Problem Definition: There are times in multi-threaded java programming when you see duplicate messages in your log files.
What was I doing wrong: I had setup the logging infrastructure in a super class that all logging classes would extend. Everytime I was instantiating a class that would log it would initialize the logging infrastructure for itself. And everytime it did so it would add another Appender(log4j)/Handler(JUL) to the Logger class.
What is the resolution: Do this in the log setup code(specific for log4j):
Logger logger = Logger.getLogger("
Enumeration appenders = logger.getAllAppenders();
if (!appenders.hasMoreElements()) {
//initialize an Appender class
//Add the appender object to the logger
}
When I was doing it wrongly, I did not have the if block. Hope you would benefit from this piece of wisdom :)
