Servlet won't run under JRun 4.0

Question

Problem> when I attempt to run a successfully compiled servlet in IE, IE
could not locate the page. IE displays "Oops! We couldn't find your
document.", or a window with caption/title "HTTP 500 Internal server
error" and message "The page cannot be displayed. There is a problem
with the page you are trying to reach and it cannot be displayed."
The servlet is stored in C:\JRun4\servers\default\default-ear\default-
war\WEB-INF\classes\Servlet_Class1.class. The 'default' server was
running (via jrun -start default).
The following are the URLs I used in an attempt to run the servlet:
http://localhost:8100/Servlet_Class1
http://localhost:8100/servlet/Servlet_Class1
http://localhost:8100/default/servlet/Servlet_Class1
http://localhost:8100/classes/Servlet_Class1
http://localhost:8100/default/classes/Servlet_Class1
I entered the following servlet definition in
C:\JRun4\servers\default\default-ear\default-war\WEB-INF\web.xml:
     <servlet>
          <servlet-name>Servlet_Class1</servlet-name>
          <servlet-class>Servlet_Class1</servlet-class>
     </servlet>
I defined url pattern in web.xml:
     <servlet-mapping>
          <servlet-name>Servlet_Class1</servlet-name>
          <url-pattern>/</url-pattern>
     </servlet-mapping>
Here is a portion of the servlet I'm attempting to run:
     import javax.servlet.*;
     import javax.servlet.http.*;
     import java.io.*;
     /* The servlet extends the HttpServlet class and overrides the doPost
     method. The doPost method is called when a client makes a POST request
     (<FORM name=... METHOD=post ...>), and results in the simple HTML page
     being returned to the client. */
     class Servlet_Class1 extends HttpServlet {
     /* not sure if main() method is necessary for servlets? */
          public static void main(String[] args) {
               System.out.println("inside Servlet_Class1");
          }     // main() method
          public void doPost(HttpServletRequest request,
               HttpServletResponse response)
               throws ServletException, IOException
               ... the usual
I successfully ran/accessed the following:
     http://localhost:8100/index.jsp     <-- worked; JRun installation default
     http://localhost:8100/zhome2.jsp <-- worked; a simple JSP page I wrote
http://localhost:8100/ returns the standard IE page with the
caption/title "HTTP 500 Internal server error" and message
"The page cannot be displayed. There is a problem with the page you are
trying to reach and it cannot be displayed." index.jsp does exist under
C:\JRun4\servers\default\default-ear\default-war.
I successfully ran some servlets from the 'techniques' sample directly
by entering their URLs:
http://localhost:8200/techniques/servlet/ContextInfo     <-- worked
     http://localhost:8200/techniques/servlet/InitInfo     <-- worked
I installed JRun as an "application", NOT as a "service".
My PC configuration:
     java version "1.4.0_01"
     Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0_01-b03)
     Java HotSpot(TM) Client VM (build 1.4.0_01-b03, mixed mode)
     JRun 4 (Build 47304)
     WinNT 4.0 SP5
     IE 5.50
     CLASSPATH=.;D:\jakarta-tomcat-3.3.1\lib\common\servlet.jar;C:\JRun4\servers\defa
     ult\default-ear\default-war\WEB-INF\classes
     JAVA_HOME=C:\j2sdk1.4.0_01
     Path=C:\j2sdk1.4.0_01\bin;C:\WINNT\system32;C:\WINNT;C:\Program Files\Network As
     sociates\PGPNT;C:\Program Files\MTS;d:\MSSQL7\BINN
I previously installed Tomcat but gave up on it. But I am using it's
servlet.jar to cleanly compile servlets.

Answer 1

still no success. I also tried entering a dot-qualified servlet name
     http://localhost:8100/servlet/zservlets.Servlet_Class1
     http://localhost:8100/zservlets.Servlet_Class1
My default-event.log contained:
08/22 18:33:19 info No JDBC data sources have been configured for this
server (see jrun-resources.xml)
08/22 18:52:03 user ServletInvoker: init
08/22 19:49:16 info Servlet_Class1
08/22 19:49:16 info Servlet_Class1
08/22 19:49:17 info Servlet_Class1
08/22 19:49:17 error Requested resource null not found
08/22 19:49:33 info zservlets
08/22 19:49:33 info zservlets
08/22 19:49:33 error Requested resource null not found
08/22 19:49:35 info zservlets
08/22 19:49:35 error Requested resource null not found
08/22 19:51:46 info Deployer Service is undeploying watched URL
file:/C:/JRun4/servers/default/default-ear/
08/22 19:51:47 user ServletInvoker: destroy
08/22 19:51:47 info 3 session(s) persisted
08/22 19:51:47 info Removing web application service from servlet engine
service: default-ear#default-war
08/22 19:51:47 info Unregistering enterprise application:
file__C__JRun4_servers_default_default-ear_#default-ear
08/22 21:41:16 error Servlet_Class1
[1]java.lang.IllegalAccessException: Class
jrun.servlet.WebApplicationService can not access a member of class
zservlets.Servlet_Class1 with modifiers ""
     at sun.reflect.Reflection.ensureMemberAccess(Reflection.java:57)
     at java.lang.Class.newInstance0(Class.java:290)
08/22 21:41:25 user FileServlet: init
08/22 21:41:25 error Requested resource /Servlet_Class1 not found
08/22 21:41:27 error Requested resource /Servlet_Class1 not found