Use of BasicConfigurator in Log4j logging
log4j warning
log4j: WARN No appenders could be found for logger (org.activemq.transport.tcp.TcpTransportChannel).
log4j: WARN Please initialize the log4j system properly.
If you are getting foregoing log4j warn debug info, that means you have
not initialized log4j properly. So In this part of tutorial we will tell you how to
configure log4j using BasicConfigurator.
Now lets see when this log4j warning occurs.
We
are creating only SimpleLog file without
configuring it as:
import org.apache.log4j.*;
public class SimpleLog {
static Logger logger = Logger.getLogger("SimpleLog.class");
public static void main(String[] args) {
logger.debug("Hello world.");
}
}
|
After running the example we have got following log4j
warning flashing on command prompt:
|
log4j:WARN No appenders
could be found for logger (SimpleLog.class).
log4j:WARN Please initialize the log4j system properly. |
It is because we don't have
configured Log4j. There are many different ways of configuring Log4j. One
way is through BasicConfigurator. This can be done as follows:
import org.apache.log4j.*;
import org.apache.log4j.BasicConfigurator;
public class SimpleLog {
static Logger logger = Logger.getLogger("SimpleLog.class");
public static void main(String[] args) {
BasicConfigurator.configure();
logger.debug("Hello world.");
}
}
|
Now after running this code you will get the following
output on your console:
Output:
| 0 [main] DEBUG
SimpleLog.class - Hello world. |
where "0" shows time taken in
milliseconds from start of program to the logging request. "Hello
world" is the message that we have given.
SimpleLog.class is the logger name and in bracket [main] is the
thread who have invoked logging.
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