Log4j with Maven
1. Add dependency.
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
2. Add log4j.properties file inside "src/main/java" package (Because when we are building the project this file will reside in /target/classes, you can select any package which is a java build path source )
#
Root logger option
log4j.rootLogger=DEBUG,
stdout,
file
#
Redirect log messages to console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd
HH:mm:ss}
%-5p
%c{1}:%L
- %m%n
#
Redirect log messages to a log file, support file rolling.
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=GIVE_PATH_FOR_LOGFILE
log4j.appender.file.MaxFileSize=5MB
log4j.appender.file.MaxBackupIndex=10
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd
HH:mm:ss}
%-5p
%c{1}:%L
-
%m%n
3.
Main function
import
org.apache.log4j.Logger;
import
org.apache.log4j.PropertyConfigurator;
public
class
LogMain {
final
static
Logger logger
= Logger.getLogger(LogMain.class);
public
static
void
main(String[] args) {
logger.debug("test
debug");
logger.error("test
error");
}
}
4.
Run !!
You
will get this in “GIVE_PATH_FOR_LOGFILE”
2015-02-23
15:42:39 DEBUG LogMain:12 - test debug
2015-02-23
15:42:39 ERROR LogMain:13 - test error
