[logback-dev] [JIRA] (LOGBACK-1713) AppenderFactory not set in SiftingAppender

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Sébastien Philippon commented on LOGBACK-1713   Re: AppenderFactory not set in SiftingAppender Hello, I believe the issue is caused by nesting a sift appender inside a conditional <if> tag, as shown in the following example: <?xml version="1.0" encoding="UTF-8"?> <configuration> <variable name="test" value="true"/> <if condition='isDefined("test")'> <appender name="SIFT" class="ch.qos.logback.classic.sift.SiftingAppender"> <discriminator> <key>logCategory</key> <defaultValue>unknown</defaultValue> </discriminator> <sift> <appender name="FILE-${logCategory}" class="ch.qos.logback.core.FileAppender"> <file>logs/category-${logCategory}.log</file> <encoder> <pattern>%d [%X{logCategory}] %msg%n</pattern> </encoder> </appender> </sift> </appender> <logger name="com.github.sebphil.Application" level="INFO" additivity="false"> <appender-ref ref="SIFT"/> </logger> </if> <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>%d [%X{logCategory}] %msg%n</pattern> </encoder> </appender> <root level="DEBUG"> <appender-ref ref="CONSOLE"/> </root> </configuration> No inclusion nor custom Spring Boot tag are required. The startup log reports the following errors: 12:09:18,600 |-ERROR in ch.qos.logback.core.joran.action.AppenderAction - Missing attribute [class] in element [sift] near line 12 12:09:18,600 |-ERROR in ch.qos.logback.core.joran.action.AppenderAction - Missing attribute [name] in element [sift] near line 12 12:09:18,749 |-INFO in ch.qos.logback.core.model.processor.conditional.IfModelHandler - Condition [isDefined("test")] evaluated to true on line 6 12:09:18,750 |-INFO in ch.qos.logback.core.model.processor.AppenderModelHandler - Processing appender named [SIFT] 12:09:18,750 |-INFO in ch.qos.logback.core.model.processor.AppenderModelHandler - About to instantiate appender of type [ch.qos.logback.classic.sift.SiftingAppender] 12:09:18,754 |-INFO in ch.qos.logback.core.model.processor.ImplicitModelHandler - Assuming default type [ch.qos.logback.classic.sift.MDCBasedDiscriminator] for [discriminator] property 12:09:18,755 |-WARN in ch.qos.logback.core.model.processor.AppenderModelHandler - Appender named [FILE-logCategory_IS_UNDEFINED] not referenced. Skipping further processing. 12:09:18,755 |-ERROR in ch.qos.logback.classic.sift.SiftingAppender[SIFT] - AppenderFactory has not been set. Aborting I made a sample project that demonstrates the issue : https://github.com/sebphil/logback-conditional-sift-issue Add Comment   This message was sent by Atlassian Jira (v8.8.0#808000-sha1:e2c7e59)

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