Thanks Ron: Thank you for your reply and I really appreciate it.
May be The getRenderedMessage method in the LoggingEvent is another place that I can intercept the log message. But I'm just beginning to look how to use log4j and I need to do some more research to find out how do I overwrite the getRenderedMessage method to scan and pre-process the message. Can I extend the LoggingEvent and do something to have log4j use my child LoggingEvent method so that I can do what I need to do with the message. What I really need to do is to create a utilities to be used to plug in to the application code so that all the log message can be scanned/pre-processed before sending to the Appender. And of course the application code need to do the little the better. I'm sure the added <renderer> tag in my log4j.xml is loaded in my server but what I don't understand is that the doRender method is not get called. Could that be because a String object is been bypassed because it's already a String so that there is no need to render it again? I thought the doRender(object o) will catch all the object. Is this right? It this doRender approach the deadend to intercept the message or I can still catch a String object in doRender? I have changed the renderedClass="java.lang.Object" to Object instead of String but it's the same thing doRender method print statement can't be found in my consoleAppender. <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"; debug="true"> <renderer renderedClass="java.lang.Object" renderingClass="test.log4j.LogCatcher"/> Here's the ocnsole log that shows the new <renderer> tag showned in the logger. [6/1/07 15:28:09:453 EDT] 0000002a SystemOut O log4j: Rendering class: [test.log4j.LogCatcher], Rendered class: [java.lang.Object]. [6/1/07 15:28:09:453 EDT] 0000002a SystemOut O log4j: Level value for root is [debug]. [6/1/07 15:28:09:453 EDT] 0000002a SystemOut O log4j: root level set to DEBUG [6/1/07 15:28:09:469 EDT] 0000002a SystemOut O log4j: Class name: [org.apache.log4j.ConsoleAppender] [6/1/07 15:28:09:500 EDT] 0000002a SystemOut O log4j: Setting property [threshold] to [DEBUG]. [6/1/07 15:28:09:500 EDT] 0000002a SystemOut O log4j: Parsing layout of class: "org.apache.log4j.PatternLayout" [6/1/07 15:28:09:657 EDT] 0000002a SystemOut O log4j: Setting property [conversionPattern] to [%d %-5p [%t] %C{2} (%F:%L) - %m%n]. [6/1/07 15:28:09:657 EDT] 0000002a SystemOut O log4j: Adding appender named [STDOUT] to category [root]. [6/1/07 15:28:09:672 EDT] 0000002a ServletWrappe A SRVE0242I: [TestCsfEAR] [/x] [EntitlementServlet]: Initialization successful. [6/1/07 15:28:09:704 EDT] 0000002a SystemOut O 2007-06-01 15:28:09,704 ERROR [WebContainer : 1] log4j.EntitlementServlet (EntitlementServlet.java:59) - log this info !!@@##$$%%^^&&**()++ --- "Gallagher, Ron" <[EMAIL PROTECTED]> wrote: > Naider -- > > The purpose of Renderers is to generate a String > representation of an > Object. Since a String is already a String, there's > no need to do any > additional rendering. > > The getRenderedMessage method in the LoggingEvent is > what is responsible > for calling any defined renderers. This method has > an explicit check > for situations where the object that's about be > rendered is an instance > of String. In that case, the Object to render is > simply cast into a > String and used as-is. > > > Ron Gallagher, AT&T Mobility > > > -----Original Message----- > From: Naider Chen [mailto:[EMAIL PROTECTED] > Sent: Thursday, May 31, 2007 5:26 PM > To: Log4J Users List > Subject: Unable to call doRender. Am I missing > anything? > > I'm trying to intercept the logging message to > filter > some keyword before forwarding to the destination. > I > tested it in a windows environment using RAD6 > > I add the new <renderer> tag entry to log4j.xml and > put both log4j.dtd and log4j.xml in the > WEB-INF/classes folder but after I re-compile and > bounce the server the doRender method was never get > called. > > Am I missing snything? Please help. Thanks. > > <renderer renderedClass="java.lang.String" > renderingClass="test.log4j.LogCatcher"/> > > I create a new class test.log4j.LogCatcher as > follows: > > package test.log4j; > import org.apache.log4j.*; > import org.apache.log4j.spi.*; > import org.apache.log4j.or.ObjectRenderer; > > public class LogCatcher implements ObjectRenderer { > > public String doRender(Object arg0) { > String st = arg0.toString(); > System.out.println("LogCatcher doRender ********** > log string catched = *" + st + "*"); > return st; > } > } > > ALWAYS THERE FOR YOU!!! > Naider Chen > EMAIL ME ANYTIME!!!! > > > > > > ________________________________________________________________________ > ____________ > Choose the right car based on your needs. Check out > Yahoo! Autos new > Car Finder tool. > http://autos.yahoo.com/carfinder/ > > --------------------------------------------------------------------- > To unsubscribe, e-mail: > [EMAIL PROTECTED] > For additional commands, e-mail: > [EMAIL PROTECTED] > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: > [EMAIL PROTECTED] > For additional commands, e-mail: > [EMAIL PROTECTED] > > ALWAYS THERE FOR YOU!!! Naider Chen EMAIL ME ANYTIME!!!! ____________________________________________________________________________________ Moody friends. Drama queens. Your life? Nope! - their life, your story. Play Sims Stories at Yahoo! Games. http://sims.yahoo.com/ --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
