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Travis CI (pmd-bot) eff825bed7 Update documentation 
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<h1 class="post-title-main">PMD 7.0.0 development</h1>
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<a target="_blank" href="https://github.com/pmd/pmd/blob/master/docs/pages/next_major_development.md" class="btn btn-default githubEditButton" role="button"><i class="fa fa-github fa-lg"></i> Edit me</a>
<p>We’re excited to bring you the next major version of PMD! Here are the major features and changes we’re working on.
To give us feedback or to suggest a new feature, drop us a line on <a href="https://gitter.im/pmd/pmd">Gitter</a>!</p>
<h2 id="new-features">New Features</h2>
<p>TODO</p>
<h2 id="java-grammar-changes">Java grammar changes</h2>
<div class="alert alert-info" role="alert"><i class="fa fa-info-circle"></i> <b>Note:</b> Current plans are listed <a href="https://github.com/pmd/pmd/labels/in%3Aast">here</a> and in particular <a href="https://github.com/pmd/pmd/issues/1019">here</a></div>
<h2 id="new-api-support-guidelines">New API support guidelines</h2>
<h3 id="whats-new">What’s new</h3>
<p>Until now, all released public members and types were implicitly considered part
of PMD’s public API, including inheritance-specific members (protected members, abstract methods).
We have maintained those APIs with the goal to preserve full binary compatibility between minor releases,
only breaking those APIs infrequently, for major releases.</p>
<p>In order to allow PMD to move forward at a faster pace, this implicit contract will
be invalidated with PMD 7.0.0. We now introduce more fine-grained distinctions between
the type of compatibility support we guarantee for our libraries, and ways to make
them explicit to clients of PMD.</p>
<h4 id="internal-packages-and-internalapi-annotation"><code class="highlighter-rouge">.internal</code> packages and <code class="highlighter-rouge">@InternalApi</code> annotation</h4>
<p><em>Internal API</em> is meant for use <em>only</em> by the main PMD codebase. Internal types and methods
may be modified in any way, or even removed, at any time.</p>
<p>Any API in a package that contains an <code class="highlighter-rouge">.internal</code> segment is considered internal.
The <code class="highlighter-rouge">@InternalApi</code> annotation will be used for APIs that have to live outside of
these packages, e.g. methods of a public type that shouldn’t be used outside of PMD (again,
these can be removed anytime).</p>
<h4 id="reservedsubclassing"><code class="highlighter-rouge">@ReservedSubclassing</code></h4>
<p>Types marked with the <code class="highlighter-rouge">@ReservedSubclassing</code> annotation are only meant to be subclassed
by classes within PMD. As such, we may add new abstract methods, or remove protected methods,
at any time. All published public members remain supported. The annotation is <em>not</em> inherited, which
means a reserved interface doesn’t prevent its implementors to be subclassed.</p>
<h4 id="experimental"><code class="highlighter-rouge">@Experimental</code></h4>
<p>APIs marked with the <code class="highlighter-rouge">@Experimental</code> annotation at the class or method level are subject to change.
They can be modified in any way, or even removed, at any time. You should not use or rely
on them in any production code. They are purely to allow broad testing and feedback.</p>
<h4 id="deprecated"><code class="highlighter-rouge">@Deprecated</code></h4>
<p>APIs marked with the <code class="highlighter-rouge">@Deprecated</code> annotation at the class or method level will remain supported
until the next major release but it is recommended to stop using them.</p>
<h3 id="the-transition">The transition</h3>
<p><em>All currently supported APIs will remain so until 7.0.0</em>. All APIs that are to be moved to
<code class="highlighter-rouge">.internal</code> packages or hidden will be tagged <code class="highlighter-rouge">@InternalApi</code> before that major release, and
the breaking API changes will be performed in 7.0.0.</p>
<h2 id="planned-api-removals">Planned API removals</h2>
<h3 id="list-of-currently-deprecated-apis">List of currently deprecated APIs</h3>
<div class="alert alert-danger" role="alert"><i class="fa fa-exclamation-circle"></i> <b>Warning:</b> This list is not exhaustive. The ultimate reference is whether
an API is tagged as <code class="highlighter-rouge">@Deprecated</code> or not in the latest minor release. During the development of 7.0.0,
we may decide to remove some APIs that were not tagged as deprecated, though we’ll try to avoid it.</div>
<h4 id="6110">6.11.0</h4>
<ul>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/rule/stat/StatisticalRule.html#"><code class="highlighter-rouge">StatisticalRule</code></a> and the related helper classes and base rule classes
are deprecated for removal in 7.0.0. This includes all of <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/stat/package-summary.html#"><code class="highlighter-rouge">net.sourceforge.pmd.stat</code></a> and <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/rule/stat/package-summary.html#"><code class="highlighter-rouge">net.sourceforge.pmd.lang.rule.stat</code></a>,
and also <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/rule/AbstractStatisticalJavaRule.html#"><code class="highlighter-rouge">AbstractStatisticalJavaRule</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-apex/6.12.0/net/sourceforge/pmd/lang/apex/rule/AbstractStatisticalApexRule.html#"><code class="highlighter-rouge">AbstractStatisticalApexRule</code></a> and the like.
The methods <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/Report.html#addMetric(net.sourceforge.pmd.stat.Metric)"><code class="highlighter-rouge">Report#addMetric</code></a> and <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/ThreadSafeReportListener.html#metricAdded(net.sourceforge.pmd.stat.Metric)"><code class="highlighter-rouge">metricAdded</code></a>
will also be removed.</li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertySource.html#setProperty(net.sourceforge.pmd.properties.MultiValuePropertyDescriptor,Object[])"><code class="highlighter-rouge">setProperty</code></a> is deprecated,
because <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/MultiValuePropertyDescriptor.html#"><code class="highlighter-rouge">MultiValuePropertyDescriptor</code></a> is deprecated as well</li>
</ul>
<h4 id="6100">6.10.0</h4>
<h5 id="properties-framework">Properties framework</h5>
<p>The properties framework is about to get a lifting, and for that reason, we need to deprecate a lot of APIs
to remove them in 7.0.0. The proposed changes to the API are described <a href="https://github.com/pmd/pmd/wiki/Property-framework-7-0-0">on the wiki</a></p>
<h6 id="changes-to-how-you-define-properties">Changes to how you define properties</h6>
<ul>
<li>
<p>Construction of property descriptors has been possible through builders since 6.0.0. The 7.0.0 API will only allow
construction through builders. The builder hierarchy, currently found in the package <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/builders/package-summary.html#"><code class="highlighter-rouge">net.sourceforge.pmd.properties.builders</code></a>,
is being replaced by the simpler <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyBuilder.html#"><code class="highlighter-rouge">PropertyBuilder</code></a>. Their APIs enjoy a high degree of source compatibility.</p>
</li>
<li>
<p>Concrete property classes like <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/IntegerProperty.html#"><code class="highlighter-rouge">IntegerProperty</code></a> and <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/StringMultiProperty.html#"><code class="highlighter-rouge">StringMultiProperty</code></a> will gradually
all be deprecated until 7.0.0. Their usages should be replaced by direct usage of the <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#"><code class="highlighter-rouge">PropertyDescriptor</code></a>
interface, e.g. <code class="highlighter-rouge">PropertyDescriptor&lt;Integer&gt;</code> or <code class="highlighter-rouge">PropertyDescriptor&lt;List&lt;String&gt;&gt;</code>.</p>
</li>
<li>
<p>Instead of spreading properties across countless classes, the utility class <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#"><code class="highlighter-rouge">PropertyFactory</code></a> will become
from 7.0.0 on the only provider for property descriptor builders. Each current property type will be replaced
by a corresponding method on <code class="highlighter-rouge">PropertyFactory</code>:</p>
<ul>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/IntegerProperty.html#"><code class="highlighter-rouge">IntegerProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#intProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#intProperty</code></a>
<ul>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/IntegerMultiProperty.html#"><code class="highlighter-rouge">IntegerMultiProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#intListProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#intListProperty</code></a></li>
</ul>
</li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/FloatProperty.html#"><code class="highlighter-rouge">FloatProperty</code></a> and <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/DoubleProperty.html#"><code class="highlighter-rouge">DoubleProperty</code></a> are both replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#doubleProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#doubleProperty</code></a>.
Having a separate property for floats wasn’t that useful.
<ul>
<li>Similarly, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/FloatMultiProperty.html#"><code class="highlighter-rouge">FloatMultiProperty</code></a> and <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/DoubleMultiProperty.html#"><code class="highlighter-rouge">DoubleMultiProperty</code></a> are replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#doubleListProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#doubleListProperty</code></a>.</li>
</ul>
</li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/StringProperty.html#"><code class="highlighter-rouge">StringProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#stringProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#stringProperty</code></a>
<ul>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/StringMultiProperty.html#"><code class="highlighter-rouge">StringMultiProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#stringListProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#stringListProperty</code></a></li>
</ul>
</li>
<li>
<p><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/RegexProperty.html#"><code class="highlighter-rouge">RegexProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#regexProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#regexProperty</code></a></p>
</li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/EnumeratedProperty.html#"><code class="highlighter-rouge">EnumeratedProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#enumProperty(java.lang.String,java.util.Map)"><code class="highlighter-rouge">PropertyFactory#enumProperty</code></a>
<ul>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/EnumeratedProperty.html#"><code class="highlighter-rouge">EnumeratedProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#enumListProperty(java.lang.String,java.util.Map)"><code class="highlighter-rouge">PropertyFactory#enumListProperty</code></a></li>
</ul>
</li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/BooleanProperty.html#"><code class="highlighter-rouge">BooleanProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#booleanProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#booleanProperty</code></a>
<ul>
<li>Its multi-valued counterpart, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/BooleanMultiProperty.html#"><code class="highlighter-rouge">BooleanMultiProperty</code></a>, is not replaced, because it doesn’t have a use case.</li>
</ul>
</li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/CharacterProperty.html#"><code class="highlighter-rouge">CharacterProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#charProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#charProperty</code></a>
<ul>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/CharacterMultiProperty.html#"><code class="highlighter-rouge">CharacterMultiProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#charListProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#charListProperty</code></a></li>
</ul>
</li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/LongProperty.html#"><code class="highlighter-rouge">LongProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#longIntProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#longIntProperty</code></a>
<ul>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/LongMultiProperty.html#"><code class="highlighter-rouge">LongMultiProperty</code></a> is replaced by <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyFactory.html#longIntListProperty(java.lang.String)"><code class="highlighter-rouge">PropertyFactory#longIntListProperty</code></a></li>
</ul>
</li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/MethodProperty.html#"><code class="highlighter-rouge">MethodProperty</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/FileProperty.html#"><code class="highlighter-rouge">FileProperty</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/TypeProperty.html#"><code class="highlighter-rouge">TypeProperty</code></a> and their multi-valued counterparts
are discontinued for lack of a use-case, and have no planned replacement in 7.0.0 for now.
<!-- TODO complete that as we proceed. --></li>
</ul>
</li>
</ul>
<p>Here’s an example:</p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">// Before 7.0.0, these are equivalent:</span>
<span class="n">IntegerProperty</span> <span class="n">myProperty</span> <span class="o">=</span> <span class="k">new</span> <span class="n">IntegerProperty</span><span class="o">(</span><span class="s">"score"</span><span class="o">,</span> <span class="s">"Top score value"</span><span class="o">,</span> <span class="mi">1</span><span class="o">,</span> <span class="mi">100</span><span class="o">,</span> <span class="mi">40</span><span class="o">,</span> <span class="mf">3.0f</span><span class="o">);</span>
<span class="n">IntegerProperty</span> <span class="n">myProperty</span> <span class="o">=</span> <span class="n">IntegerProperty</span><span class="o">.</span><span class="na">named</span><span class="o">(</span><span class="s">"score"</span><span class="o">).</span><span class="na">desc</span><span class="o">(</span><span class="s">"Top score value"</span><span class="o">).</span><span class="na">range</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="mi">100</span><span class="o">).</span><span class="na">defaultValue</span><span class="o">(</span><span class="mi">40</span><span class="o">).</span><span class="na">uiOrder</span><span class="o">(</span><span class="mf">3.0f</span><span class="o">);</span>
<span class="c1">// They both map to the following in 7.0.0</span>
<span class="n">PropertyDescriptor</span><span class="o">&lt;</span><span class="n">Integer</span><span class="o">&gt;</span> <span class="n">myProperty</span> <span class="o">=</span> <span class="n">PropertyFactory</span><span class="o">.</span><span class="na">intProperty</span><span class="o">(</span><span class="s">"score"</span><span class="o">).</span><span class="na">desc</span><span class="o">(</span><span class="s">"Top score value"</span><span class="o">).</span><span class="na">require</span><span class="o">(</span><span class="n">inRange</span><span class="o">(</span><span class="mi">1</span><span class="o">,</span> <span class="mi">100</span><span class="o">)).</span><span class="na">defaultValue</span><span class="o">(</span><span class="mi">40</span><span class="o">);</span>
</code></pre></div></div>
<p>You’re highly encouraged to migrate to using this new API as soon as possible, to ease your migration to 7.0.0.</p>
<h6 id="architectural-simplifications">Architectural simplifications</h6>
<ul>
<li>
<p><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/EnumeratedPropertyDescriptor.html#"><code class="highlighter-rouge">EnumeratedPropertyDescriptor</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/NumericPropertyDescriptor.html#"><code class="highlighter-rouge">NumericPropertyDescriptor</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PackagedPropertyDescriptor.html#"><code class="highlighter-rouge">PackagedPropertyDescriptor</code></a>,
and the related builders (in <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/builders/package-summary.html#"><code class="highlighter-rouge">net.sourceforge.pmd.properties.builders</code></a>) will be removed.
These specialized interfaces allowed additional constraints to be enforced on the
value of a property, but made the property class hierarchy very large and impractical
to maintain. Their functionality will be mapped uniformly to <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/constraints/PropertyConstraint.html#"><code class="highlighter-rouge">PropertyConstraint</code></a>s,
which will allow virtually any constraint to be defined, and improve documentation and error reporting. The
related methods <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyTypeId.html#isPropertyNumeric()"><code class="highlighter-rouge">PropertyTypeId#isPropertyNumeric</code></a> and
<a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyTypeId.html#isPropertyPackaged()"><code class="highlighter-rouge">PropertyTypeId#isPropertyPackaged</code></a> are also deprecated.</p>
</li>
<li>
<p><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/MultiValuePropertyDescriptor.html#"><code class="highlighter-rouge">MultiValuePropertyDescriptor</code></a> and <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/SingleValuePropertyDescriptor.html#"><code class="highlighter-rouge">SingleValuePropertyDescriptor</code></a>
are deprecated. 7.0.0 will introduce a new XML syntax which will remove the need for such a divide
between single- and multi-valued properties. The method <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#isMultiValue()"><code class="highlighter-rouge">PropertyDescriptor#isMultiValue</code></a> will be removed
accordingly.</p>
</li>
</ul>
<h6 id="changes-to-the-propertydescriptor-interface">Changes to the PropertyDescriptor interface</h6>
<ul>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#preferredRowCount()"><code class="highlighter-rouge">preferredRowCount</code></a> is deprecated with no intended replacement. It was never implemented, and does not belong
in this interface. The methods <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#uiOrder()"><code class="highlighter-rouge">uiOrder</code></a> and <code class="highlighter-rouge">compareTo(PropertyDescriptor)</code> are deprecated for the
same reason. These methods mix presentation logic with business logic and are not necessary for PropertyDescriptors to work.
<code class="highlighter-rouge">PropertyDescriptor</code> will not extend <code class="highlighter-rouge">Comparable&lt;PropertyDescriptor&gt;</code> anymore come 7.0.0.</li>
<li>The method <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#propertyErrorFor(net.sourceforge.pmd.Rule)"><code class="highlighter-rouge">propertyErrorFor</code></a> is deprecated and will be removed with no intended
replacement. It’s really just a shortcut for <code class="highlighter-rouge">prop.errorFor(rule.getProperty(prop))</code>.</li>
<li><code class="highlighter-rouge">T </code><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#valueFrom(java.lang.String)"><code class="highlighter-rouge">valueFrom(String)</code></a> and <code class="highlighter-rouge">String </code><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#asDelimitedString(java.lang.Object)"><code class="highlighter-rouge">asDelimitedString</code></a><code class="highlighter-rouge">(T)</code> are deprecated and will be removed. These were
used to serialize and deserialize properties to/from a string, but 7.0.0 will introduce a more flexible
XML syntax which will make them obsolete.</li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#isMultiValue()"><code class="highlighter-rouge">isMultiValue</code></a> and <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#type()"><code class="highlighter-rouge">type</code></a> are deprecated and won’t be replaced. The new XML syntax will remove the need
for a divide between multi- and single-value properties, and will allow arbitrary types to be represented.
Since arbitrary types may be represented, <code class="highlighter-rouge">type</code> will become obsolete as it can’t represent generic types,
which will nevertheless be representable with the XML syntax. It was only used for documentation, but a
new way to document these properties exhaustively will be added with 7.0.0.</li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#errorFor(java.lang.Object)"><code class="highlighter-rouge">errorFor</code></a> is deprecated as its return type will be changed to <code class="highlighter-rouge">Optional&lt;String&gt;</code> with the shift to Java 8.</li>
</ul>
<h5 id="deprecated-apis">Deprecated APIs</h5>
<h6 id="for-internalization">For internalization</h6>
<ul>
<li>
<p>The implementation of the adapters for the XPath engines Saxon and Jaxen (package <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/ast/xpath/package-summary.html#"><code class="highlighter-rouge">net.sourceforge.pmd.lang.ast.xpath</code></a>)
are now deprecated. They’ll be moved to an internal package come 7.0.0. Only <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/ast/xpath/Attribute.html#"><code class="highlighter-rouge">Attribute</code></a> remains public API.</p>
</li>
<li>
<p>The classes <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptorField.html#"><code class="highlighter-rouge">PropertyDescriptorField</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/builders/PropertyDescriptorBuilderConversionWrapper.html#"><code class="highlighter-rouge">PropertyDescriptorBuilderConversionWrapper</code></a>, and the methods
<a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#attributeValuesById"><code class="highlighter-rouge">PropertyDescriptor#attributeValuesById</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyDescriptor.html#isDefinedExternally()"><code class="highlighter-rouge">PropertyDescriptor#isDefinedExternally</code></a> and <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/PropertyTypeId.html#getFactory()"><code class="highlighter-rouge">PropertyTypeId#getFactory</code></a>.
These were used to read and write properties to and from XML, but were not intended as public API.</p>
</li>
<li>
<p>The class <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/ValueParserConstants.html#"><code class="highlighter-rouge">ValueParserConstants</code></a> and the interface <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/ValueParser.html#"><code class="highlighter-rouge">ValueParser</code></a>.</p>
</li>
<li>
<p>All classes from <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/metrics/impl/visitors/package-summary.html#"><code class="highlighter-rouge">net.sourceforge.pmd.lang.java.metrics.impl.visitors</code></a> are now considered internal API. They’re deprecated
and will be moved into an internal package with 7.0.0. To implement your own metrics visitors,
<a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/JavaParserVisitorAdapter.html#"><code class="highlighter-rouge">JavaParserVisitorAdapter</code></a> should be directly subclassed.</p>
</li>
<li>
<p><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/LanguageVersionHandler.html#getDataFlowHandler()"><code class="highlighter-rouge">LanguageVersionHandler#getDataFlowHandler()</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/LanguageVersionHandler.html#getDFAGraphRule()"><code class="highlighter-rouge">LanguageVersionHandler#getDFAGraphRule()</code></a></p>
</li>
<li>
<p><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/VisitorStarter.html#"><code class="highlighter-rouge">VisitorStarter</code></a></p>
</li>
</ul>
<h6 id="for-removal">For removal</h6>
<ul>
<li>
<p>All classes from <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/properties/modules/package-summary.html#"><code class="highlighter-rouge">net.sourceforge.pmd.properties.modules</code></a> will be removed.</p>
</li>
<li>
<p>The interface <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/Dimensionable.html#"><code class="highlighter-rouge">Dimensionable</code></a> has been deprecated.
It gets in the way of a grammar change for 7.0.0 and won’t be needed anymore (see <a href="https://github.com/pmd/pmd/issues/997">#997</a>).</p>
</li>
<li>
<p>Several methods from <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/ASTLocalVariableDeclaration.html#"><code class="highlighter-rouge">ASTLocalVariableDeclaration</code></a> and <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/ASTFieldDeclaration.html#"><code class="highlighter-rouge">ASTFieldDeclaration</code></a> have
also been deprecated:</p>
<ul>
<li>
<p><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/ASTFieldDeclaration.html#"><code class="highlighter-rouge">ASTFieldDeclaration</code></a> won’t be a <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/TypeNode.html#"><code class="highlighter-rouge">TypeNode</code></a> come 7.0.0, so
<a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/ASTFieldDeclaration.html#getType()"><code class="highlighter-rouge">getType</code></a> and
<a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/ASTFieldDeclaration.html#getTypeDefinition()"><code class="highlighter-rouge">getTypeDefinition</code></a> are deprecated.</p>
</li>
<li>
<p>The method <code class="highlighter-rouge">getVariableName</code> on those two nodes will be removed, too.</p>
</li>
</ul>
<p>All these are deprecated because those nodes may declare several variables at once, possibly
with different types (and obviously with different names). They both implement <code class="highlighter-rouge">Iterator&lt;</code><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/ASTVariableDeclaratorId.html#"><code class="highlighter-rouge">ASTVariableDeclaratorId</code></a><code class="highlighter-rouge">&gt;</code>
though, so you should iterate on each declared variable. See <a href="https://github.com/pmd/pmd/issues/910">#910</a>.</p>
</li>
<li>
<p>Visitor decorators are now deprecated and will be removed in PMD 7.0.0. They were originally a way to write
composable visitors, used in the metrics framework, but they didn’t prove cost-effective.</p>
<ul>
<li>In <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/package-summary.html#"><code class="highlighter-rouge">net.sourceforge.pmd.lang.java.ast</code></a>: <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/JavaParserDecoratedVisitor.html#"><code class="highlighter-rouge">JavaParserDecoratedVisitor</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/JavaParserControllessVisitor.html#"><code class="highlighter-rouge">JavaParserControllessVisitor</code></a>,
<a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/JavaParserControllessVisitorAdapter.html#"><code class="highlighter-rouge">JavaParserControllessVisitorAdapter</code></a>, and <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-java/6.12.0/net/sourceforge/pmd/lang/java/ast/JavaParserVisitorDecorator.html#"><code class="highlighter-rouge">JavaParserVisitorDecorator</code></a> are deprecated with no intended replacement.</li>
</ul>
</li>
<li>
<p>The LanguageModules of several languages, that only support CPD execution, have been deprecated. These languages
are not fully supported by PMD, so having a language module does not make sense. The functionality of CPD is
not affected by this change. The following classes have been deprecated and will be removed with PMD 7.0.0:</p>
<ul>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-cpp/6.12.0/net/sourceforge/pmd/lang/cpp/CppHandler.html#"><code class="highlighter-rouge">CppHandler</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-cpp/6.12.0/net/sourceforge/pmd/lang/cpp/CppLanguageModule.html#"><code class="highlighter-rouge">CppLanguageModule</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-cpp/6.12.0/net/sourceforge/pmd/lang/cpp/CppParser.html#"><code class="highlighter-rouge">CppParser</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-cs/6.12.0/net/sourceforge/pmd/lang/cs/CsLanguageModule.html#"><code class="highlighter-rouge">CsLanguageModule</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-fortran/6.12.0/net/sourceforge/pmd/lang/fortran/FortranLanguageModule.html#"><code class="highlighter-rouge">FortranLanguageModule</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-groovy/6.12.0/net/sourceforge/pmd/lang/groovy/GroovyLanguageModule.html#"><code class="highlighter-rouge">GroovyLanguageModule</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-matlab/6.12.0/net/sourceforge/pmd/lang/matlab/MatlabHandler.html#"><code class="highlighter-rouge">MatlabHandler</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-matlab/6.12.0/net/sourceforge/pmd/lang/matlab/MatlabLanguageModule.html#"><code class="highlighter-rouge">MatlabLanguageModule</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-matlab/6.12.0/net/sourceforge/pmd/lang/matlab/MatlabParser.html#"><code class="highlighter-rouge">MatlabParser</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-objectivec/6.12.0/net/sourceforge/pmd/lang/objectivec/ObjectiveCHandler.html#"><code class="highlighter-rouge">ObjectiveCHandler</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-objectivec/6.12.0/net/sourceforge/pmd/lang/objectivec/ObjectiveCLanguageModule.html#"><code class="highlighter-rouge">ObjectiveCLanguageModule</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-objectivec/6.12.0/net/sourceforge/pmd/lang/objectivec/ObjectiveCParser.html#"><code class="highlighter-rouge">ObjectiveCParser</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-php/6.12.0/net/sourceforge/pmd/lang/php/PhpLanguageModule.html#"><code class="highlighter-rouge">PhpLanguageModule</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-python/6.12.0/net/sourceforge/pmd/lang/python/PythonHandler.html#"><code class="highlighter-rouge">PythonHandler</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-python/6.12.0/net/sourceforge/pmd/lang/python/PythonLanguageModule.html#"><code class="highlighter-rouge">PythonLanguageModule</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-python/6.12.0/net/sourceforge/pmd/lang/python/PythonParser.html#"><code class="highlighter-rouge">PythonParser</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-ruby/6.12.0/net/sourceforge/pmd/lang/ruby/RubyLanguageModule.html#"><code class="highlighter-rouge">RubyLanguageModule</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-scala/6.12.0/net/sourceforge/pmd/lang/scala/ScalaLanguageModule.html#"><code class="highlighter-rouge">ScalaLanguageModule</code></a></li>
<li><a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-swift/6.12.0/net/sourceforge/pmd/lang/swift/SwiftLanguageModule.html#"><code class="highlighter-rouge">SwiftLanguageModule</code></a></li>
</ul>
</li>
<li>
<p>Optional AST processing stages like symbol table, type resolution or data-flow analysis will be reified
in 7.0.0 to factorise common logic and make them extensible. Further explanations about this change can be
found on <a href="https://github.com/pmd/pmd/pull/1426">#1426</a>. Consequently, the following APIs are deprecated for
removal:</p>
<ul>
<li>In <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/Rule.html#"><code class="highlighter-rouge">Rule</code></a>: <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/Rule.html#isDfa()"><code class="highlighter-rouge">isDfa()</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/Rule.html#isTypeResolution()"><code class="highlighter-rouge">isTypeResolution()</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/Rule.html#isMultifile()"><code class="highlighter-rouge">isMultifile()</code></a> and their
respective setters.</li>
<li>In <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/RuleSet.html#"><code class="highlighter-rouge">RuleSet</code></a>: <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/RuleSet.html#usesDFA(net.sourceforge.pmd.lang.Language)"><code class="highlighter-rouge">usesDFA(Language)</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/RuleSet.html#usesTypeResolution(net.sourceforge.pmd.lang.Language)"><code class="highlighter-rouge">usesTypeResolution(Language)</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/RuleSet.html#usesMultifile(net.sourceforge.pmd.lang.Language)"><code class="highlighter-rouge">usesMultifile(Language)</code></a></li>
<li>In <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/RuleSets.html#"><code class="highlighter-rouge">RuleSets</code></a>: <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/RuleSets.html#usesDFA(net.sourceforge.pmd.lang.Language)"><code class="highlighter-rouge">usesDFA(Language)</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/RuleSets.html#usesTypeResolution(net.sourceforge.pmd.lang.Language)"><code class="highlighter-rouge">usesTypeResolution(Language)</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/RuleSets.html#usesMultifile(net.sourceforge.pmd.lang.Language)"><code class="highlighter-rouge">usesMultifile(Language)</code></a></li>
<li>In <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/LanguageVersionHandler.html#"><code class="highlighter-rouge">LanguageVersionHandler</code></a>: <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/LanguageVersionHandler.html#getDataFlowFacade()"><code class="highlighter-rouge">getDataFlowFacade()</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/LanguageVersionHandler.html#getSymbolFacade()"><code class="highlighter-rouge">getSymbolFacade()</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/LanguageVersionHandler.html#getSymbolFacade(java.lang.ClassLoader)"><code class="highlighter-rouge">getSymbolFacade(ClassLoader)</code></a>,
<a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/LanguageVersionHandler.html#getTypeResolutionFacade(java.lang.ClassLoader)"><code class="highlighter-rouge">getTypeResolutionFacade(ClassLoader)</code></a>, <a href="https://javadoc.io/page/net.sourceforge.pmd/pmd-core/6.12.0/net/sourceforge/pmd/lang/LanguageVersionHandler.html#getQualifiedNameResolutionFacade(java.lang.ClassLoader)"><code class="highlighter-rouge">getQualifiedNameResolutionFacade(ClassLoader)</code></a></li>
</ul>
</li>
</ul>
<h4 id="690">6.9.0</h4>
<p>No changes.</p>
<h4 id="680">6.8.0</h4>
<ul>
<li>
<p>A couple of methods and fields in <code class="highlighter-rouge">net.sourceforge.pmd.properties.AbstractPropertySource</code> have been
deprecated, as they are replaced by already existing functionality or expose internal implementation
details: <code class="highlighter-rouge">propertyDescriptors</code>, <code class="highlighter-rouge">propertyValuesByDescriptor</code>,
<code class="highlighter-rouge">copyPropertyDescriptors()</code>, <code class="highlighter-rouge">copyPropertyValues()</code>, <code class="highlighter-rouge">ignoredProperties()</code>, <code class="highlighter-rouge">usesDefaultValues()</code>,
<code class="highlighter-rouge">useDefaultValueFor()</code>.</p>
</li>
<li>
<p>Some methods in <code class="highlighter-rouge">net.sourceforge.pmd.properties.PropertySource</code> have been deprecated as well:
<code class="highlighter-rouge">usesDefaultValues()</code>, <code class="highlighter-rouge">useDefaultValueFor()</code>, <code class="highlighter-rouge">ignoredProperties()</code>.</p>
</li>
<li>
<p>The class <code class="highlighter-rouge">net.sourceforge.pmd.lang.rule.AbstractDelegateRule</code> has been deprecated and will
be removed with PMD 7.0.0. It is internally only in use by RuleReference.</p>
</li>
<li>
<p>The default constructor of <code class="highlighter-rouge">net.sourceforge.pmd.lang.rule.RuleReference</code> has been deprecated
and will be removed with PMD 7.0.0. RuleReferences should only be created by providing a Rule and
a RuleSetReference. Furthermore the following methods are deprecated: <code class="highlighter-rouge">setRuleReference()</code>,
<code class="highlighter-rouge">hasOverriddenProperty()</code>, <code class="highlighter-rouge">usesDefaultValues()</code>, <code class="highlighter-rouge">useDefaultValueFor()</code>.</p>
</li>
</ul>
<h4 id="670">6.7.0</h4>
<ul>
<li>
<p>All classes in the package <code class="highlighter-rouge">net.sourceforge.pmd.lang.dfa.report</code> have been deprecated and will be removed
with PMD 7.0.0. This includes the class <code class="highlighter-rouge">net.sourceforge.pmd.lang.dfa.report.ReportTree</code>. The reason is,
that this class is very specific to Java and not suitable for other languages. It has only been used for
<code class="highlighter-rouge">YAHTMLRenderer</code>, which has been rewritten to work without these classes.</p>
</li>
<li>
<p>The nodes RUNSIGNEDSHIFT and RSIGNEDSHIFT are deprecated and will be removed from the AST with PMD 7.0.0.
These represented the operator of ShiftExpression in two cases out of three, but they’re not needed and
make ShiftExpression inconsistent. The operator of a ShiftExpression is now accessible through
ShiftExpression#getOperator.</p>
</li>
</ul>
<h4 id="650">6.5.0</h4>
<ul>
<li>
<p>The utility class <code class="highlighter-rouge">net.sourceforge.pmd.lang.java.ast.CommentUtil</code> has been deprecated and will be removed
with PMD 7.0.0. Its methods have been intended to parse javadoc tags. A more useful solution will be added
around the AST node <code class="highlighter-rouge">FormalComment</code>, which contains as children <code class="highlighter-rouge">JavadocElement</code> nodes, which in
turn provide access to the <code class="highlighter-rouge">JavadocTag</code>.</p>
<p>All comment AST nodes (<code class="highlighter-rouge">FormalComment</code>, <code class="highlighter-rouge">MultiLineComment</code>, <code class="highlighter-rouge">SingleLineComment</code>) have a new method
<code class="highlighter-rouge">getFilteredComment()</code> which provide access to the comment text without the leading <code class="highlighter-rouge">/*</code> markers.</p>
</li>
<li>
<p>The method <code class="highlighter-rouge">AbstractCommentRule.tagsIndicesIn()</code> has been deprecated and will be removed with
PMD 7.0.0. It is not very useful, since it doesn’t extract the information
in a useful way. You would still need check, which tags have been found, and with which
data they might be accompanied.</p>
</li>
</ul>
<h4 id="640">6.4.0</h4>
<ul>
<li>The following classes in package <code class="highlighter-rouge">net.sourceforge.pmd.benchmark</code> have been deprecated: <code class="highlighter-rouge">Benchmark</code>, <code class="highlighter-rouge">Benchmarker</code>,
<code class="highlighter-rouge">BenchmarkReport</code>, <code class="highlighter-rouge">BenchmarkResult</code>, <code class="highlighter-rouge">RuleDuration</code>, <code class="highlighter-rouge">StringBuilderCR</code> and <code class="highlighter-rouge">TextReport</code>. Their API is not supported anymore
and is disconnected from the internals of PMD. Use the newer API based around <code class="highlighter-rouge">TimeTracker</code> instead, which can be found
in the same package.</li>
<li>The class <code class="highlighter-rouge">net.sourceforge.pmd.lang.java.xpath.TypeOfFunction</code> has been deprecated. Use the newer <code class="highlighter-rouge">TypeIsFunction</code> in the same package.</li>
<li>The <code class="highlighter-rouge">typeof</code> methods in <code class="highlighter-rouge">net.sourceforge.pmd.lang.java.xpath.JavaFunctions</code> have been deprecated.
Use the newer <code class="highlighter-rouge">typeIs</code> method in the same class instead..</li>
<li>The methods <code class="highlighter-rouge">isA</code>, <code class="highlighter-rouge">isEither</code> and <code class="highlighter-rouge">isNeither</code> of <code class="highlighter-rouge">net.sourceforge.pmd.lang.java.typeresolution.TypeHelper</code>.
Use the new <code class="highlighter-rouge">isExactlyAny</code> and <code class="highlighter-rouge">isExactlyNone</code> methods in the same class instead.</li>
</ul>
<h4 id="620">6.2.0</h4>
<ul>
<li>
<p>The static method <code class="highlighter-rouge">PMDParameters.transformParametersIntoConfiguration(PMDParameters)</code> is now deprecated,
for removal in 7.0.0. The new instance method <code class="highlighter-rouge">PMDParameters.toConfiguration()</code> replaces it.</p>
</li>
<li>
<p>The method <code class="highlighter-rouge">ASTConstructorDeclaration.getParameters()</code> has been deprecated in favor of the new method
<code class="highlighter-rouge">getFormalParameters()</code>. This method is available for both <code class="highlighter-rouge">ASTConstructorDeclaration</code> and
<code class="highlighter-rouge">ASTMethodDeclaration</code>.</p>
</li>
</ul>
<h4 id="610">6.1.0</h4>
<ul>
<li>The method <code class="highlighter-rouge">getXPathNodeName</code> is added to the <code class="highlighter-rouge">Node</code> interface, which removes the
use of the <code class="highlighter-rouge">toString</code> of a node to get its XPath element name (see <a href="https://github.com/pmd/pmd/issues/569">#569</a>).
<ul>
<li>The default implementation provided in <code class="highlighter-rouge">AbstractNode</code>, will
be removed with 7.0.0</li>
<li>With 7.0.0, the <code class="highlighter-rouge">Node.toString</code> method will not necessarily provide its XPath node
name anymore.</li>
</ul>
</li>
<li>
<p>The interface <code class="highlighter-rouge">net.sourceforge.pmd.cpd.Renderer</code> has been deprecated. A new interface
<code class="highlighter-rouge">net.sourceforge.pmd.cpd.renderer.CPDRenderer</code> has been introduced to replace it. The main
difference is that the new interface is meant to render directly to a <code class="highlighter-rouge">java.io.Writer</code>
rather than to a String. This allows to greatly reduce the memory footprint of CPD, as on
large projects, with many duplications, it was causing <code class="highlighter-rouge">OutOfMemoryError</code>s (see <a href="https://github.com/pmd/pmd/issues/795">#795</a>).</p>
<p><code class="highlighter-rouge">net.sourceforge.pmd.cpd.FileReporter</code> has also been deprecated as part of this change, as it’s no longer needed.</p>
</li>
</ul>
<h4 id="601">6.0.1</h4>
<ul>
<li>The constant <code class="highlighter-rouge">net.sourceforge.pmd.PMD.VERSION</code> has been deprecated and will be removed with PMD 7.0.0.
Please use <code class="highlighter-rouge">net.sourceforge.pmd.PMDVersion.VERSION</code> instead.</li>
</ul>
<h3 id="list-of-currently-deprecated-rules">List of currently deprecated rules</h3>
<ul>
<li>
<p>The Java rules <a href="pmd_rules_java_codestyle.html#variablenamingconventions"><code class="highlighter-rouge">VariableNamingConventions</code></a>, <a href="pmd_rules_java_codestyle.html#misleadingvariablename"><code class="highlighter-rouge">MIsLeadingVariableName</code></a>,
<a href="pmd_rules_java_codestyle.html#suspiciousconstantfieldname"><code class="highlighter-rouge">SuspiciousConstantFieldName</code></a>, and <a href="pmd_rules_java_codestyle.html#avoidprefixingmethodparameters"><code class="highlighter-rouge">AvoidPrefixingMethodParameters</code></a> are
now deprecated, and will be removed with version 7.0.0. They are replaced by the more general
<a href="pmd_rules_java_codestyle.html#fieldnamingconventions"><code class="highlighter-rouge">FieldNamingConventions</code></a>, <a href="pmd_rules_java_codestyle.html#formalparameternamingconventions"><code class="highlighter-rouge">FormalParameterNamingConventions</code></a>, and
<a href="pmd_rules_java_codestyle.html#localvariablenamingconventions"><code class="highlighter-rouge">LocalVariableNamingConventions</code></a>.</p>
</li>
<li>
<p>The Java rule <a href="pmd_rules_java_codestyle.html#abstractnaming"><code class="highlighter-rouge">AbstractNaming</code></a> is deprecated
in favour of <a href="pmd_rules_java_codestyle.html#classnamingconventions"><code class="highlighter-rouge">ClassNamingConventions</code></a>.</p>
</li>
<li>
<p>The Java rules <a href="pmd_rules_java_codestyle.html#whileloopsmustusebraces"><code class="highlighter-rouge">WhileLoopsMustUseBraces</code></a>, <a href="pmd_rules_java_codestyle.html#forloopsmustusebraces"><code class="highlighter-rouge">ForLoopsMustUseBraces</code></a>, <a href="pmd_rules_java_codestyle.html#ifstmtsmustusebraces"><code class="highlighter-rouge">IfStmtsMustUseBraces</code></a>, and <a href="pmd_rules_java_codestyle.html#ifelsestmtsmustusebraces"><code class="highlighter-rouge">IfElseStmtsMustUseBraces</code></a>
are deprecated. They will be replaced by the new rule <a href="pmd_rules_java_codestyle.html#controlstatementbraces"><code class="highlighter-rouge">ControlStatementBraces</code></a>.</p>
</li>
<li>
<p>The Java rules <a href="pmd_rules_java_design.html#ncssconstructorcount"><code class="highlighter-rouge">NcssConstructorCount</code></a>, <a href="pmd_rules_java_design.html#ncssmethodcount"><code class="highlighter-rouge">NcssMethodCount</code></a>, and <a href="pmd_rules_java_design.html#ncsstypecount"><code class="highlighter-rouge">NcssTypeCount</code></a> have been
deprecated. They will be replaced by the new rule <a href="pmd_rules_java_design.html#ncsscount"><code class="highlighter-rouge">NcssCount</code></a> in the category <code class="highlighter-rouge">design</code>.</p>
</li>
<li>
<p>The Java rule <code class="highlighter-rouge">LooseCoupling</code> in ruleset <code class="highlighter-rouge">java-typeresolution</code> is deprecated. Use the rule with the same name from category <code class="highlighter-rouge">bestpractices</code> instead.</p>
</li>
<li>
<p>The Java rule <code class="highlighter-rouge">CloneMethodMustImplementCloneable</code> in ruleset <code class="highlighter-rouge">java-typeresolution</code> is deprecated. Use the rule with the same name from category <code class="highlighter-rouge">errorprone</code> instead.</p>
</li>
<li>
<p>The Java rule <code class="highlighter-rouge">UnusedImports</code> in ruleset <code class="highlighter-rouge">java-typeresolution</code> is deprecated. Use the rule with
the same name from category <code class="highlighter-rouge">bestpractices</code> instead.</p>
</li>
<li>
<p>The Java rule <code class="highlighter-rouge">SignatureDeclareThrowsException</code> in ruleset <code class="highlighter-rouge">java-typeresolution</code> is deprecated. Use the rule with the same name from category <code class="highlighter-rouge">design</code> instead.</p>
</li>
<li>
<p>The Java rule <code class="highlighter-rouge">EmptyStaticInitializer</code> in ruleset <code class="highlighter-rouge">java-empty</code> is deprecated. Use the rule <a href="pmd_rules_java_errorprone.html#emptyinitializer"><code class="highlighter-rouge">EmptyInitializer</code></a>, which covers both static and non-static empty initializers.`</p>
</li>
<li>
<p>The Java rules <code class="highlighter-rouge">GuardDebugLogging</code> (ruleset <code class="highlighter-rouge">java-logging-jakarta-commons</code>) and <code class="highlighter-rouge">GuardLogStatementJavaUtil</code>
(ruleset <code class="highlighter-rouge">java-logging-java</code>) have been deprecated. Use the rule <a href="pmd_rules_java_bestpractices.html#guardlogstatement"><code class="highlighter-rouge">GuardLogStatement</code></a>, which covers all cases regardless of the logging framework.</p>
</li>
<li>
<p>The Java rule <a href="pmd_rules_java_multithreading.html#unsynchronizedstaticdateformatter"><code class="highlighter-rouge">UnsynchronizedStaticDateFormatter</code></a> has been deprecated and
will be removed with PMD 7.0.0. The rule is replaced by the more general
<a href="pmd_rules_java_multithreading.html#unsynchronizedstaticformatter"><code class="highlighter-rouge">UnsynchronizedStaticFormatter</code></a>.</p>
</li>
</ul>
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