AVAJAVA Web Tutorials

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After doing this, when I started up my web app, I received the following console output.

Console Output

Log4JInitServlet is initializing log4j
Initializing log4j with: C:\projects\workspace\log4j-webapp-demo\web\WEB-INF/log4j.properties
0    [main] INFO  org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/balancer]  - org.apache.webapp.balancer.BalancerFilter: init(): ruleChain: [org.apache.webapp.balancer.RuleChain: [org.apache.webapp.balancer.rules.URLStringMatchRule: Target string: News / Redirect URL: http://www.cnn.com], [org.apache.webapp.balancer.rules.RequestParameterRule: Target param name: paramName / Target param value: paramValue / Redirect URL: http://www.yahoo.com], [org.apache.webapp.balancer.rules.AcceptEverythingRule: Redirect URL: http://jakarta.apache.org]]
453  [main] INFO  org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/jsp-examples]  - ContextListener: contextInitialized()
453  [main] INFO  org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/jsp-examples]  - SessionListener: contextInitialized()
719  [main] INFO  org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/servlets-examples]  - ContextListener: contextInitialized()
719  [main] INFO  org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/servlets-examples]  - SessionListener: contextInitialized()
1015 [main] INFO  org.apache.coyote.http11.Http11BaseProtocol  - Starting Coyote HTTP/1.1 on http-8080
1297 [main] INFO  org.apache.jk.common.ChannelSocket  - JK: ajp13 listening on /0.0.0.0:8009
1312 [main] INFO  org.apache.jk.server.JkMain  - Jk running ID=0 time=0/47  config=null
1375 [main] INFO  org.apache.catalina.storeconfig.StoreLoader  - Find registry server-registry.xml at classpath resource
1578 [main] INFO  org.apache.catalina.startup.Catalina  - Server startup in 2735 ms

Notice the results. No TomcatSW INFO messages are displayed before the web application's log4j initialization servletW is hit since the root logger is set to ERROR. However, the init servlet changes the logging level to INFO, so the Tomcat INFO messages after this point in execution are displayed.

Is it possible to remove these Tomcat INFO messages? Sure. One way to do this is to add the following to our log4j.properties file in the 'tomcat-log4j' folder:

log4j.logger.org.apache=ERROR

That line says that if a class is within the org.apache package, it's logging level is set to ERROR. This is shown below.

# This sets the global logging level and specifies the appenders
log4j.rootLogger=ERROR, myConsoleAppender

# settings for the console appender
log4j.appender.myConsoleAppender=org.apache.log4j.ConsoleAppender
log4j.appender.myConsoleAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.myConsoleAppender.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

log4j.logger.org.apache=ERROR

If we now start up our application after this latest change, we see the following console output:

Console Output

Log4JInitServlet is initializing log4j
Initializing log4j with: C:\projects\workspace\log4j-webapp-demo\web\WEB-INF/log4j.properties

Suppose we don't want to totally eliminate all the messages. Let's still display the message that reports on how long it takes Tomcat to start up. We can do this by adding the following to the log4j.properties file in the 'tomcat-log4j' folder:

log4j.logger.org.apache.catalina.startup=INFO

This is shown below.

# This sets the global logging level and specifies the appenders
log4j.rootLogger=ERROR, myConsoleAppender

# settings for the console appender
log4j.appender.myConsoleAppender=org.apache.log4j.ConsoleAppender
log4j.appender.myConsoleAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.myConsoleAppender.layout.ConversionPattern=%-4r [%t] %-5p %c %x - %m%n

log4j.logger.org.apache=ERROR
log4j.logger.org.apache.catalina.startup=INFO

Now, if we run our web application, we see the following in our console output:

Console Output

0    [main] INFO  org.apache.catalina.startup.Catalina  - Initialization processed in 922 ms
Log4JInitServlet is initializing log4j
Initializing log4j with: C:\projects\workspace\log4j-webapp-demo\web\WEB-INF/log4j.properties
2297 [main] INFO  org.apache.catalina.startup.Catalina  - Server startup in 2297 ms

As we've seen, it's possible configure the Tomcat start-up information that's displayed to the console when running the Tomcat bootstrap from within EclipseSW. I'm not really sure why the latest commons-logging jarW file isn't shipped with Tomcat. There is a commons-logging-api jar file within the Tomcat bin/ directory in my version of Tomcat, but it's obviously a bit different from the commons-logging jar file that I added to my project's build path.