Servlets don't work with Tomcat - class is not a servlet

The servlet mappings would seem to be in order. Here's the web.xml file located in tomcat5/webapps/myapp/WEB-INF:

<?xml version="1.0" encoding="ISO-8859-1"?>

<!--

Copyright 2004 The Apache Software Foundation

Licensed under the Apache License, Version 2.0 (the "License");

you may not use this file except in compliance with the License.

You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software

distributed under the License is distributed on an "AS IS" BASIS,

WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

See the License for the specific language governing permissions and

limitations under the License.

-->

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

version="2.4">

<display-name>Welcome to Tomcat</display-name>

<description>

Welcome to Tomcat

</description>

<!-- JSPC servlet mappings start -->

<servlet>

<servlet-name>measurements</servlet-name>

<servlet-class>org.myapp.measureIt</servlet-class>

<init-param>

<param-name>foo</param-name>

<param-value>bar</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>measurements</servlet-name>

<url-pattern>/measurements</url-pattern>

</servlet-mapping>

and the class files are located in classes/org/myapp folder Still, myapp/measurements results in the errors above.

In server.xml, the webapps folder seems to be configured appropriately:

<Host name="localhost" appBase="webapps"

unpackWARs="true" autoDeploy="true"

xmlValidation="false" xmlNamespaceAware="false">

What could be wrong?

NBarnesa at 2007-7-15 1:28:52 >

Here is the code of measureIt.java

/**

* Class is to receive a request coming from index.jsp and invoke a class which generates the HTML page. The generated page is sent as response. */

package org.myapp;

import javax.servlet.*;

import javax.servlet.http.*;

import java.io.*;

import java.util.*;

import org.myapp.DbMeasurements;

public class MeasureIt extends HttpServlet {

String url = "";

public MeasureIt()

{

ResourceBundle rb = ResourceBundle.getBundle("LocalStrings");

url = rb.getString("url");

}

public void init() throws ServletException

{

super.init();

ServletContext ctx = getServletContext();

}

public void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException

{

System.out.println ("*** AccessServlet got a GET request");

makePage(req, resp);

}

public void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException

{

System.out.println ("*** AccessServlet got a POST request");

makePage(req, resp);

}

private void makePage(HttpServletRequest req, HttpServletResponse res)

throws IOException

{

String begdate;

String enddate;

String part;

String count;

begdate = req.getParameter("begdate");

enddate = req.getParameter("enddate");

part = req.getParameter("part");

count = req.getParameter("count");

String shtml = DbMeasurements.generateHtml(url, begdate, enddate, part, count);

PrintWriter out = res.getWriter();

res.setContentType("text/html");

out.println(shtml);

out.close();

}

}

Basically, the index.jsp allows access to different pages (measurements data, graphical views etc.), which use many unrelated classes, none of which are found.

To get the data, I'm using mysql-connector-java-3.1.13 to connect to a mySQL database, is this ok with this version of Tomcat? I don't have much knowledge on inner workings of jdbc drivers. The database username/password are passed using LocalStrings.Properties, they are correct in themselves.

NBarnesa at 2007-7-15 1:28:52 >

Thanks for the help, found the error:

For some reason, the following line in setclasspath.sh was commented:

#CLASSPATH=

uncommented it, and now the classes are found. It didn't occur to me that duplicates in classpath result in this.

....

Although, the servlets still don't actually fetch any data from the mysql database. Catalina.out prints out the following:

*** AccessServlet got a POST request

Exception: com.mysql.jdbc.Driver

null

null

6.10.2006 15:20:00 org.apache.catalina.connector.CoyoteAdapter service

SEVERE: An exception or error occurred in the container during the request processing

java.lang.NoSuchMethodError: javax.servlet.ServletResponse.isCommitted()Z

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:112)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)

at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:199)

at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:282)

at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:754)

at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:684)

at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:876)

at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)

at java.lang.Thread.run(Thread.java:595)

Does anybody know what that is all about?

NBarnesa at 2007-7-15 1:28:52 >