Specify only some packages to have debug output

问题:

I want to log some behavior of my web application which also implements hibernate, spring and so on. When I tried to implement log4j logger from apache I had some troubles.

When I turn on logger it is also debugging hibernate and spring which I don't want. I tried to configure properties file to the specify the package of my project but it does not work.

Here is my code of property file:

log4j.rootCategory=ERROR, O
log4j.category.com.my.package= DEBUG, FILE, O
log4j.appender.FILE=org.apache.log4j.RollingFileAppender
log4j.appender.FILE.File=log/logger.log
log4j.appender.O=org.apache.log4j.ConsoleAppender
.... and some layout

It works when I switch rootCategory = DEBUG but it is also debugging the hibernate and spring as I said.

回答1:

Yes, you have to specfiy the log level per package:

log4j.logger.org.hibernate=info
log4j.logger.org.springframework=info
log4j.logger.com.yourapplication=debug

Note that you should switch from categories (obsolete) to loggers. So log4j.rootLogger=...

回答2:

You would need to know the name of the loggers that are actually writing stuff... The simplest way is to set the root category to error:

log4j.rootCategory=ERROR, 0

Then set the level for your logs accordingly:

log4j.com.your.package=DEBUG...

Setting the rootCategory to DEBUG will turn everything to DEBUG, unless you specifically configure a logger otherwise.

B.T.W, this is NOT a hibernate issue, this is related to how you are configuring your logger.