Hi,
In this case you do one thing, if the user clicks on the link you call a
jsp , inside that jsp , you do the coding for invalidating the session,
session.invalidate().
AK Jothi
Verchaska
----- Original Message -----
From: Chin Sung Kit <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, October 23, 2000 12:39 PM
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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Some relevant FAQs on JSP/Servlets can be found at:
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http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
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