Apache 2 and Tomcat 7 on Ubuntu 10.04 in VirtualBox 4.06xxx

[Harry Henriques]

Hello,

Thanks for looking at this thread.

I am not able to forward requests from Apache2.2.14 to Tomcat7.0.14 using the following browser address:

http://www.henriquesh.local:80/Beer-v1/form.html

I am able to invoke the servlet directly from the Tomcat7.0.14 container using the following browser address:

http://www.henriquesh.local:8080/Beer-v1/form.html

$CATALINA_HOME is /usr/share/tomcat7
$CATALINA_BASE is /var/lib/tomcat7

                   /var/lib/tomcat7
                             |
                             |---- webapps
                                          |
                                          |---- ROOT
                                          |
                                          |---- Beer-v1
                                                     |
                                                     |---- form.html
                                                     |
                                                     |---- index.html
                                                     |
                                                     |---- WEB-INF
                                                                  |
                                                                  |---- web.xml
                                                                  |
                                                                  |---- lib
                                                                  |
                                                                  |---- classes
                                                                             |
                                                                             |---- com/example 
                                                                                           |
                                                                                           |---- model 
                                                                                           |          |  
                                                                                           |          |---- BeerExpert.class
                                                                                           |
                                                                                           |---- web
                                                                                           |          |
                                                                                           |          |---- BeerSelect.class

I have been working on this problem for hours, and I haven't been able to access Tomcat 7 from Apache 2.

Do you have any ideas where I might look to correct this problem?

Thanks,
Harry

[Harry Henriques]

See http://tomcat.apache.org/connectors-doc/webserver_howto/apache.html for more information.

[Harry Henriques]

Hello,

I'm not really sure if I'm making any progress. I copied my webapplication from /var/lib/tomcat7/webapps to /var/www. I can launch the application from either Apache2.2.14 or from Tomcat7.0.14 with either http://localhost:80/Beer-v1/form.html or http://localhost:8080/Beer-v1/form.html, respectively.

In /var/www/Beer-v1/WEB-INF, I have the web.xml file that defines the servlet:

<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
 Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You 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/javaee"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
  version="3.0"
  metadata-complete="true">  

  <display-name>Welcome to Tomcat</display-name>
  <description>
     Welcome to Tomcat
  </description>
 
  <servlet>
  <servlet-name>Ch3 Beer</servlet-name>
  <servlet-class>com.example.web.BeerSelect</servlet-class>
  </servlet>

  <servlet-mapping>
  <servlet-name>Ch3 Beer</servlet-name>
  <url-pattern>/SelectBeer.do</url-pattern>
  </servlet-mapping>

</web-app>

When I launch the webapplication from Apache2.2.14, I get the following error message:

[Thu Jun 30 17:45:23 2011] [error] [client 127.0.0.1] File does not exist: /var/www/Beer-v1/SelectBeer.do, referer: http://localhost/Beer-v1/form.html
[Thu Jun 30 17:45:23 2011] [error] [client 127.0.0.1] File does not exist: /var/www/favicon.ico
[Thu Jun 30 17:45:23 2011] [error] [client 127.0.0.1] File does not exist: /var/www/favicon.ico

I have setup httpd.conf
I have setup workers.properties with a worker called ajp13_worker on port 8009
I am using mod_jk.so that was included with apache2 on Ubuntu.

I'm not exactly sure what is going wrong? Any ideas?

Thanks,
Harry Henriques

[Harry Henriques]

Hello,

I am now able to forward an HTTP/1.1 request from Apache 2.2.14 to Tomcat 7.014 on Ubuntu 10.04 LTS (32-bit) in a VirtualBox 4.0.6r71416 on top of Windows 7 (64-bit):

http://localhost:80/Beer-v1/form.html

The DocumentRoot for the default VirtualHost in apache2 is /var/www. In this folder, /var/www/Beer-v1/form.html is the only file (a static HTML page).

It is unnecessary to have WEB-INF/web.xml on the apache2 side.

$TOMCAT_HOME/webapps/Beer-v1/WEB-INF/web.xml is all that is needed to map SelectBeer.do to $TOMCAT_HOME/webapps/Beer-v1/WEB-INF/classes/com/example/web/BeerSelect.class

The following request is forwarded by the mod_jk.so to the tomcat-connector at port 8009 specified in $TOMCAT_HOME/conf/server.xml

http://localhost/Beer-v1/SelectBeer.do

I didn't modify $TOMCAT_HOME/conf/server.xml at all.

On the apache2 side, the workers.properties file specifies that worker.ajp13_worker.port=8009

mod_jk.so (1.2.28) is packaged with Apache2.2.14, and is in the /usr/lib/apache2/modules/mod_jk.so folder. I was able to successfully use this binary file without generating my own copy.

I was unable to auto-generate the mod_jk.conf file using the "-jkconf" option at Tomcat 7.0.14 startup. I don't think that it is possible with this version of Tomcat.

I did download tomcat-connectors-1.2.31-src.tar.gz from the tomcat-connectors website. This tarball has a file called httpd-jk.conf that is useful when generating your own mod_jk.conf

apache2 has another example /usr/share/doc/libapache2-mod-jk/httpd_example_apache2.conf

I used both of these examples to implement mod_jk.conf. I put the finished version in /etc/apache2/mods-enabled/mod_jk.conf. This file is Include in /etc/apache2/apache2.conf.

I removed "LoadModule jk_module /usr/lib/apache2/modules/mod_jk.so" from mod_jk.conf. This line is already included in /etc/apache2/mods-enabled/jk.load.

I didn't "Include /usr/lib/apache2/modules/mod_jk.so" in httpd.conf.

I used the apache2 example in /etc/libapache2-mod-jk/workers.properties file. I copied, modified, and saved this file right in this folder.

In a fresh install of apache2, the /etc/apache2/httpd.conf file is empty. I put the following code snippet in this file. This file is Include in /etc/apache2/apache.conf.

<VirtualHost *:80>
     ServerName localhost.localdomain
     ServerAlias localhost
     DocumentRoot /var/www
     JkMount /Beer-v1/*.jsp ajp13_worker
     JkMount /Beer-v1/*.do ajp13_worker
     JkMount /*/servlet/ ajp13_worker
</VirtualHost>

There is an entry in /etc/hosts, i.e. 127.0.0.1 localhost.localdomain localhost

ajp13_worker was created in the workers.properties file.

I created a tomcat user in Ubuntu and in the $TOMCAT_HOME directory I executed the following command: sudo chown -R tomcat:tomcat *

This will only work after you create a tomcat user.

I also did this in $CATALINA_HOME.

A useful link is the following: http://www.linuxjournal.com/article/8561

Regards,
Harry Henriques