✎ Log4j Instead of Logging API

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~~NOTRANS~~
~~Title: Log4j instead of Logging API~~

If you want to use log4j or log4j2 instead of standard Java logging API for your application, simply add the logger factory configuration to your classpath. First, create a file with the name

**loggerfactory.properties**

in one of your source/resource directories. Don't use a package name!\\ 
Put following content in it:

<file properties loggerfactory.properties>
default.class=com.sibvisions.util.log.log4j.Log4jLoggerFactory
</file>

Don't forget to add the dependencies to your project (log4j or log4j2) and to configure:

<file properties log4j.properties>
log4j.rootLogger=ERROR,stdout

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%p\t%d{ISO8601}\t%r\t%c\t[%t]\t%m%n
</file>

<file xml log4j2.xml>
<?xml version="1.0" encoding="UTF-8"?>

<Configuration>
  
  <Appenders>
    <Console name="STDOUT" target="SYSTEM_OUT">
      <PatternLayout pattern="%d %-5p [%t] %C{1} (%F:%L) - %m%n"/>
    </Console>
  </Appenders>
  
  <Loggers>
    <Root level="error">
      <AppenderRef ref="STDOUT"/>
    </Root>
  </Loggers>
  
</Configuration>
</file>

Another option, to configure the logger factory is to set the system property: 

<code>
LoggerFactory.default=com.sibvisions.util.log.log4j.Log4jLoggerFactory
</code>
as JVM start parameter (-DLoggerFactory.default=...).

This system property works in all JVx versions. JVx before 2.8.5 also had different configuration options:

* config.xml of your server zone:

<file xml config.xml>
<?xml version="1.0" encoding="UTF-8"?>

<server>
  
  <logfactory>com.sibvisions.util.log.log4j.Log4jLoggerFactory</logfactory>

  ...
</server>
</file>

* application.xml 

<file script>
<application>
  ...
  <Launcher.logfactory>com.sibvisions.util.log.log4j.Log4jLoggerFactory</Launcher.logfactory>
</application>
</file>

This options are not supported in newer JVx versions because you had to configure logging in different places.

\\ 
**<fs 20px>Note</fs>**

We have sample files for log4j and log4j2 in our [[http://sourceforge.net/p/jvx/code/HEAD/tree/trunk/java/library/test/|repository]].