Jeesch, Dr. Evil, I gave you a logger that does fancier logging and has no
setup. You didn't like it? It also has simpler code in the class. And, it
does automatic type identification on the fly. Whatchawant? ;-)
-----Original Message-----
From: Dr. Evil <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Date: Saturday, October 20, 2001 4:14 AM
Subject: Logging solution is complicated (was Re: Debugging in Tomcat 4)
>
>Ok, I figured out how to get log4j to work with Tomcat in a
>reasonable, although complicated, way:
>
>Download the log4j files, and copy the .jar files into
>TOMCAT_HOME/libs, otherwise servlets can't find them.
>
>First, compile a servlet called startlogging.java, in the classes
>directory:
>
>----------------------
>// start logging functions
>import java.io.*;
>import javax.servlet.*;
>import javax.servlet.http.*;
>import org.apache.log4j.PropertyConfigurator;
>
>public class startlogging extends HttpServlet {
>
> public void init() throws ServletException {
>
PropertyConfigurator.configure("/usr/local/jakarta-tomcat-4.0/webapps/myapp/
WEB-INF/classes/log4j.properties");
> // or wherever your properties file is
> }
>
>}
>----------------------
>
>Then, put this in the web.xml file:
>
>----------------------
> <servlet>
> <servlet-name>startlogging</servlet-name>
> <servlet-class>startlogging</servlet-class>
> <load-on-startup>1</load-on-startup>
> </servlet>
>----------------------
>
>I put it as my first servlet entry in the file. Order is important in
>that file.
>
>Then, create the log4j.properties file, in the classes directory:
>
>----------------------
># Set root category priority to DEBUG and its only appender to A1.
>log4j.rootCategory=DEBUG, A1
>
># A1 is set to be a ConsoleAppender.
>#log4j.appender.A1=org.apache.log4j.ConsoleAppender
>log4j.appender.A1=org.apache.log4j.FileAppender
>
># set up the filename - change as appropriate
>log4j.appender.A1.File=/tmp/test.log
>
># A1 uses PatternLayout.
>log4j.appender.A1.layout=org.apache.log4j.PatternLayout
>log4j.appender.A1.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n
>----------------------
>
>Finally, in classes that you want to log from:
>
>----------------------
>class myclass {
>
> static Category cat = Category.getInstance(userinfo.class);
>
> public void mymethod() {
> .....
> cat.info("This is an info log entry.");
>----------------------
>
>and then it will log to the file you specified in the log4j.properties
>file. That's a lot of complexity to get a line into a file, but
>whatever, it's better than trying to figure out what's going on by
>looking at html output from a servlet...
>
>The other problem here is that it uses the FileAppender method from
>the log4j package. I'm not sure what's wrong with this method, but
>they say it is depracated, slated for removal, and there doesn't seem
>to be any replacement for it. Sometimes all you want is to put a line
>in a file. When you can't figure out what's going on, nothing is
>better than falling back on a good old printf("we're here\n");. I am
>glad to here that java 1.4 is getting an assert() facility. Maybe a
>log() facility would be another good addition to that.
>
