Log4j and multiple loggers/appenders

Question

Hello,
I have a class that is instantiated multiple times. Each instance needs to write to a separate file which has to be rolled daily.
The example below instantiates SubClass twice; both log files are created successfully -2007-05-09_sc1.log and 2007-05-09_sc2.log-, but the output goes only to 2007-05-09_sc2.log with the following:
09 May 2007 15:00:05,953 INFO [sc2] - writing to class sc1
09 May 2007 15:00:05,953 INFO [sc2] - writing to class sc2
... while 2007-05-09_sc1.log is empty.
Could someone please point out what am I doing wrong?
Thanks in advance.
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
import org.apache.log4j.rolling.RollingFileAppender;
import org.apache.log4j.rolling.TimeBasedRollingPolicy;
public class LogTest
    public static void main(String[] args)
        SubClass sc1 = new SubClass("sc1");
        SubClass sc2 = new SubClass("sc2");
        sc1.writeToLog("writing to class sc1");
        sc2.writeToLog("writing to class sc2");
class SubClass
    private String name;
    private static Logger log;
    public SubClass( String name )
        this.name = name;
        // Create policy
        TimeBasedRollingPolicy policy = new TimeBasedRollingPolicy();
        policy.setFileNamePattern("logs/%d{yyyy-MM-dd}_" + name + ".log.zip");
        policy.activateOptions();
        // Create the appender
        RollingFileAppender appender = new RollingFileAppender();
        appender.setLayout(new PatternLayout("%d{DATE} %-5p [" + name+ "] - %m%n"));
        appender.setRollingPolicy(policy);
        appender.activateOptions();
        // Create logger
        log = Logger.getLogger("SubClass." + name);
        log.addAppender(appender);
    public void writeToLog( String txt )
        log.info(txt);
}

Answer 1

Here's my test version that works correctly:class SubClass {
  private Logger log;
  public SubClass(String name) {
    // Create the appender
    RollingFileAppender appender = new RollingFileAppender();
    appender.setLayout(new PatternLayout("%d{DATE} %-5p [" + name
                    + "] - %m%n"));
    appender.setFile("C:/temp/" + name + ".txt");
    appender.activateOptions();
    // Create logger
    log = Logger.getLogger("SubClass." + name);
    log.addAppender(appender);
  public void writeToLog(String txt) {
    log.info(txt);
}I don't have this "policy" business in my version of Log4J so I simplified your code a bit. My version produces two different log files with one line in each file.