"de.wota.segmentation.Bar" will inherit from "de.wota.segmentation",
"de.wota", and "de" but not "de.wota.MyApp".
Change your configuration to set up logging for "de.wota" instead of
"de.wota.MyApp".
Douglas E Wegscheid
Lead Technical Analyst, Whirlpool Corporation
(269)-923-5278
"A wrong note played hesitatingly is a wrong note. A wrong note played
with conviction is interpretation."
"Jens Gruentjes" <jens.gruent...@ebira.de> wrote on 02/04/2010 02:57:10
AM:
> Hello to all readers,
>
> I am new to log4j and I encounter several problems which are maybe
> caused by my limited understanding fo log4j.
>
> I have a simple setup with two classes (de.wota.MyApp and
> de.wota.segmentation.Bar) and an xml configuration file for log4j. I
> thought that the logger defined in Bar.java inherits its level and
> most of all its appender(s) from the logger defined in MyApp.java. But
> despite reading the manuals and the list archives I always get the
> following error when I execute MyApp:
>
> j...@jensen ~/Java/wota_rw $ java de.wota.MyApp
> log4j: reset attribute= "false".
> log4j: Threshold ="null".
> log4j: Retreiving an instance of org.apache.log4j.Logger.
> log4j: Setting [de.wota.MyApp] additivity to [true].
> log4j: Level value for de.wota.MyApp is [DEBUG].
> log4j: de.wota.MyApp level set to DEBUG
> log4j: Class name: [org.apache.log4j.ConsoleAppender]
> log4j: Setting property [target] to [System.out].
> log4j: Setting property [threshold] to [INFO].
> log4j: Parsing layout of class: "org.apache.log4j.PatternLayout"
> log4j: Setting property [conversionPattern] to [%8r %p %c %x - %m%n].
> log4j: Adding appender named [console] to category [de.wota.MyApp].
> 0 INFO de.wota.MyApp - Entering application.
> log4j:WARN No appenders could be found for logger
(de.wota.segmentation.Bar).
> log4j:WARN Please initialize the log4j system properly.
> Parent is root
> 1 INFO de.wota.MyApp - Exiting application.
> j...@jensen ~/Java/wota_rw $
>
> What I expected to see was the output from Bar.java which is missing
> here. I wanted to know who is the parent of the logger in Bar.java is
> and it turned out to be root. I thought that this should be the logger
> from MyApp.java. Can someone tell me what I misunderstand? I am a
> little confused. The code follows below.
>
> Thanks for your explanations and your help!
>
>
> This is MyApp.java:
>
> package de.wota;
>
> import org.apache.log4j.Logger;
> import org.apache.log4j.xml.DOMConfigurator;
>
> import de.wota.segmentation.Bar;
>
> public class MyApp {
> // Define a static logger variable so that it references the
> // Logger instance named "MyApp".
> static Logger logger = Logger.getLogger(MyApp.class);
>
> public static void main(String[] args) {
>
> // Set up an xml configuration that logs on the console.
> DOMConfigurator.configureAndWatch("config_log.xml");
>
> logger.info("Entering application.");
> Bar bar = new Bar();
> bar.doIt();
> logger.info("Exiting application.");
> }
> }
>
> This is Bar.java:
>
> package de.wota.segmentation;
>
> import org.apache.log4j.Logger;
>
> public class Bar {
> static Logger logger = Logger.getLogger(Bar.class);
>
> public void doIt() {
> logger.debug("Did it again!");
> System.out.println("Parent is "+logger.getParent().getName());
> }
>
> }
>
> And finally config_log.xml
>
> <?xml version="1.0" encoding="UTF-8" ?>
> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
>
> <log4j:configuration debug="true"
> xmlns:log4j="http://jakarta.apache.org/log4j/";>
>
> <appender name="console" class="org.apache.log4j.ConsoleAppender">
> <param name="Target" value="System.out"/>
> <param name="threshold" value="info" />
> <layout class="org.apache.log4j.PatternLayout">
> <param name="ConversionPattern" value="%8r %p %c %x - %m%n"/>
> </layout>
> </appender>
>
> <logger name="de.wota.MyApp">
> <level value="DEBUG" />
> <appender-ref ref="console" />
> </logger>
>
> </log4j:configuration>
>
> --
> Kind regards
> Jens
>
>
>
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