hi,
I ran the following code. In it, I make three threads and in each of them, I
get a Logger object, add a ConsoleAppender and then log three items. The
idea, as you can no doubt tell, is to mimick using a class with logging in
it within a multithread environment.
I would have hoped to have gotten nine logging messages (three logging calls
within each of three threads). Instead, I typically get 21 messages with
some duplicates.
The reason, of course, is that the logger.info() calls are appending to all
of the appenders attached at that time to the logger in all of the threads.
Any ideas for a work-around?
thanks!
===========
import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
public class MultiThreadTest
{
public static void main(String[] args)
{
for (int i=0; i<3; i++)
{
TestThread tt = new TestThread(i);
tt.start();
}
}
}
class TestThread extends Thread
{
private int threadID;
TestThread(int id)
{
threadID = id;
}
public void run()
{
Logger logger = Logger.getLogger("MultiThreadTest");
ConsoleAppender cAppender = new ConsoleAppender(new PatternLayout());
logger.addAppender(cAppender);
for (int i=0; i<3; i++)
{
logger.info("item"+threadID+":"+i);
}
}
}
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