log4j - multiple logs in one class

I have a problem with multiple logs in one class.
The problem is that the logs are being written, but then when the program is done, the files are being erased (contain nothing). I can see the log files fill up as the program goes along, so I know stuff is being written.

     FileAppender appender1 = null;
     try {
       myAppender1 = new FileAppender("file1.log",false);
     } catch(Exception e) {}

     logger1.addAppender(appender1);
     logger1.setLevel((Level) Level.INFO);
     
     FileAppender appender2 = null;
     try {
       myAppender2 = new FileAppender("file2.log",false);
     } catch(Exception e) {}

     logger2.addAppender(appender2);
     logger2.setLevel((Level) Level.INFO);