Wednesday, September 21, 2005

Samsung CD Writer and K3B

I experienced weird things when writing CD using K3B. The verification
always fails when I use cdrecord in DAO mode. I tried RAW mode and
suprprisingly it succeeded.

Tuesday, September 6, 2005

Found Resin Xml Bug

I've finally fixed bug which plagued my project for some time. The bug causes FileSystemPreferences to throw warning messages like this:
Couldn't flush user prefs: java.util.prefs.BackingStoreException: java.lang.NullPointerException
every 30 seconds.
This is happened on Resin 3.0.13. I fixed this by adding the following lines into my resin-web.xml.

The NPE is thrown on the line 321 of java.util.prefs.XmlSupport

319 | Element xmlMap = (Element) doc.getChildNodes().item(1);
returns null ^^^
320 | // check version
321 | String mapVersion = xmlMap.getAttribute("MAP_XML_VERSION");

Resin xml implementation would behave correctly if item(1) was modified to item(0). After several considerations I decide to stop using resin xml implementation in favor of default JDK 1.4 xml instead of creating my own implementation of Preferences.