Based on the root cause NullPointerException, I'd say the session doesn't
actually exist itself. Try including a check for that as well.
-----Original Message-----
From: Chin Sung Kit [mailto:[EMAIL PROTECTED]]
Sent: Monday, October 23, 2000 9:10 AM
To: [EMAIL PROTECTED]
Subject: help,invalidate session
hi,
i have a problem invalidating the user's session.
i have a <a href> link, if the user clicks on this link, it is supposed
to sign out the user - HttpSession.invalidate();
my jsp code:
<%
String signout = request.getParameter("signout");
if (signout != null)
userSession.invalidate();
%>
i'm using tomcat3.1
thanks for any help/suggestion.
ced
below is the error:
Internal Servlet Error:
javax.servlet.ServletException:
at
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImp
l.java:386)
at
jsp._0002fjsp_0002fsignin_0002ejspsignin_jsp_23._jspService(_0002fjsp_0002fs
ignin_0002ejspsignin_jsp_23.java:149)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java, Compiled
Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java,
Compiled Code)
at
org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.ja
va,
Compiled Code)
at
org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java,
Compiled Code)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java,
Compiled Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java,
Compiled Code)
at
org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java,
Compiled Code)
at
org.apache.tomcat.core.ContextManager.service(ContextManager.java,
Compiled Code)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpC
onnectionHandler.java,
Compiled Code)
at
org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java,
Compiled Code)
at java.lang.Thread.run(Unknown Source)
Root cause:
java.lang.NullPointerException:
at
jsp._0002fjsp_0002fsignin_0002ejspsignin_jsp_23._jspService(_0002fjsp_0002fs
ignin_0002ejspsignin_jsp_23.java:136)
at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java, Compiled
Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java,
Compiled Code)
at
org.apache.jasper.runtime.JspServlet$JspServletWrapper.service(JspServlet.ja
va,
Compiled Code)
at
org.apache.jasper.runtime.JspServlet.serviceJspFile(JspServlet.java,
Compiled Code)
at org.apache.jasper.runtime.JspServlet.service(JspServlet.java,
Compiled Code)
at javax.servlet.http.HttpServlet.service(HttpServlet.java,
Compiled Code)
at
org.apache.tomcat.core.ServletWrapper.handleRequest(ServletWrapper.java,
Compiled Code)
at
org.apache.tomcat.core.ContextManager.service(ContextManager.java,
Compiled Code)
at
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpC
onnectionHandler.java,
Compiled Code)
at
org.apache.tomcat.service.TcpConnectionThread.run(SimpleTcpEndpoint.java,
Compiled Code)
at java.lang.Thread.run(Unknown Source)
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