Log4j
Configuration:
Configuring log4j involves assigning
the LEVEL,defining Appender, and specifying Layout objects in a configuration
file.
1)BasicConfigurator
2)PropertyConfigurator
3)DomConfigurator
BasicConfigurator:
If are
do not create a property file or xml file for log4j properties then we use BasicConfigurator class.
The
BasicConfigurator.configure() method by default it uses the Console Appender and Pattern Layout for log
statements.
Program:
package com.dustbin.test;
import org.apache.log4j.Logger;
public class Sample {
static Logger logger=Logger.getLogger(Sample.class);
public static void main(String[] args) {
logger.info("info message");
logger.warn("warn message");
logger.error("error message");
logger.fatal("fatal message");
logger.debug("debug msg");
}
}
Output:
We got an exception like…
log4j:WARN No appenders
could be found for logger (com.dustbin.test.Sample).
log4j:WARN Please
initialize the log4j system properly.
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