To show the log in both console and file create log4j.properties file on scr folder then paste the following code inside the properties file.
log4j.rootLogger=DEBUG,console, FILE
log4j.appender.FILE=org.apache.log4j.FileAppender
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.Target=System.out
log4j.appender.console.layout.conversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p - %m%n
log4j.appender.FILE.File=log.out
log4j.appender.FILE.ImmediateFlush=true
log4j.appender.FILE.Threshold=debug
log4j.appender.FILE.Append=false
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.conversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p - %m%n
Location of the file can be changed by
log4j.appender.FILE.File = ...