Please check the code of Logout.jsp for errors:

			

			<%@ page import="beans.*, java.util.HashMap"  %>
			

			<%
			

			if(session !=null){
			

			User user=(User)session.getValue("user");
			

			if(user!=null){
			

			HashMap hash=(HashMap)application.getAttribute("monitor");
			

			hash.remove(user);
			

			session.invalidate();
			

			}
			

			}
			

			%>
			

			

			

			
You have successfully signout
			

			SignIn
			

			

			

			

		

Here is the error it's showing

			

			Error: 500
			

			Location: /examples/jsp/library/signout.jsp
			

			Internal Servlet Error:
			

			

			javax.servlet.ServletException
			

			at org.apache.jasper.runtime.PageContextImpl.handlePageException(Unknown Source)
			

			at jsp.library.signout_1._jspService(signout_1.java:78)
			

			at org.apache.jasper.runtime.HttpJspBase.service(Unknown Source)
			

			at javax.servlet.http.HttpServlet.service(HttpServlet.java)
			

			at org.apache.tomcat.facade.ServletHandler.doService(Unknown Source)
			

			at org.apache.tomcat.core.Handler.invoke(Unknown Source)
			

			at org.apache.tomcat.core.Handler.service(Unknown Source)
			

			at org.apache.tomcat.facade.ServletHandler.service(Unknown Source)
			

			at org.apache.tomcat.core.ContextManager.internalService(Unknown Source)
			

			at org.apache.tomcat.core.ContextManager.service(Unknown Source)
			

			at org.apache.tomcat.modules.server.Http10Interceptor.processConnection(Unknown Source)
			

			at org.apache.tomcat.util.net.TcpWorkerThread.runIt(Unknown Source)
			

			at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(Unknown Source)
			

			at java.lang.Thread.run(Thread.java:484)
			

			Root cause:
			

			java.lang.NullPointerException
			

			at jsp.library.signout_1._jspService(signout_1.java:65)
			

			at org.apache.jasper.runtime.HttpJspBase.service(Unknown Source)
			

			at javax.servlet.http.HttpServlet.service(HttpServlet.java)
			

			at org.apache.tomcat.facade.ServletHandler.doService(Unknown Source)
			

			at org.apache.tomcat.core.Handler.invoke(Unknown Source)
			

			at org.apache.tomcat.core.Handler.service(Unknown Source)
			

			at org.apache.tomcat.facade.ServletHandler.service(Unknown Source)
			

			at org.apache.tomcat.core.ContextManager.internalService(Unknown Source)
			

			at org.apache.tomcat.core.ContextManager.service(Unknown Source)
			

			at org.apache.tomcat.modules.server.Http10Interceptor.processConnection(Unknown Source)
			

			at org.apache.tomcat.util.net.TcpWorkerThread.runIt(Unknown Source)
			

			at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(Unknown Source)
			

			at java.lang.Thread.run(Thread.java:484
			

			

		

Thanks