Hi All,
I am a relative newcomer to Tomcat and Java and I would really appreciate if a 
few of you could check my
reasoning here in trying to understand this exception. I am running the 
following:

Tomcat 4.1
Apache/1.3.33 (Win32) 
mod_jk/1.2.8 
JRE Version 1.4.2_03

About every hour or so on the live web app I get the following stack trace 
logged to the Tomcat context logger 
(Tomcat doesn't hang) 


008-04-22 09:06:06 ApplicationDispatcher[] Servlet.service() for servlet jsp 
threw exception
org.apache.jasper.JasperException
 at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:207)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
 at 
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:627)
 at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:382)
 at 
org.apache.catalina.core.ApplicationDispatcher.access$000(ApplicationDispatcher.java:66)
 at 
org.apache.catalina.core.ApplicationDispatcher$PrivilegedForward.run(ApplicationDispatcher.java:81)
 at java.security.AccessController.doPrivileged(Native Method)
 at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:298)
 at 
my.domain.opentools.ServPublicAreaController.gotoPage(ServPublicAreaController.java:686)
 at 
my.domain.opentools.ServPublicAreaController.doLogin(ServPublicAreaController.java:177)
 at 
my.domain.opentools.ServPublicAreaController.service(ServPublicAreaController.java:103)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
 at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
 at 
org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:51)
 at 
org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:129)
 at java.security.AccessController.doPrivileged(Native Method)
 at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:125)
 at org.securityfilter.filter.SecurityFilter.doFilter(SecurityFilter.java:188)
 at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
 at 
org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:51)
 at 
org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:129)
 at java.security.AccessController.doPrivileged(Native Method)
 at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:125)
 at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
 at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
 at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
 at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
 at 
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
 at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
 at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
 at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
 at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:300)
 at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:374)
 at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:743)
 at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:675)
 at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:866)
 at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
 at java.lang.Thread.run(Thread.java:536)
----- Root Cause -----
java.lang.IllegalStateException
 at 
org.apache.coyote.tomcat4.CoyoteResponseFacade.sendRedirect(CoyoteResponseFacade.java:290)
 at org.apache.jsp.login_jsp._jspService(login_jsp.java:102)
 at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:92)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
 at 
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:162)
 at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
 at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
 at 
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:627)
 at 
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:382)
 at 
org.apache.catalina.core.ApplicationDispatcher.access$000(ApplicationDispatcher.java:66)
 at 
org.apache.catalina.core.ApplicationDispatcher$PrivilegedForward.run(ApplicationDispatcher.java:81)
 at java.security.AccessController.doPrivileged(Native Method)
 at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:298)
 at 
my.domain.opentools.ServPublicAreaController.gotoPage(ServPublicAreaController.java:686)
 at 
my.domain.opentools.ServPublicAreaController.doLogin(ServPublicAreaController.java:177)
 at 
my.domain.opentools.ServPublicAreaController.service(ServPublicAreaController.java:103)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
 at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
 at 
org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:51)
 at 
org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:129)
 at java.security.AccessController.doPrivileged(Native Method)
 at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:125)
 at org.securityfilter.filter.SecurityFilter.doFilter(SecurityFilter.java:188)
 at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:166)
 at 
org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:51)
 at 
org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:129)
 at java.security.AccessController.doPrivileged(Native Method)
 at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:125)
 at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
 at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
 at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
 at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
 at 
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
 at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
 at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
 at 
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
 at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
 at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
 at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
 at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:300)
 at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:374)
 at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:743)
 at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:675)
 at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:866)
 at 
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
 at java.lang.Thread.run(Thread.java:536)




Am I right in saying the following? :

1) These are the the most important entries in the stack trace

----- Root Cause -----
java.lang.IllegalStateException
 at 
org.apache.coyote.tomcat4.CoyoteResponseFacade.sendRedirect(CoyoteResponseFacade.java:290)
 at org.apache.jsp.login_jsp._jspService(login_jsp.java:102)


2) These are the lines from login_jsp.java taken from the /work directory in 
Tomcat


101> if(sessionNew) {
102> response.sendRedirect(url_userServletMain);
103> }

So there is a problem with sendRedirect or the parameter url_userServletMain


3) Can anyone tell me if these lines are important or not?

 at 
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:298)
 at 
my.domain.opentools.ServPublicAreaController.gotoPage(ServPublicAreaController.java:686)
 at 
my.domain.opentools.ServPublicAreaController.doLogin(ServPublicAreaController.java:177)
 at 
my.domain.opentools.ServPublicAreaController.service(ServPublicAreaController.java:103)


Many thanks in advance,
Jonathan.

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