Note to myself: Get available physical memory of a xen host
18-Aug-11Just use: xm topxm top
Java and invalid SSL certificates (java-trustprovideragent)
25-Jul-11It’s truly easy to generate a SSL certificate for example to use with tomcat (see here). This certificate is invalid as it is self-signed by you and it often doesn’t match the hostname. This is no problem when your access the project with a browser, with more or less jumps through hoops you accept the […]
MySql compatible AES encryption / decryption in Java
18-Jul-11MySQL has an aes_encrypt/aes_decrypt pair of functions (Encryption and Compression Functions) that enable encryption and decryption of data using the official AES algorithm. The functions are easy to use (select AES_ENCRYPT(‘text’,’password’)) and the result is easy to store (insert into secrets values HEX(AES_ENCRYPT(‘text’,’password’))) as hex values. I used this technique for a while but i […]
Apache httpd, Tomcat und sendfile
28-Jun-11I used to use mod_xsendfile by Nils Maier, who’s Homepage doesn’t seem to exist anymore, to send files from Ruby proxied by Apache respectively powered by modrails. Those files shouldn’t be in any public www directory as authorization needs to be checked, but are accessed very often so that streaming them is not an option. […]
Creating a better PathMatcher for Spring 3
09-Mar-11Spring 3 has excellent support for mapping URLs to @Controller methods through the @RequestMapping annotation. This works quite well and i especially like the fact having the mapping right next to the method and not in some other config file like routes.rb. My goal was to have urls like http://foobar.com/resource, http://foobar.com/resource.html, http://foobar.com/resource.zip etc. This is […]