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-<!DOCTYPE html>
-<html><head>
- <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
- <link rel="stylesheet" type="text/css" href="../logi/reset.css" />
- <link rel="stylesheet" type="text/css" href="features.css" />
- <link rel="shortcut icon" href="../favicon.ico" type="image/x-icon" />
- <meta name="description" content="Spice up your java" />
- <title>@Log (and friends)</title>
-</head><body><div id="pepper">
- <div class="minimumHeight"></div>
- <div class="meat">
- <div class="header"><a href="../index.html">Project Lombok</a></div>
- <h1>@Log (and friends)</h1>
- <div class="byline">Captain's Log, stardate 24435.7: &quot;What was that line again?&quot;</div>
- <div class="overview">
- <h3>Overview</h3>
- <p>
- <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><p>
- There are several choices available:<br />
- <dl>
- <dt><code>@CommonsLog</code></dt>
- <dd>Creates <code><span class="keyword">private&nbsp;static&nbsp;final&nbsp;</span><a href="http://commons.apache.org/logging/apidocs/org/apache/commons/logging/Log.html">org.apache.commons.logging.Log</a>&nbsp;<span class="staticfield">log</span>&nbsp;=&nbsp;<a href="http://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>@JBossLog</code></dt>
- <dd>Creates <code><span class="keyword">private&nbsp;static&nbsp;final&nbsp;</span><a href="http://docs.jboss.org/jbosslogging/latest/org/jboss/logging/Logger.html">org.jboss.logging.Logger</a>&nbsp;<span class="staticfield">log</span>&nbsp;=&nbsp;<a href="http://docs.jboss.org/jbosslogging/latest/org/jboss/logging/Logger.html#getLogger(java.lang.Class)">org.jboss.logging.Logger.getLogger</a>(LogExample.<span class="keyword">class</span>);</code></dd>
- <dt><code>@Log</code></dt>
- <dd>Creates <code><span class="keyword">private&nbsp;static&nbsp;final&nbsp;</span><a href="http://download.oracle.com/javase/6/docs/api/java/util/logging/Logger.html">java.util.logging.Logger</a>&nbsp;<span class="staticfield">log</span>&nbsp;=&nbsp;<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&nbsp;static&nbsp;final&nbsp;</span><a href="http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Logger.html">org.apache.log4j.Logger</a>&nbsp;<span class="staticfield">log</span>&nbsp;=&nbsp;<a href="http://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&nbsp;static&nbsp;final&nbsp;</span><a href="http://logging.apache.org/log4j/2.0/log4j-api/apidocs/org/apache/logging/log4j/Logger.html">org.apache.logging.log4j.Logger</a>&nbsp;<span class="staticfield">log</span>&nbsp;=&nbsp;<a href="http://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&nbsp;static&nbsp;final&nbsp;</span><a href="http://www.slf4j.org/api/org/slf4j/Logger.html">org.slf4j.Logger</a>&nbsp;<span class="staticfield">log</span>&nbsp;=&nbsp;<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&nbsp;static&nbsp;final&nbsp;</span><a href="http://www.slf4j.org/api/org/slf4j/ext/XLogger.html">org.slf4j.ext.XLogger</a>&nbsp;<span class="staticfield">log</span>&nbsp;=&nbsp;<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>
- </div>
- <div class="snippets">
- <div class="pre">
- <h3>With Lombok</h3>
- <div class="snippet">@HTML_PRE@</div>
- </div>
- <div class="sep"></div>
- <div class="post">
- <h3>Vanilla Java</h3>
- <div class="snippet">@HTML_POST@</div>
- </div>
- </div>
- <div style="clear: left;"></div>
- <div class="overview confKeys">
- <h3>Supported configuration keys:</h3>
- <dl>
- <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.jbosslog.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)</dt>
- <dd>Lombok will flag any usage of <code>@lombok.extern.jbosslog.JBossLog</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>
- </dl>
- </div>
- <div class="overview">
- <h3>Small print</h3><div class="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>
- </div>
- </div>
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- <a href="index.html">Back to features</a> | <a href="GetterLazy.html">Previous feature (@Getter(lazy=true))</a> | <a href="configuration.html">Next feature (configuration)</a><br />
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