Efficient Random Number Generation

xkcd.com recently published an O(1) random number generator which is additionally extremely easy to implement. A very interesting feature might be its ability to generate the same sequence of random numbers over and over without requiring the user to provide a seed. Amazing! :)

Apache + SVN: Could not open the requested SVN filesystem

After migrating to a new machine (running Ubuntu + Plesk) and setting up SVN over HTTP (via libapache2-svn) we recently faced the problem that under some circumstances some new files could not be committed to the repo anymore. TortoiseSVN just returned the well known but unspecific error Could not open the requested SVN filesystem. After checking the web server logs (be sure to locate the right ones if you are using Plesk - by default they are located in the vhosts dir, e.g. /var/www/vhosts/yourdomain/statistics/logs/error_log) the following kind of internal errors showed up:

(20014)Internal error: Can't open file '/srv/svn/error/format': No such file or directory
(20014)Internal error: Can't open file '/srv/svn/error_docs/format': No such file or directory

For some bizarre reasons Apache tried to fetch information from a repository called error resp. error_docs (depending on environment). After hours of research it showed up this has to do with Plesk's custom error docs which are activated by default.

Solution: Disable custom error docs for your domain. To do so, log in to Plesk, navigate to the domain and uncheck the "Custom error documents" box in hosting settings.
Alternativ solution: Create a repo named error (or error_docs or whatever you find in the logs).

Cash Group Automaten

Cash Group Automaten is ready for download via Android Market. Get it now to find cash points of Cash Group banks near your location. Scanning or clicking one the following barcodes redirects you to Android Market.
The Lite version shows a list of cash points near your location, lets you display single POIs on a map and provides the ability to navigate to any of the found items. The PRO version additionally offers a map view for all POIs at once and lets you search near user given addresses (e.g. at your holiday resort). Furthermore you may share the POI list, e.g. by sending it via email or sms or simply by copying it to your favorite notes app.
Enjoy, we are curious about any feedback.

Lite

           

Pro

Clupper

Clupper is a powerful tool to create screenshots and easily upload the contents of your clipboard.
Screenshots, files and text can be published with one click. The URL to the published content can be re-copied to the clipboard so you can instantly paste it to ICQ, an email or anywhere else. Furthermore, you are able to edit, mark and crop screenshots before uploading.

Download Now