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  1. #1
    joe2010 is offline Member
    Join Date
    Jan 2010
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    Default Log 4j Multithreading

    I'm trying to create log file based on my thread. Suppose I have two thread T1 and T2. I want to create logfile like T1_out.log and T2_out.log dynamically.
    After coding it I can create two log file which is thread specific but the all message is going to T2_out.log while T1_out.log remains blanks.

    Below is my code.

    class MyThread implements Runnable{

    Thread t;
    MyThread (String threadName) {
    t = new Thread(this,threadName);



    public void run() {
    String name=t.getName();
    EPSLogger logger =
    EPSLoggerFactory.getInstance().getLogger(MyThread. class);

    String outFileName= name +"_out.log";

    FileAppender fileAppenderOut= new FileAppender();


    URL url = MyThread.class.getClassLoader().getResource(Proper tyConfig.getInstance().getProperty("LOG_4J"));
    DOMConfigurator.configure(url);"Name", name);
    logger.debug("Name", name);

    }catch(Exception e)

    class MultiThreadLog {

    public static void main (String args[]) {

    new MyThread("T1");
    new MyThread("2");



    My Log4j.xml as below

    <appender name="CommonAppender" class="org.apache.log4j.RollingFileAppender">
    <param name="File" value="${}"/> <param name="Append" value="true"/>
    <param name="MaxFileSize" value="50MB"/>
    <param name="MaxBackupIndex" value="10"/>
    <param name="Threshold" value="DEBUG"/>
    <layout class="org.apache.log4j.PatternLayout">
    <param name="ConversionPattern" value="%d{DATE} %-5p %c - %m%n"/>

    The reason I'm getting all logs in T2_out.log is because I 'm using System.setproperties();

    Is there any alternate way to do this.? So that I can create thread specific log.

  2. #2
    travishein's Avatar
    travishein is offline Senior Member
    Join Date
    Sep 2009
    Rep Power


    wow, thread specific log would be neat.

    I sometimes used to add the "%t" output format option (see PatternLayout (Apache Log4j 1.2.15 API) )
    Used to output the name of the thread that generated the logging event.[/quote]

    And then, when each log line is tagged with the [thread-1] [main-thread], etc. thread name, I would have to manually post-process and sort the log file to only show, or exclude lines that were of specific threads. Such command line tools as
    Java Code:
      cat log_output.txt | grep "thread-1" > thread1_log.txt
      cat log_output.txt | grep -v "main-thread" > all_except_main_thread_log.txt
    Not very helpful for realtime or immediate thread-specific log outputs.

    other than the manual log setup stuff you are doing inside the thread like you are doing, I think its possible they don't readily do a thread specific log file facility, is the threads can vary , and can be created and destroyed through out the lifetime of the application, and possibly when a thread is created it could eventually have the same name as before and this would clobber or wrongfully append to an existing thread log file.

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