tomcat 3.2.2 session already invalidated-serious problem

[Its Me.. Karthik]

Hi,

 im usuing tomcat 3.2.1..when i invalidate my session im getting error..

this is my piece of code

if(monitor.containsKey(uname)){

  HttpSession oldSession = (HttpSession)monitor.get(uname);

  oldSession.invalidate();

}

the error is

 

Internal Servlet Error:

javax.servlet.ServletException: setAttribute: Session already invalidated
	at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:459)
	at karthik._0002fkarthik_0002fpage_00031_0002ejsppage1_jsp_2._jspService(_0002fkarthik_0002fpage_00031_0002ejsppage1_jsp_2.java:129)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServlet.java:130)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:282)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
	at org.apache.tomcat.core.Handler.service(Handler.java:287)
	at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
	at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
	at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
	at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
	at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
	at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
	at java.lang.Thread.run(Thread.java:484)

Root cause:

java.lang.IllegalStateException: setAttribute: Session already invalidated
	at org.apache.tomcat.session.StandardSession.setAttribute(StandardSession.java:721)
	at karthik._0002fkarthik_0002fpage_00031_0002ejsppage1_jsp_2._jspService(_0002fkarthik_0002fpage_00031_0002ejsppage1_jsp_2.java:111)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.jasper.servlet.JspServlet$JspCountedServlet.service(JspServlet.java:130)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:282)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:429)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:500)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
	at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:405)
	at org.apache.tomcat.core.Handler.service(Handler.java:287)
	at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
	at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797)
	at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
	at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
	at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
	at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
	at java.lang.Thread.run(Thread.java:484)

 
please help me..very urgent
karthik

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