определить файл свойств log4j
@ prueba.java
import org.apache.log4j.Logger;
public class prueba {
private static Logger LOGGER = Logger.getLogger(prueba.class);
public static void main(String[] args) {
LOGGER.debug("This is Debug");
...
}
}
@ pom.xml
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>RELEASE</version>
<scope>compile</scope>
</dependency>
в src/resources/log4j.properties
# Root logger option
log4j.rootLogger=DEBUG, file, stdout
# Direct log messages to stdout
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
# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=log/log4j-application.log
log4j.appender.file.MaxFileSize=10MB
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
вывод в stdout
и log/log4j-application.log
файл
2018-05-11 14:29:43 DEBUG prueba:8 - This is Debug
2018-05-11 14:29:43 INFO prueba:9 - This is Info
2018-05-11 14:29:43 WARN prueba:10 - This is Warn
2018-05-11 14:29:43 ERROR prueba:11 - This is Error
2018-05-11 14:29:43 FATAL prueba:12 - This is Fatal