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From Douglas E Wegscheid <Douglas_E_Wegsch...@whirlpool.com>
Subject Re: Problems with inheritance of com.foo... loggers
Date Thu, 04 Feb 2010 12:16:38 GMT
"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.gruentjes@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:
> 
> jens@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.
> jens@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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