Re: [logback-user] SMTPAppender with level WARN?

20 Oct 2008

      Hello Ceki,

Thanks a lot for the very quick reply!

You were right: the output contained an ERROR: 'Mandatory "name" 
attribute not set for <evaluator>'.

The name-attribute is *not* mentioned in your CounterBasedEvaluator 
example in your Appender documentation:

http://logback.qos.ch/manual/appenders.html#SMTPAppender

And I couldn't find a XSD- or a DTD-file for the logback configuration.

Now I added the name-attribute, but I get a different ERROR:

Evaluator of type [packagename.AlwaysTrueEvaluator] is not of the 
desired type

Again, I based my code on your CounterBasedEvaluator example. Any ideas?

Thanks again, Joop.

On 10/20/2008 10:16 PM, Ceki Gulcu wrote:
...
Hello Joop,
Just after creating a/any logger, invoke the following method
LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
StatusPrinter.print(lc);
I *bet* the output will tell you went wrong.
HTH,
Joop Vriend wrote:
...
Hi,
I'm trying to configure logback with an SMTPAppender that mails *every*
log message of level WARN or higher, but I can't get it working.
I've tried to use a (Threshold)filter, but that didn't work. (Why can't
you just use filters with SMTPAppender?!?)
I've tried to use an EvaluatorFilter with an expression 'level >= WARN',
but that didn't work either.
Now I'm trying to use a custom evaluator, but still can't get it
working... :-(  Level ERROR is being e-mailed, but other levels not.
For testing purposes I (even) wrote a custom evaluator-class that always
returns 'true' in it's evaluate()-method:
public class AlwaysTrueEvaluator extends ContextAwareBase implements
EventEvaluator
{
   String  name;
   boolean started;
public boolean evaluate(Object event) throws NullPointerException,
EvaluationException
   {
     return true;
   }
public void setName(String name)
   {
     this.name = name;
   }
public String getName()
   {
     return name;
   }
public boolean isStarted()
   {
     return started;
   }
public void start()
   {
     started = true;
   }
public void stop()
   {
     started = false;
   }
}
This is my logback.xml file:
<configuration>
<appender name="RootFileAppender"
class="ch.qos.logback.core.rolling.RollingFileAppender">
     <append>true</append>
     <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
       <level>debug</level>
     </filter>
     <rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${catalina.base}/logs/logback-root.%d{yyyy-MM-dd}.log.gz</fileNamePattern>
     </rollingPolicy>
     <layout class="ch.qos.logback.classic.PatternLayout">
       <pattern>%date{yyyy-MM-dd HH:mm:ss}  %class %method
\(%file:%line\)%n  %level: %message%n</pattern>
     </layout>
   </appender>
<appender name="RootEmailAppender"
class="ch.qos.logback.classic.net.SMTPAppender">
     <bufferSize>1</bufferSize>
     <SMTPHost>_SMTP_HOST_</SMTPHost>
     <to>_TO_ADDRESS_</to>
     <from>_FROM_ADDRESS_</from>
     <subject>logback logrecord</subject>
     <layout class="ch.qos.logback.classic.PatternLayout">
       <pattern>%date{yyyy-MM-dd HH:mm:ss}  %class %method
\(%file:%line\)%n  %level: %message%n</pattern>
     </layout>
     <evaluator class="packagename.AlwaysTrueEvaluator"/>
   </appender>
<root>
     <level value ="debug"/>
     <appender-ref ref="RootFileAppender"/>
     <appender-ref ref="RootEmailAppender"/>
   </root>
</configuration>
I'm using logback 0.9.9 with slf4j 1.5.5 on Tomcat 6.0.
Any help is greatly appreciated!
Kind regards, Joop Vriend.