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    <p>AFAIK there's no "native" inheritance mechanism, but you may achieve the same result using an entity to reference and include an external xml fragment (see <a href="http://old.nabble.com/log4j-and-xlink-td21536915.html" rel="noreferrer" title="this nabble thread">this nabble thread</a>). If you just want to modify certain properties, a similar solution is described <a href="http://comments.gmane.org/gmane.comp.jakarta.log4j.user/19172" rel="noreferrer" title="here">here</a>. An Example using external entities:</p> <p>Main Config (log4j.xml):</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8" ?&gt; &lt;!DOCTYPE log4j:configuration SYSTEM "log4j.dtd" [ &lt;!ENTITY appender SYSTEM "appender.xml"&gt; &lt;!ENTITY root SYSTEM "root.xml"&gt; ]&gt; &lt;log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" &gt; &amp;appender; &amp;root; &lt;/log4j:configuration&gt; </code></pre> <p>appender.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;appender name="MyAppender" class="org.apache.log4j.DailyRollingFileAppender"&gt; &lt;param name="datePattern" value="'.'yyyy-MM-dd_HH-mm" /&gt; &lt;param name="file" value="logs/MyLogFile.log" /&gt; &lt;param name="Append" value="true" /&gt; &lt;layout class="org.apache.log4j.PatternLayout"&gt; &lt;param name="ConversionPattern" value="%d{ISO8601} %-5p [%t] %c: %m%n" /&gt; &lt;/layout&gt; &lt;/appender&gt; </code></pre> <p>root.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;root&gt; &lt;priority value="INFO" /&gt; &lt;appender-ref ref="MyAppender" /&gt; &lt;/root&gt; </code></pre> <p>It even works if both the root and the appender definition are placed into a <strong>single</strong> file, without the ?xml pi. So, the external content may even be an ill-formed xml fragment lacking a single root element. This allows for transferring the <strong>complete</strong> log4j config into an <strong>single external file</strong>:</p> <p>log4j.xml:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8" ?&gt; &lt;!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"[ &lt;!ENTITY config SYSTEM "log4j-config.txt"&gt; ]&gt; &lt;log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/" &gt; &amp;config; &lt;/log4j:configuration&gt; </code></pre> <p>log4j-config.txt:</p> <pre><code>&lt;appender name="MyAppender" class="org.apache.log4j.DailyRollingFileAppender"&gt; &lt;param name="datePattern" value="'.'yyyy-MM-dd_HH-mm" /&gt; &lt;param name="file" value="logs/MyLogFile.log" /&gt; &lt;param name="Append" value="true" /&gt; &lt;layout class="org.apache.log4j.PatternLayout"&gt; &lt;param name="ConversionPattern" value="%d{ISO8601} %-5p [%t] %c: %m%n" /&gt; &lt;/layout&gt; &lt;/appender&gt; &lt;root&gt; &lt;priority value="INFO" /&gt; &lt;appender-ref ref="MyAppender" /&gt; &lt;/root&gt; </code></pre> <p>If you need to adapt the log4j config in an individual and flexible way, you could try and merge the root.xml with the child.xml using XSLT or <a href="http://sourceforge.net/projects/el4j/" rel="noreferrer" title="XmlMerge &#40;part of el4j&#41;">XmlMerge (part of el4j)</a> to create a config on the fly, and feed the <a href="http://logging.apache.org/log4j/1.2/apidocs/index.html?org/apache/log4j/xml/DOMConfigurator.html" rel="noreferrer" title="org.apache.log4j.xml.DOMConfigurator">org.apache.log4j.xml.DOMConfigurator</a> with the resulting DOM. </p>
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    1. POCan log4j inherit xml from a base/root element?
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    1. COFrom what I can see external fragment is quite limited; only literals like path to appender can be used. Stuff like adding new logger seems impossible. Still this is best answer so far.
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    2. CO@bbaja42: i've added two examples that should work - i think it should be possible to put complete xml fragments in separate files and include them using entities.
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    3. COwell done. +1 and bounty. :D
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