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How to use ferm firewall rules on OpenWRT

OpenWRT has a very flexible Firewall configuration system, but for various reasons I want to use rules generated by ferm instead.

Use this howto on your own risk! I do not guarantee that it's free of errors! If you're not absolutly sure about something written here, or you don't know how to make backups of your router config and how to savely restore them: don't follow these instructions!

Logout from HTTP auth using Apache

Since there is no mechanism defined to log the user out of a HTTP authenticated session you have to use a workaround. Most browsers forget their login data once they received a 403 response. The problem is, that the user have to return to the normal starting page manually.

Update 2017-02-22: It seems that this technique doesn't work anymore in recent Firefox and Chrome browsers.

Java: process http.proxyUser and http.proxyPassword

Some tutorials suggest to use the system properties http.proxyUser and http.proxyPassword to get proxy authentication, but that won't work since - in contrast to http.proxyHost and http.proxyPort - these properties will not be processed by Java's HttpURLConnection.

Other suggest to use a custom default Authenticator. But that's dangerous because this would send your password to anybody who asks.

VDR Client / Server mit automatischen Shutdown und Resume

Wichtiger Hinweis: Dieses "HowTo" ist in erster Linie als Erinnerung für mich selbst gedacht. Wenn ich jemand anderem damit ebenfalls helfen kann freue ich mich, aber aus zeitlichen Gründen kann ich im Moment nur sehr begrenzt Support geben.

Ich betreibe den yaVDR als Client/Server-Anwendung. Im Server befinden sich zwei DVB-S(2)-Karten, der Client im Wohnzimmer ist über das LAN angebunden.

JTextPane with background color

JTextPane and his ancestors JEditorPane and JTextComponent won't respect the color defined with setBackground(Color) since they display a "styled document" and expect the background color to be defined in the content. You'll always see a white background.

To change the background color (without modifying the content) you have to define attributes for the document:

BTRFS im RAID-1-Modus im praktischen Einsatz

Soeben habe ich die neuen 2TB-Festplatten in den Media-PC eingebaut und mich dazu entschieden, dieses mal dem neuen Linux-Dateisystem btrfs eine Chance zu geben. Im Gegensatz zum klassischen ext beherscht dieses nämlich von Haus aus RAID-Funktionalitäten (Level 0, 1 und 10) sowie Snapshots. Das RAID im Level 1 schützt vor physikalischen Fehlern, die Snapshots - sofern man sie regelmäßig anlegt - vor logischen, wie einem versehentlichen 'rm -rf'.

Java: Model-View-Controller without memory leaks

When doing MVC programming in Java, there is a problem that most people don't know about. I've ignored it myself much too long. The problem is that when you bind a model class to an UI component you will get a giant memory leak.

What happens?

Well, imagine a model class supporting listening for property changes. A simple example might look like this (I extend from PropertyChangeSupport here so that I don't have to delegate all the methods, normally you wouldn't do so, of course):