java - Lockback exclude logger from root -

i have few packaged , want separate logging.

<property name="a" value="com.a"/> <property name="b" value="com.b"/> <property name="c" value="com.c"/>  <logger name="${a}" level="debug">     <appender-ref ref="file_a"/> </logger>  <logger name="${b}" level="debug">     <appender-ref ref="file_b"/> </logger>  <logger name="${c}" level="debug">     <appender-ref ref="file_b"/> <!-- yes b --> </logger>  <root level="debug">           <-- used other logs ->     <appender-ref ref="stdout"/>     <appender-ref ref="root_file"/> </root> 

so have file_a file_b , root_file; root_file contains info writes root logger , b , c loggers.

how can exclude file_a file_b info root_file ?

or in words how can exclude log data (com.c com.b com.a) root logger ?

set additivity flag com.a , com.b loggers false.

<logger name="${a}" level="debug" additivity="false">      <appender-ref ref="file_a"/> </logger> 

now events logged in logger won't propagated parent loggers (root logger in case).

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