Multiple loggers

aukemid · **Joined:** Wed Mar 10, 2010 4:48 am **Posts:** 106

At the moment I'm using the logger like this:

Code:

public static org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger("net.sf.hibernate");
logger.error("test");

This way I use the same logger as Hibernate.
My logs and the logs from Hibernate are mixed into 1 file.

Can I split this? So log files are created for the hibernate logs and different files are created for my logs.

My log4j.xml:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" >

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
   <appender name="console" class="org.apache.log4j.ConsoleAppender">
      <layout class="org.apache.log4j.PatternLayout">
         <param name="ConversionPattern" value="%5p - (%F:%L) - %m%n" />
      </layout>
      <filter class="org.apache.log4j.varia.LevelRangeFilter">
         <param name="LevelMin" value="WARN" />
      </filter>
   </appender>

   <appender name="fileAppender" class="org.apache.log4j.RollingFileAppender">
      <param name="file" value="logs/log4j.log" />
      <param name="MaxFileSize" value="5MB" />
      <param name="MaxBackupIndex" value="10" />
      <layout class="org.apache.log4j.PatternLayout">
         <param name="ConversionPattern" value="%5p - (%F:%L) - %m%n" />
      </layout>
   </appender>

   <root>
      <priority value="ALL" />
      <appender-ref ref="console" />
      <appender-ref ref="fileAppender" />
   </root>
</log4j:configuration>

grid · **Joined:** Tue Apr 06, 2010 8:46 am **Posts:** 7

You have to define two different appenders, one for each file, and also separate your loggers as to each one direct its output to the proper appender.
In your code then you pick the correct logger as:

Code:

private Logger logger = LoggerFactory.getLogger(CurrentClass.class);

I 've switched to logback so the following sample is only to give you the hint:

Code:

<appender name="hbFile" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <File>${logfilesLocation}/myapp-hibernate.log</File>
  .......
</appender>

 <appender name="myAppFile" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <File>${logfilesLocation}/myapp-application.log</File> 
  ......
 </appender>

 <logger name="org.hibernate" level="error">
    <appender-ref ref="hbFile"/>
 </logger>

 <logger name="my.app.base.package" level="error">
    <appender-ref ref="myAppFile"/>
  </logger> 

aukemid · **Joined:** Wed Mar 10, 2010 4:48 am **Posts:** 106

It's working like I want to, but logger.trace() isn't working.

When I do logger.trace(), it's doesn't get in my log file. If I use any higher level it does work. So logger.debug() works.

I really don't understand why, does anyone has an idea?

My log4j.xml:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" >

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
   <appender name="console" class="org.apache.log4j.ConsoleAppender">
      <layout class="org.apache.log4j.PatternLayout">
         <param name="ConversionPattern" value="%5p - (%F:%L) - %m%n" />
      </layout>
      <filter class="org.apache.log4j.varia.LevelRangeFilter">
         <param name="LevelMin" value="WARN" />
      </filter>
   </appender>

   <appender name="hibernateFileAppender" class="org.apache.log4j.RollingFileAppender">
      <param name="file" value="logs/log4jHibernate.log" />
      <param name="MaxFileSize" value="5MB" />
      <param name="MaxBackupIndex" value="10" />
      <layout class="org.apache.log4j.PatternLayout">
         <param name="ConversionPattern" value="%5p - (%F:%L) - %m%n" />
      </layout>
   </appender>

   <appender name="fileAppender" class="org.apache.log4j.RollingFileAppender">
      <param name="file" value="logs/log4j.log" />
      <param name="MaxFileSize" value="5MB" />
      <param name="MaxBackupIndex" value="10" />
      <layout class="org.apache.log4j.PatternLayout">
         <param name="ConversionPattern" value="%5p - (%F:%L) - %m%n" />
      </layout>
   </appender>

   <logger name="org.hibernate">
      <appender-ref ref="console" />
      <appender-ref ref="hibernateFileAppender" />
   </logger>

   <logger name="util.Logger">
      <appender-ref ref="console" />
      <appender-ref ref="fileAppender" />
   </logger>
</log4j:configuration>

sanne.grinovero · **Posted:** Thu Apr 15, 2010 4:58 am

this is an issue easily solved by reading the manual of log4j, has nothing to do with hibernate:

Quote:

and make sure you don't set a global filter like you did, which is removing all log statements below WARN:

Quote:

to control levels, it's recommended to use categories