The following log4j.properties uses a relative path for redirected file. Is it valid?
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=./output.log
log4j.appender.file.MaxFileSize=10MB
log4j.appender.file.MaxBackupIndex=5
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L -
%m%n
