Apache not starting because of Skype

When I started Apache I saw these errors.

$ (OS 10048)Only one usage of each socket address (protocol/network address/port) is normally permitted.  : make_sock: could not bind to address
no listening sockets available, shutting down
Unable to open logs

This was puzzling to me since Apache was starting fine before. Fortunately on this forum thread, Failure Message starting Apache, one of the respondents had diagnosed the problem.

I’ve had the same problem. I noticed that when I reboot my computer (running XP pro), sometimes Apache worked. Then, I change the port to 3128 and it worked. But, then I was illuminated by God, and do a netstat -ao (-o displays the PID) and discover that Skype was listening in port 80 instead of apache -that is, I have both set up to run at startup, thus, if apache started first, it will have port 80 available, and Skype not, and vice-versa-. So my solution was to remove Skype from startup -I don’t use it too often- and make apache (and myself) happy by making port 80 available.

All I had to do was stop Skype and everything was fine. Too bad TcpView was not able to tell me that Skype was using port 80.

Installing Apache 2.2 with mod_rewrite and mod_proxy_balancer

As mentioned in my post, Configuring Apache to work with a Mongrel Cluster, you need an Apache installation with mod_rewrite and mod_proxy_balancer. Unfortunately on the Red Hat installation I was using the default installation is Apache 2.0 which does not have mod_proxy_balancer. When I tried to upgrade it using up2date I got some errors that seemed to indicate this install was not properly registered. I then tried using the Apache 2.2 install done by the tech guy but this install did not have the modules I needed.

Therefore it was time for me to do the install by myself. Fortunately it was not hard with the help of this article, Building Apache 2.2 plus the manual.

Here is what I did.

$ wget http://apache.mirror99.com/httpd/httpd-2.2.8.tar.gz
$ tar xvfz httpd-2.2.8.tar.gz
$ cd httpd-2.2.8
$ ./configure --enable-rewrite=shared --enable-proxy=shared \
    --enable-proxy_balancer=shared --enable-proxy_http=shared
$ make
$ sudo make install
$ sudo /usr/local/apache2/bin/apachectl start

Configuring Apache to work with a Mongrel Cluster

Previously I wrote about Configuring Capistrano and Mongrel. Now we are going to configure Apache to work with the Mongrel cluster.

For this article I used the chapter Setting Up A Development Environment in Agile Web Development with Rails, version 2.0, plus this article.

Capistrano working together with Mongrel allows you to deploy and restart Mongrel clusters quite nicely.

Configure Apache proxy balancer

Apache has a mod_proxy_balancer module which must be enabled. Once this is done you can add the following to the end of conf/httpd.conf or if you are on Red Hat Linux you can put the proxy balancing section in /etc/httpd/conf.d/myapp.proxy_cluster.conf and the virtual host section in /etc/httpd/conf.d/myapp.conf.


  Include conf/myapp.common (or Include conf.d/myapp.common)
  ErrorLog logs/myapp_errors_log
  CustomLog logs/myapp_log combined

Configure Apache Virtual Host

Next you configure the virtual host that represents the Ruby on Rails application in the custom file conf/myapp.common or if you are on Red Hat Linux in /etc/httpd/conf.d/myapp.common.

ServerName myapp.com
DocumentRoot /usr/local/rails/myapp/current/public

  Options FollowSymLinks
  AllowOverride None
  Order allow,deny
  Allow from all

RewriteEngine On

# Uncomment for rewrite debugging
#RewriteLog logs/myapp_rewrite_log
#RewriteLogLevel 9 

# Check for maintenance file and redirect all requests
RewriteCond %{DOCUMENT_ROOT}/system/maintenance.html -f
RewriteCond %{SCRIPT_FILENAME} !maintenance.html
RewriteRule ^.*$ /system/maintenance.html [L]

# Rewrite index to check for static
RewriteRule ^/$ /index.html [QSA] 

# Rewrite to check for Rails cached page
RewriteRule ^([^.]+)$ $1.html [QSA]

# Redirect all non-static requests to cluster
RewriteRule ^/(.*)$ balancer://mongrel_cluster%{REQUEST_URI} [P,QSA,L]

Restart Apache

$ sudo /usr/local/apache2/bin/httpd -k restart


$ sudo /etc/init.d/httpd restart

Shop.com Product Display Integration

Last year for Casual Male I did the Shop.com Product Display Integration (PDI) which allows Casual Male to sell its products on Shop.com.

The integration involved three steps.

  1. Access all the products organized by category using ATG’s GSA Repository.
  2. Export the products into an XML file according to the PDI DTD using the XStream library.
  3. FTP upload to Shop.com’s servers using Apache Commons Net library.

Submitting a form with a radio button

Submitting a form from a radio button is not common but it is a nice UI which is even better when done with AJAX.

A typical form with two radio buttons would look something like this.



But with basic JavaScript you can make a simpler form like this.


If you are using Struts the above form’s JSP would be:


How to Log SQL on JBoss

Edit the log4j.xml in the conf directory as shown below to turn on SQL debugging of the JDBC CMP plugin.

/apps/jboss/server/default/conf :->diff -c log4j.xml~ log4j.xml
*** log4j.xml~  Mon Sep 30 18:09:27 2002
--- log4j.xml   Tue Apr  4 20:41:18 2006
*** 61,73 ****




--- 61,79 ----




If you want to log Hibernate SQL statements:


If you want to log everything Hibernate’s doing, including SQL statements, schema export, transactions, etc.: