<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class LoggerExample {
private static final Log LOGGER = LogFactory.getLog(LoggerExample.class);
public void exampleMethod() {
LOGGER.debug("This is a debug message.");
LOGGER.info("This is an info message.");
LOGGER.warn("This is a warning message.");
LOGGER.error("This is an error message.");
LOGGER.fatal("This is a fatal message.");
}
}
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
log4j.rootLogger=DEBUG, console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}.%M():%L - %m%n
public static void main(String[] args) {
LoggerExample example = new LoggerExample();
example.exampleMethod();
}
2022-01-01 12:00:00 DEBUG LoggerExample.exampleMethod():7 - This is a debug message.
2022-01-01 12:00:00 INFO LoggerExample.exampleMethod():8 - This is an info message.
2022-01-01 12:00:00 WARN LoggerExample.exampleMethod():9 - This is a warning message.
2022-01-01 12:00:00 ERROR LoggerExample.exampleMethod():10 - This is an error message.
2022-01-01 12:00:00 FATAL LoggerExample.exampleMethod():11 - This is a fatal message.
