how to increase log level in tomcat 5.0.28

[Krishna Chaitanya Reddy Balam]

We had a unwanted shut down of tomcat 5.0.28 recently and nothing is ever traced in logs can some one suggest a way to increase the level of logging in this particular tomcat.

[Krishna Chaitanya Reddy Balam]

these are the contents of log4j in webapps

log4j.rootLogger=INFO, R

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=vgn-tas.log

log4j.appender.R.MaxFileSize=1000KB
# Keep one backup file
log4j.appender.R.MaxBackupIndex=10

log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=[%d{ISO8601}][%p][%c] - %m%n