How to add logger log4j in Selenium Test?

1. Add below dependency in pom.xml file:

        <dependency>

            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>

        </dependency>

You can find the latest dependency from Apache Maven repo

2. Create log4j.properties file and add below content:

log4j.rootLogger=INFO, FA, stdout
#File Appender
log4j.appender.FA=org.apache.log4j.FileAppender
log4j.appender.FA.File=log/AppLog.log
log4j.appender.FA.layout=org.apache.log4j.PatternLayout
log4j.appender.FA.layout.ConversionPattern=%-4r [%t] %-5p %d{dd MMM yyyy HH:mm:ss} %c %x - %m%n

#Log to Console as 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 %3x - %m%n

#Log to file FILE
#log4j.appender.file=org.apache.log4j.DailyRollingFileAppender
#log4j.appender.file.File=logfile.log
#log4j.appender.file.DatePattern='.'yyyy-MM-dd
#log4j.appender.file.append=true
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c %3x - %m%n

3. Setup and configure log4j property file in java class:

PropertyConfigurator.configure("YOUR_LOG4J_PROPERTY_FILEPATH");

Get you current class name in logger log4j using Java

Log4j is very important utility for debugging error in Java code. This low level utility will give the exact class, method and line where error is occurred.

Just declare the below line in Base class which is extended by child class

public final Logger logger = Logger.getLogger(this.getClass().getSimpleName());

Eg:
In my com.aut.AppTest.java
logger.info("this line is to debug java code");

OUTPUT
2015-12-29 16:45:32 INFO  AppTest     - this line is to debug java code

Now if getSimpleName() is replace by getName() the logger will log details of package as well.