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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">On 2023-02-17 03:20, Sébastien Philippon wrote:</p> <p style="margin: 10px 0 0">Hello,</p> <p style="margin: 10px 0 0">I believe the issue is caused by nesting a sift appender inside a conditional<br> <if> tag, as shown in the following example:</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<?xml version=<span class="code-quote" style="color: #009100">"1.0"</span> encoding=<span class="code-quote" style="color: #009100">"UTF-8"</span>?>
<configuration>
<variable name=<span class="code-quote" style="color: #009100">"test"</span> value=<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">true</span>"</span> />
<<span class="code-keyword" style="color: #000091">if</span> condition=<span class="code-quote" style="color: #009100">"isDefined("test")"</span>>
<appender name=<span class="code-quote" style="color: #009100">"SIFT"</span> class=<span class="code-quote" style="color: #009100">"ch.qos.logback.classic.sift.SiftingAppender"</span>>
<discriminator>
<key>logCategory</key>
<defaultValue>unknown</defaultValue>
</discriminator>
<sift>
<appender name=<span class="code-quote" style="color: #009100">"FILE-${logCategory}"</span> class=<span class="code-quote" style="color: #009100">"ch.qos.logback.core.FileAppender"</span>>
<file>logs/category-${logCategory}.log</file>
<encoder>
<pattern>%d [%X\{logCategory}] %msg%n</pattern>
</encoder>
</appender>
</sift>
</appender>
<logger name=<span class="code-quote" style="color: #009100">"com.github.sebphil.Application"</span> level=<span class="code-quote" style="color: #009100">"INFO"</span> additivity=<span class="code-quote" style="color: #009100">"<span class="code-keyword" style="color: #000091; color: #009100">false</span>"</span>>
<appender-ref ref=<span class="code-quote" style="color: #009100">"SIFT"</span> />
</logger>
</<span class="code-keyword" style="color: #000091">if</span>>
<appender name=<span class="code-quote" style="color: #009100">"CONSOLE"</span> class=<span class="code-quote" style="color: #009100">"ch.qos.logback.core.ConsoleAppender"</span>>
<encoder>
<pattern>%d [%X\{logCategory}] %msg%n</pattern>
</encoder>
</appender>
<root level=<span class="code-quote" style="color: #009100">"DEBUG"</span>>
<appender-ref ref=<span class="code-quote" style="color: #009100">"CONSOLE"</span> />
</root>
</configuration>
</pre>
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</div> <p style="margin: 10px 0 0">No inclusion nor custom Spring Boot tag are required.</p> <p style="margin: 10px 0 0">The startup log reports the following errors:<br> <tt>monospaced text</tt><br> 12:09:18,600 |-ERROR in ch.qos.logback.core.joran.action.AppenderAction -<br> Missing attribute <span class="error">[class]</span> in element <span class="error">[sift]</span> near line 12 12:09:18,600 |-ERROR in ch.qos.logback.core.joran.action.AppenderAction -<br> Missing attribute <span class="error">[name]</span> in element <span class="error">[sift]</span> near line 12 12:09:18,749 |-INFO in<br> ch.qos.logback.core.model.processor.conditional.IfModelHandler - Condition<br> <span class="error">[isDefined("test")]</span> evaluated to true on line 6 12:09:18,750 |-INFO in ch.qos.logback.core.model.processor.AppenderModelHandler</p>
<ul class="alternate" type="square">
<li>Processing appender named <span class="error">[SIFT]</span> 12:09:18,750 |-INFO in ch.qos.logback.core.model.processor.AppenderModelHandler</li>
<li>About to instantiate appender of type<br> <span class="error">[ch.qos.logback.classic.sift.SiftingAppender]</span> 12:09:18,754 |-INFO in ch.qos.logback.core.model.processor.ImplicitModelHandler</li>
<li>Assuming default type <span class="error">[ch.qos.logback.classic.sift.MDCBasedDiscriminator]</span> for<br> <span class="error">[discriminator]</span> property 12:09:18,755 |-WARN in ch.qos.logback.core.model.processor.AppenderModelHandler</li>
<li>Appender named <span class="error">[FILE-logCategory_IS_UNDEFINED]</span> not referenced. Skipping<br> further processing. 12:09:18,755 |-ERROR in ch.qos.logback.classic.sift.SiftingAppender<span class="error">[SIFT]</span> -<br> AppenderFactory has not been set. Aborting<br> <tt>monospaced text</tt></li>
</ul> <p style="margin: 10px 0 0">I made a sample project that demonstrates the issue </p> </td>
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