Hi, Think I set up the SLF4JBridgeHandler and LevelChangePropagator correctly, since I am now getting all log messages via SLF4J and changes in the level of my root logger are propagated to JUL but I cannot seem to tweak the levels of my JUL loggers: My configuration file <configuration> <contextListener class="ch.qos.logback.classic.jul.LevelChangePropagator"> <resetJUL>true</resetJUL> </contextListener> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <encoder> <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern> </encoder> </appender> <logger name="com.google.inject" level="debug" /> <root level="info"> <appender-ref ref="STDOUT" /> </root> </configuration> and debug output 23:28:35,723 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback.groovy] 23:28:35,723 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Could NOT find resource [logback-test.xml] 23:28:35,723 |-INFO in ch.qos.logback.classic.LoggerContext[default] - Found resource [logback.xml] at [file:/.../war/WEB-INF/classes/logback.xml] 23:28:35,763 |-INFO in ch.qos.logback.classic.joran.action.ConfigurationAction - debug attribute not set 23:28:35,764 |-INFO in ch.qos.logback.classic.joran.action.LoggerContextListenerAction - Adding LoggerContextListener of type [ch.qos.logback.classic.jul.LevelChangePropagator] to the object stack 23:28:35,778 |-INFO in ch.qos.logback.classic.jul.LevelChangePropagator@118cb3a - Propagating DEBUG level on Logger[ROOT] onto the JUL framework 23:28:35,778 |-INFO in ch.qos.logback.classic.joran.action.LoggerContextListenerAction - Starting LoggerContextListener 23:28:35,778 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - About to instantiate appender of type [ch.qos.logback.core.ConsoleAppender] 23:28:35,781 |-INFO in ch.qos.logback.core.joran.action.AppenderAction - Naming appender as [STDOUT] 23:28:35,787 |-INFO in ch.qos.logback.core.joran.action.NestedComplexPropertyIA - Assuming default type [ch.qos.logback.classic.encoder.PatternLayoutEncoder] for [encoder] property 23:28:35,826 |-INFO in ch.qos.logback.classic.joran.action.LoggerAction - Setting level of logger [com.google.inject] to DEBUG 23:28:35,826 |-INFO in ch.qos.logback.classic.jul.LevelChangePropagator@118cb3a - Propagating DEBUG level on Logger[com.google.inject] onto the JUL framework 23:28:35,826 |-INFO in ch.qos.logback.classic.joran.action.RootLoggerAction - Setting level of ROOT logger to INFO 23:28:35,826 |-INFO in ch.qos.logback.classic.jul.LevelChangePropagator@118cb3a - Propagating INFO level on Logger[ROOT] onto the JUL framework 23:28:35,826 |-INFO in ch.qos.logback.core.joran.action.AppenderRefAction - Attaching appender named [STDOUT] to Logger[ROOT] Although it states "Propagating DEBUG level on Logger[com.google.inject] onto the JUL framework", it does not seem to work. Moreover, if I manually do java.util.logging.Logger logger = java.util.logging.Logger.getLogger("com.google.inject"); logger.setLevel(java.util.logging.Level.FINEST); I do get debug messages! What am I doing wrong? Many thanks, Kristof