Package Filter in Logback.xml - spring-boot

Question

Project Structure
I would like to output log for all queries under every mapper package.
I don't want like to define each mapper package like this since the project will consist of a lot of packages later.
don't want to do
How can i achieve like this?
<logger name="com.example.demo.*.mapper" level="DEBUG">
<appender-ref ref="SAVE-TO-FILE" />
</logger>

Answer 1

You could use a String constant for the logger name instead of letting Logback derive the logger name from the current class. For example, each class in the com.example.demo.*.mapper package would declare a logger like so:
// extract "MAPPER" to a shared constant to maybe provide a MapperLogger utility class
Logger logger = LoggerFactory.getLogger("MAPPER");
Then your logger configuration would be:
<logger name="MAPPER" level="DEBUG">
<appender-ref ref="SAVE-TO-FILE" />
</logger>
Or you could programmatically create loggers for every class in the com.example.demo.*.mapper package and associate each with your SAVE-TO-FILE appender.

Answer 2

I didn't find an answer to that question. That is why I've done some filtering by myself using ch.qos.logback.core.filter.EvaluatorFilter:
<configuration>
<property name="package" value="com.example.demo.*.mapper" />
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<filter class="ch.qos.logback.core.filter.EvaluatorFilter">
<evaluator>
<expression>return logger.matches("^" + "${package}".replaceAll("\\*", "\\.*").replaceAll("([^\\\\])\\.", "$1\\\\.") + "$");</expression>
</evaluator>
<OnMismatch>DENY</OnMismatch>
<OnMatch>NEUTRAL</OnMatch>
</filter>
<encoder>
<pattern>%-5level [%d{HH:mm:ss}] [%thread] %-30logger{10} %msg%n</pattern>
</encoder>
</appender>
</configuration>