问题:

I am using a third party library (cannot modify it) that uses for logging system.out.println statements. The output shows fine in the console but I am not able to retrieve those information in the catalina[...].log file?

Is it possible to send those to log4j?

回答1:

System.out.println() prints out to stdout. Therefore, if you want to see these statements in a log file, you can just redirect stdout where you want it in the Tomcat startup script.

回答2:

When running Tomcat on unixes, the console output is usually redirected to the file named catalina.out. The name is configurable using an environment variable. (See the startup scripts).

http://tomcat.apache.org/tomcat-7.0-doc/logging.html#Console

回答3:

If you are running a JSP then you need to add

 <%@ page isThreadSafe="false"  %>

Then all of your System.out.printlns will start showing up in the catalina.out file.

If you start tomcat with Catalina.sh run from a command line you will see the prints in the output.

回答4:

You can find those logs also in cat /var/log/messages

if you try

cat /var/log/messages | grep server

回答5:

You can find it inside TOMCAT_HOME/logs/stdout_20130104.txt (the file name may change but the log files are usually in the folder TOMCAT_HOME/logs/.

And for me all the sysouts that I have in my code are written in such a file.