HttpServlet cannot be resolved or is not a valid superclass

staudinger May 10, 2004 12:08 PM

Hello,

i created a .war file with a WEB-INF/web.xml file:

<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
 PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
 <servlet-name>PlainServlet</servlet-name>
 <servlet-class>uls.PlainServlet</servlet-class>
</servlet>

<servlet-mapping>
 <servlet-name>PlainServlet</servlet-name>
 <url-pattern>/servlet/*</url-pattern>
</servlet-mapping>
</web-app>

Now, when i want to access my servlet i get the following error:

exception

javax.servlet.ServletException: Error instantiating servlet class uls.PlainServlet
 at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:912)
 at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:668)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
...

and somewhat lower:

root cause

java.lang.Error: Unresolved compilation problems:
 HttpServlet cannot be resolved or is not a valid superclass
 HttpServletRequest cannot be resolved (or is not a valid type) for the argument request of the method doGet
 HttpServletResponse cannot be resolved (or is not a valid type) for the argument response of the method doGet

 at uls.PlainServlet.(PlainServlet.java:17)
...

Why can't jboss find the servlet.jar? I am using the default configuration, isn't tomcat in the path by default? Should i put my servlet.jar somewhere?

Thanks in advance,
Ulrich

Here is the code for my servlet:


/*
 * Created on May 9, 2004
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package uls;

import javax.servlet.*;
import javax.servlet.http.*;

/**
 * @author us
 *
 * To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Geneqration - Code and Comments
 */
public class PlainServlet extends HttpServlet{

 public void doGet(HttpServletRequest request, HttpServletResponse response){
 try{
 java.io.PrintWriter out = response.getWriter();
 out.println("<html><body>hello world.</body></html>");
 }
 catch(Exception e){
 e.printStackTrace();
 }

 }

}

Of course it compiles.