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<td style="vertical-align: top;; padding: 0px; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://jira.qos.ch/browse/LOGBACK-1612" style="color: #3b73af; text-decoration: none">Re: jul LevelChangePropagator is inconsistent with SLF4JBridgeHandler</a> </span> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">Another reason that <a href="https://logback.qos.ch/manual/configuration.html#LevelChangePropagator" class="external-link" target="_blank" rel="nofollow noopener" style="color: #3b73af; text-decoration: none">LevelChangePropagator</a> should be consistent with SLF4JBridgeHandler is that it is not supposed to change the logging behavior (except for resetJUL); it is supposed to be a performance optimization. When the logger level is checked in java.util.logging.Logger.log (configured by LevelChangePropagator), this is supposed to arrive at the same decision as the check for logger level in ch.qos.logback.classic.Logger.log.</p> <p style="margin: 10px 0 0 0">Compare the output with JUL logging enabled, with and without LevelChangePropagator (<tt>mvn exec:java -Dexec.mainClass=com.example.logbacksample.JulLoggerLevels -DcustomLogLevel=info -Djava.util.logging.config.file=<(echo .level = ALL)</tt>). Without LevelChangePropagator in logback.xml:</p>
<blockquote style="margin: 10px 0 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin: 10px 0 0 0; margin-top: 0">Root level is INFO<br> INFO c.e.logbacksample.JulLoggerLevels - Config (should be slf4j info)<br> INFO c.e.logbacksample.JulLoggerLevels - Info<br> WARN c.e.logbacksample.JulLoggerLevels - Warning (should be slf4j warn)<br> ERROR c.e.logbacksample.JulLoggerLevels - Severe (should be slf4j error)</p>
</blockquote> <p style="margin: 10px 0 0 0">Contrast to the output with LevelChangePropagator enabled in logback.xml:</p>
<blockquote style="margin: 10px 0 0 0; border-left: 1px solid #cccccc; color: #707070; margin-left: 19px; padding: 10px 20px">
<p style="margin: 10px 0 0 0; margin-top: 0">Root level is INFO<br> INFO c.e.logbacksample.JulLoggerLevels - Info<br> WARN c.e.logbacksample.JulLoggerLevels - Warning (should be slf4j warn)<br> ERROR c.e.logbacksample.JulLoggerLevels - Severe (should be slf4j error)</p>
</blockquote> <p style="margin: 10px 0 0 0">Since the log output doesn’t match when LevelChangePropagator is enabled, LevelChangePropagator has a bug.</p> </td>
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