How to implement Log in Selenium (Using Log4j)

-> During the Automation Execution users need some information about the Execution steps in console.

-> We need information which helps the users to understand the testcase or any failure during the testcase execution.

-> With the help of Log4j its possible to enable logging in selenium testcase.


Follow the below steps to implement logs


1) Log4j Download

Download Log4j by using this link -> https://logging.apache.org/log4j/1.2/download.html

2) Create Log4j.properties file

-> Log4j.properties file for display log message only in console

# Root logger option
log4j.rootLogger=INFO,stdout

# 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


->Log4j.propertiesfiles for display log message only in file

# Root logger option
log4j.rootLogger=INFO,file

# Redirect log messages to a log file, support file rolling.
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./Log/log_${current.date}.log
log4j.appender.fileout.Append=false
log4j.appender.file.MaxFileSize=5MB
log4j.appender.file.Append=false
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


->Log4j.propertiesfiles for display log message in both console and File

# Root logger option
log4j.rootLogger=INFO,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=./Log/log_${current.date}.html
log4j.appender.fileout.Append=false
log4j.appender.file.MaxFileSize=5MB
log4j.appender.file.Append=false
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


-> Load properties file in Main()


Initial Environment variable (Current.date) which is used in Log4j.properties file and load Log4j.properties file.

SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd hh_mm_ss");
        System.setProperty("current.date", dateFormat.format(new Date()));
       
           PropertyConfigurator.configure("C:/Selenium/log4j.properties");
          


-> create log for required class files



public class Login {
   
    final static Logger logger = Logger.getLogger(Login.class);

public static boolean LoginGmail(){

logger.info("Information Message");
logger.debug("Warning Message");
logger.error("Error Message");
}

}


-> Best practise for use logger

logger.info = Instead of Sysout we can use looger.info
logger.debug = use inside of conditional Statments and looping statments.
logger.error =  use inside catch block.


-> LoGGER Level

See the link for logger level ->  http://arunrajvdm.blogspot.in/2016/12/log4j-how-to-disable-all-log-details.html