So I found in the JBossBook an example for log4jproperties. In the header there was added:
# Set the JBossCategoryFactory as the default CategoryFactory
In the API for JBoss2.4.4 is written for JBossCategory: "..A custom log4j category that adds support for trace() level logging.."
But I didnt found this class org.jboss.logging.log4j.JBossCategory in the /lib/ext.
Where can I find this class??