回答編集履歴
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サンプルの追記
test
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@@ -7,3 +7,117 @@
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FooのFQCNの名前でlogback.xmlにloggerを定義すれば、LoggerFactory.getLogger(Foo.class)でappenderは取得できるようになると思いますが、その状態だとFooのloggerとrootのloggerで二重にログが出力されることになります。
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ただし、Fooのloggerのadditivityをfalseに設定すれば上位への伝搬を止めることができます。
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```xml
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<!-- Fooでappenderは取得できない -->
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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<!-- encoders are assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder
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by default -->
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<encoder>
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<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
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</pattern>
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</encoder>
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</appender>
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<root level="debug">
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<appender-ref ref="STDOUT" />
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</root>
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</configuration>
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```
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```xml
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<!-- Fooでappenderは取得できるがFooとrootで二重にログが出力される -->
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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<!-- encoders are assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder
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by default -->
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<encoder>
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<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
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</pattern>
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</encoder>
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</appender>
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<logger name="test.Foo" level="debug">
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<appender-ref ref="STDOUT" />
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</logger>
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<root level="debug">
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<appender-ref ref="STDOUT" />
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</root>
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</configuration>
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```
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```xml
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<!-- Fooでappenderが取得できてFooだけでログが出力される -->
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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<!-- encoders are assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder
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by default -->
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<encoder>
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<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
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</pattern>
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</encoder>
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</appender>
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<logger name="test.Foo" level="debug" additivity="false">
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<appender-ref ref="STDOUT" />
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</logger>
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<root level="debug">
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<appender-ref ref="STDOUT" />
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</root>
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</configuration>
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```
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