Why isn't this code writing log output on my Tridion Content Delivery server? - tridion

Question

I have a user control rendering content from a custom (non-Tridion) database. The connection string for this custom database is incorrect, and so I'm getting an SqlException when the code tries to connect.
My code is currently:
var logger =
Tridion.ContentDelivery.Web.Utilities
.LoggerFactory.GetLogger(this.GetType().ToString());
try
{
/* make a database connection - failing with SqlException */
}
catch (SqlException e)
{
logger.Error("Could not connect to database: " + e.ToString());
}
My \bin\config\logback.xml file contains:
<property name="log.pattern" value="%date %-5level %logger{0} - %message%n"/>
<property name="log.history" value="7"/>
<property name="log.folder" value="c:/tridion/log"/>
<property name="log.level" value="DEBUG"/>
...
<appender name="rollingCoreLog" class="ch.qos.logback.core.rolling.RollingFileAppender">
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${log.folder}/cd_core.%d{yyyy-MM-dd}.log</fileNamePattern>
<maxHistory>${log.history}</maxHistory>
</rollingPolicy>
<encoder>
<pattern>${log.pattern}</pattern>
</encoder>
<prudent>true</prudent>
</appender>
...
<root level="warn">
<appender-ref ref="rollingCoreLog"/>
</root>
There's a stack of logs in C:\Tridion\log, but the most recently changed one was modified 20 minutes ago, and doesn't contain my log message text (I just did a search for "database" in notepad).
Why isn't my log output being sent to the log?

Answer 1

You have 2 options:
You define the root logging to "DEBUG" but this has the disadvantage that allows a huge amount of logging from all the third-party libraries that Tridion is using. Here is the snippet: <root level="DEBUG"> <appender-ref ref="rollingCoreLog"/> </root>
You define a special appender to include also the Tridion .NET logging: <logger name="Tridion.ContentDelivery" level="${log.level}"><appender-ref ref="rollingCoreLog"/></logger>
Note that in the second case you need your logger to be bound to a namespace under Tridion.ContentDelivery. Here is an example:
var logger =
Tridion.ContentDelivery.Web.Utilities.LoggerFactory.GetLogger("Tridion.ContentDelivery.MyNamespace.MyClass");
Hope this helps.
P.S.: to answer your question: because you do not have an appender for it and the root logging is set to WARN. By default, the logback.xml contains appenders only for "com.tridion" but I guess that the output of this.getType().ToString() does not start with that string.