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» Logging
<a
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<h1 class="post-title-main">Logging</h1>
</div>
<div class="post-content" data-github-edit-url="https://github.com/pmd/pmd/blob/main/docs/pages/pmd/devdocs/logging.md">
<details id="inline-toc-details">
<summary>Table of Contents</summary>
<div id="inline-toc"><!-- empty, move TOC here when screen size too small --></div>
</details>
<h2 id="logging-api-is-slf4j">Logging API is slf4j</h2>
<p>PMD uses <a href="https://www.slf4j.org/">slf4j</a> as the logging API internally. Logging can be done also in
(Java-based) rules.</p>
<p>In order to log, get a logger. Usually the logger is stored in a static final field called <code class="language-plaintext highlighter-rouge">LOG</code>:</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="kd">private</span> <span class="kd">static</span> <span class="kd">final</span> <span class="nc">Logger</span> <span class="no">LOG</span> <span class="o">=</span> <span class="nc">LoggerFactory</span><span class="o">.</span><span class="na">getLogger</span><span class="o">(</span><span class="nc">MyClass</span><span class="o">.</span><span class="na">class</span><span class="o">);</span>
</code></pre></div></div>
<h2 id="in-unit-tests">In Unit Tests</h2>
<p>If you need log output in unit tests, make sure to have a logging implementation on the test classpath.
E.g. you can add (if it is missing) the following dependency:</p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code> <span class="nt">&lt;dependency&gt;</span>
<span class="nt">&lt;groupId&gt;</span>org.slf4j<span class="nt">&lt;/groupId&gt;</span>
<span class="nt">&lt;artifactId&gt;</span>slf4j-simple<span class="nt">&lt;/artifactId&gt;</span>
<span class="nt">&lt;scope&gt;</span>test<span class="nt">&lt;/scope&gt;</span>
<span class="nt">&lt;/dependency&gt;</span>
</code></pre></div></div>
<p>To configure the logging, create the file <code class="language-plaintext highlighter-rouge">src/test/resources/simplelogger.properties</code>:</p>
<div class="language-plaintext highlighter-rouge"><div class="highlight"><pre class="highlight"><code>org.slf4j.simpleLogger.logFile=System.err
org.slf4j.simpleLogger.showDateTime=false
org.slf4j.simpleLogger.dateTimeFormat=yyyy-MM-dd'T'HH:mm:ss.SSSXXX
org.slf4j.simpleLogger.showThreadName=true
org.slf4j.simpleLogger.showThreadId=false
org.slf4j.simpleLogger.showLogName=true
org.slf4j.simpleLogger.showShortLogName=false
org.slf4j.simpleLogger.levelInBrackets=false
# Default log level for all loggers
# Must be one of "trace", "debug", "info", "warn", "error" or "off"
# Will be changed by "--debug" command line option
org.slf4j.simpleLogger.defaultLogLevel=info
# configure logging detail level for a single logger.
# Must be one of "trace", "debug", "info", "warn", "error" or "off"
#org.slf4j.simpleLogger.log.net.sourceforge.pmd.PMD=debug
#org.slf4j.simpleLogger.log.com.example.rules.MyRule=debug
</code></pre></div></div>
<p>If you want to verify log output in unit tests, you can use <code class="language-plaintext highlighter-rouge">org.junit.contrib.java.lang.system.SystemErrRule</code>.
Disabling the logging in this property file will the make the tests fail of course.</p>
<h2 id="binary-distribution">Binary distribution</h2>
<p>The binary distribution ships with also with <code class="language-plaintext highlighter-rouge">slf4j-simple</code> as the logger implementation.
The default configuration is provided in <code class="language-plaintext highlighter-rouge">pmd-dist/src/main/resources/config/simplelogger.properties</code>.</p>
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