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<#import "_features.html" as f>
<@f.scaffold title="@Log (and friends)" logline="Captain's Log, stardate 24435.7: "What was that line again?"">
<@f.history>
<p>
The various <code>@Log</code> variants were added in lombok v0.10.
<em>NEW in lombok 0.10: </em>You can annotate any class with a log annotation to let lombok generate a logger field.<br/>
The logger is named <code>log</code> and the field's type depends on which logger you have selected.
</p>
</@f.history>
<@f.overview>
<p>
You put the variant of <code>@Log</code> on your class (whichever one applies to the logging system you use); you then have a static final <code>log</code> field, initialized to the name of your class, which you can then use to write log statements.
</p><p>
There are six choices available:<br />
<dl>
<dt>
<code>@CommonsLog</code>
</dt><dd>
Creates <code><span class="keyword">private static final </span><a href="https://commons.apache.org/logging/apidocs/org/apache/commons/logging/Log.html">org.apache.commons.logging.Log</a> <span class="staticfield">log</span> = <a href="https://commons.apache.org/logging/apidocs/org/apache/commons/logging/LogFactory.html#getLog(java.lang.Class)">org.apache.commons.logging.LogFactory.getLog</a>(LogExample.<span class="keyword">class</span>);</code>
</dd><dt>
<code>@Log</code>
</dt><dd>
Creates <code><span class="keyword">private static final </span><a href="http://download.oracle.com/javase/6/docs/api/java/util/logging/Logger.html">java.util.logging.Logger</a> <span class="staticfield">log</span> = <a href="http://download.oracle.com/javase/6/docs/api/java/util/logging/Logger.html#getLogger(java.lang.String)">java.util.logging.Logger.getLogger</a>(LogExample.<span class="keyword">class</span>.getName());</code>
</dd><dt>
<code>@Log4j</code>
</dt><dd>
Creates <code><span class="keyword">private static final </span><a href="https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Logger.html">org.apache.log4j.Logger</a> <span class="staticfield">log</span> = <a href="https://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Logger.html#getLogger(java.lang.Class)">org.apache.log4j.Logger.getLogger</a>(LogExample.<span class="keyword">class</span>);</code>
</dd><dt>
<code>@Log4j2</code>
</dt><dd>
Creates <code><span class="keyword">private static final </span><a href="https://logging.apache.org/log4j/2.0/log4j-api/apidocs/org/apache/logging/log4j/Logger.html">org.apache.logging.log4j.Logger</a> <span class="staticfield">log</span> = <a href="https://logging.apache.org/log4j/2.0/log4j-api/apidocs/org/apache/logging/log4j/LogManager.html#getLogger(java.lang.Class)">org.apache.logging.log4j.LogManager.getLogger</a>(LogExample.<span class="keyword">class</span>);</code>
</dd><dt>
<code>@Slf4j</code>
</dt><dd>
Creates <code><span class="keyword">private static final </span><a href="http://www.slf4j.org/api/org/slf4j/Logger.html">org.slf4j.Logger</a> <span class="staticfield">log</span> = <a href="http://www.slf4j.org/apidocs/org/slf4j/LoggerFactory.html#getLogger(java.lang.Class)">org.slf4j.LoggerFactory.getLogger</a>(LogExample.<span class="keyword">class</span>);</code>
</dd><dt>
<code>@XSlf4j</code>
</dt><dd>
Creates <code><span class="keyword">private static final </span><a href="http://www.slf4j.org/api/org/slf4j/ext/XLogger.html">org.slf4j.ext.XLogger</a> <span class="staticfield">log</span> = <a href="http://www.slf4j.org/apidocs/org/slf4j/ext/XLoggerFactory.html#getXLogger(java.lang.Class)">org.slf4j.ext.XLoggerFactory.getXLogger</a>(LogExample.<span class="keyword">class</span>);</code>
</dd>
</dl>
</p><p>
By default, the topic (or name) of the logger will be the class name of the class annotated with the <code>@Log</code> annotation. This can be customised by specifying the <code>topic</code> parameter. For example: <code>@XSlf4j(topic="reporting")</code>.
</p>
</@f.overview>
<@f.snippets name="Log" />
<@f.confKeys>
<dt>
<code>lombok.log.fieldName</code> = <em>an identifier</em> (default: <code>log</code>).
</dt><dd>
The generated logger fieldname is by default '<code>log</code>', but you can change it to a different name with this setting.
</dd><dt>
<code>lombok.log.fieldIsStatic</code> = [<code>true</code> | <code>false</code>] (default: true)
</dt><dd>
Normally the generated logger is a <code>static</code> field. By setting this key to <code>false</code>, the generated field will be an instance field instead.
</dd><dt>
<code>lombok.log.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)
</dt><dd>
Lombok will flag any usage of any of the various log annotations as a warning or error if configured.
</dd><dt>
<code>lombok.log.apacheCommons.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)
</dt><dd>
Lombok will flag any usage of <code>@lombok.extern.apachecommons.CommonsLog</code> as a warning or error if configured.
</dd><dt>
<code>lombok.log.javaUtilLogging.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)
</dt><dd>
Lombok will flag any usage of <code>@lombok.extern.java.Log</code> as a warning or error if configured.
</dd><dt>
<code>lombok.log.log4j.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)
</dt><dd>
Lombok will flag any usage of <code>@lombok.extern.log4j.Log4j</code> as a warning or error if configured.
</dd><dt>
<code>lombok.log.log4j2.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)
</dt><dd>
Lombok will flag any usage of <code>@lombok.extern.log4j.Log4j2</code> as a warning or error if configured.
</dd><dt>
<code>lombok.log.slf4j.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)
</dt><dd>
Lombok will flag any usage of <code>@lombok.extern.slf4j.Slf4j</code> as a warning or error if configured.
</dd><dt>
<code>lombok.log.xslf4j.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)
</dt><dd>
Lombok will flag any usage of <code>@lombok.extern.slf4j.XSlf4j</code> as a warning or error if configured.
</dd>
</@f.confKeys>
<@f.smallPrint>
<p>
If a field called <code>log</code> already exists, a warning will be emitted and no code will be generated.
</p><p>
A future feature of lombok's diverse log annotations is to find calls to the logger field and, if the chosen logging framework supports it and the log level can be compile-time determined from the log call, guard it with an <code>if</code> statement. This way if the log statement ends up being ignored, the potentially expensive calculation of the log string is avoided entirely. This does mean that you should <em>NOT</em> put any side-effects in the expression that you log.
</p>
</@f.smallPrint>
</@f.scaffold>
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