javax.servlet.ServletException: can't remove Attributes from request scope

[Guy Roberts]

Gudday all,

I want to deploy my struts application on a friend's apache/tomcat (version 3.2 
Tomcat).  Everything works fine on my localhost using Tomcat 4.0, but on his machine 
the demo application called struts-example throws an exception (see below) when I try 
to log on.

I know that a similar problem to this has been posted to this list before ("RE: Struts 
1.0 on WebSphere 3.5.4??" by Chris Assenza) and I have tried the fix suggested then 
(to change the doEndTag() method of FormTag.java but to no avail.

Thanks for any ideas,

Guy Roberts, 

Nottingham.



Internal Servlet Error:

javax.servlet.ServletException: cant remove Attributes from request scope
        at 
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:453)
        at 
_0002flogon_0002ejsplogon_jsp_0._jspService(_0002flogon_0002ejsplogon_jsp_0.java:393)
        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$JspServletWrapper.service(JspServlet.java:177)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
        at org.apache.tomcat.core.Handler.service(Handler.java:286)
        at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at 
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:799)
        at org.apache.tomcat.core.ContextManager.service(ContextManager.java:745)
        at 
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
        at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:407)
        at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
        at java.lang.Thread.run(Thread.java:484)

Root cause: 
java.lang.IllegalArgumentException: cant remove Attributes from request scope
        at 
org.apache.jasper.runtime.PageContextImpl.removeAttribute(PageContextImpl.java:289)
        at org.apache.struts.taglib.html.FormTag.doEndTag(FormTag.java:591)
        at 
_0002flogon_0002ejsplogon_jsp_0._jspService(_0002flogon_0002ejsplogon_jsp_0.java:368)
        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$JspServletWrapper.service(JspServlet.java:177)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
        at org.apache.tomcat.core.Handler.service(Handler.java:286)
        at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
        at 
org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:799)
        at org.apache.tomcat.core.ContextManager.service(ContextManager.java:745)
        at 
org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210)
        at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:407)
        at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
        at java.lang.Thread.run(Thread.java:484)