Java EE (Java Enterprise Edition) General Discussion

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.