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--- log4j [2015/10/15 12:47] – [Property Substitution] skip
+++ log4j [2020/12/27 20:35] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+==== Adding Configurations ====
+Rules:
+  - The configuration has to be stored in classpath. (In eclipse RCP you can store it in a Fragment)
+  - The path is set relatively to the classpath folders
+  - The path can be passed sa a JVM attribute:
+<code>
+-Dlog4j.configuration=/log4j_config/alf.log4j.properties -Dlog4j.debug
+</code>
+Example properties File:
+<code>
+# Set root logger level to DEBUG and its only appender to Console.
+log4j.rootCategory=INFO, others
+log4j.category.de.ivu=DEBUG, IVUfile, IVUconsole
+log4j.additivity.de.ivu=false
+log4j.category.de.ivu.fare.rcp.gui.accordion=ERROR
+##################
+# general appender
+##################
+# console
+log4j.appender.others=org.apache.log4j.ConsoleAppender
+log4j.appender.others.layout=org.apache.log4j.PatternLayout
+log4j.appender.others.layout.ConversionPattern=*GENERAL* %d <%t> [%p] %c - %m%n
+log4j.appender.others.Threshold=WARN
+##################
+# ivu appender
+##################
+# console
+log4j.appender.IVUconsole=org.apache.log4j.ConsoleAppender
+log4j.appender.IVUconsole.layout=org.apache.log4j.PatternLayout
+log4j.appender.IVUconsole.layout.ConversionPattern=*OVU-LOG* %d <%t> [%p] %c - %m%n
+log4j.appender.IVUconsole.Threshold=DEBUG
+# file
+log4j.appender.IVUfile=org.apache.log4j.RollingFileAppender
+log4j.appender.IVUfile.File=./log/application.log
+log4j.appender.IVUfile.MaxFileSize=2048KB
+log4j.appender.IVUfile.MaxBackupIndex=3
+log4j.appender.IVUfile.layout=org.apache.log4j.PatternLayout
+log4j.appender.IVUfile.layout.ConversionPattern=*OVU-LOG* %d <%t> [%p] %c - %m%n
+log4j.appender.IVUfile.Threshold=DEBUG
+</code>
+==== Property Substitution ====
+It is possible to use system properties / environment variables etc. inside the log4j configuration.
+The syntax looks as following:
+<code>
+${env:APPDATA}
+${sys:osgi.nl.user}
+...
+</code>
+All the details about the sysntax and all possible substitution sources are listed here: \\ https://logging.apache.org/log4j/2.0/manual/configuration.html#PropertySubstitution
+==== FILTER ====
+Filter may be used to filter out some stuff.
+E.g. the RegEx Filter is very powerfull and may be placed directly inside the configuraiton, to filter everything:
+<code>
+<configuration status="warn" packages="org.graylog2.log4j2">
+	<RegexFilter regex=".*(TECHMODULE).*" onMatch="ACCEPT" onMismatch="DENY"/>
+</code>