CODEWITHSUNDEEP
javalogginglog4j
Raymond
Raymond

Reputation: 614

How to Generate Log4j Log per Class Executed

I would like to ask about log4j

How to generate multiple log4j file for each class executed?

So I have 4 classes on my project and right now I set my log4j using log4j.properties utilizing FileAppender so that it only generates one log for all classes.

I would like to have log files per class. If I had 4 classes (A,B,C,D), I'd like to have A.log, B.log, C.log, and D.log containing information regarding log activity of each class.

Thank you very much.

Upvotes: 0

Views: 1067

Answers (2)

Raymond
Raymond

Reputation: 614

I had found a way to do it! Modify log4jproperties dynamically!

private void updateLog4jConfig(String className){

    Properties props = new Properties();
    try{
        InputStream configStream = getClass().getResourceAsStream("/log4j.properties");
        props.load(configStream);
        configStream.close();
    } catch(IOException ie){
        System.out.println("ERROR! Cannot load Configuration File....");
    }
    props.setProperty("log4j.appender.LOGGER.File", "./logs/"+className+".log");
    org.apache.log4j.LogManager.resetConfiguration();
    PropertyConfigurator.configure(props);

}

Cheers!

Upvotes: 0

vinayknl
vinayknl

Reputation: 1252

You can have your log4j configuration having multiple appender's pointing to different packages

<!-- pkg1 --> 
<appender name="LogFromPackage1" class="org.apache.log4j.FileAppender">
    <param name="File" value="pkg1.log" />
    <param name="Threshold" value="ERROR" />
    <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern" value="%-5p %t [%-40.40c] %x - %m%n"/>
    </layout>
</appender> 

<logger name="com.mypkg.pkg1">
    <appender-ref ref="LogFromPackage1"/>
</logger>

<!-- pkg2 -->
<appender name="LOGFromPackage2" class="org.apache.log4j.FileAppender">
    <param name="File" value="pkg2.log" />
    <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern" value="%-5p %t [%-40.40c] %x - %m%n"/>
    </layout>
</appender>

<logger name="com.mypkg.pkg2">
    <appender-ref ref="LOGFromPackage2"/>
</logger>

Upvotes: 1

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