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SMTPAppender EvaluatorClass Option

SMTPAppender EvaluatorClass Option

2004-01-21       - By Charles Hudak

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Reply:     1     2  

Sure, here is my config:

<!-- The SMTP appender -->
   <appender name="smtp_viol" class="org.apache.log4j.net.SMTPAppender Source code of org.apache.log4j.net.SMTPAppender">
       <param name="EvaluatorClass"
value="com.arrow.logging.CountingTriggeringEventEvaluator"/>
       <param name="BufferSize" value="25"/>
       <param name="From" value="you@(protected)"/>
       <param name="To" value="me@(protected)"/>
       <param name="Subject" value="Converter Mapping Error"/>
       <param name="SMTPHost" value="@(protected)@"/>
       <layout class="org.apache.log4j.PatternLayout Source code of org.apache.log4j.PatternLayout">
           <param name="ConversionPattern" value="%d [%t][%p] - %m%n"/>
       </layout>
   </appender>

Then the class:

package com.arrow.logging;

import org.apache.log4j.spi.LoggingEvent Source code of org.apache.log4j.spi.LoggingEvent;
import org.apache.log4j.spi.TriggeringEventEvaluator Source code of org.apache.log4j.spi.TriggeringEventEvaluator;

public class CountingTriggeringEventEvaluator implements
TriggeringEventEvaluator
{
   private static final int MAX_COUNTER = 25;
   private int counter = 0;

   public boolean isTriggeringEvent(LoggingEvent parm1)
   {
       return ((++counter % MAX_COUNTER) == 0);
   }

}

Your problem is probably a classpath issue.

-- --Original Message-- --
From: James Noble [mailto:JamesN@(protected)]
Sent: Wednesday, January 21, 2004 10:44
To: Log4J Users List
Subject: SMTPAppender EvaluatorClass Option


Has anyone successfully used the SMTPAppender EvaluatorClass option? When I
try to use my own evaluator class I get these error messages:

   log4j:ERROR Could not instantiate class [my.package.TriggerOnWarn].
   java.lang.ClassNotFoundException Source code of java.lang.ClassNotFoundException: my.package.TriggerOnWarn
       [stack trace...]

TriggerOnWarn is implemented as follows:

   package my.package;

   import org.apache.log4j.Level Source code of org.apache.log4j.Level;
   import org.apache.log4j.spi.LoggingEvent Source code of org.apache.log4j.spi.LoggingEvent;
   import org.apache.log4j.spi.TriggeringEventEvaluator Source code of org.apache.log4j.spi.TriggeringEventEvaluator;

   public class TriggerOnWarn implements TriggeringEventEvaluator {

       public boolean isTriggeringEvent( LoggingEvent event ) {
           return event.getLevel().isGreaterOrEqual( Level.WARN );
       }

   }

Besides implementing the TriggeringEventEvaluator interface, does the
evaluator class have to be a subclass of a particular class or in the
org.apache.log4j package?

Thanks!
Jim

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