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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">jakarta.ws.rs</a></div>
<h2 title="Annotation Type MatrixParam" class="title">Annotation Type MatrixParam</h2>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Target.html?is-external=true" title="class or interface in java.lang.annotation" class="externalLink">@Target</a>({<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/ElementType.html?is-external=true#PARAMETER" title="class or interface in java.lang.annotation" class="externalLink">PARAMETER</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/ElementType.html?is-external=true#METHOD" title="class or interface in java.lang.annotation" class="externalLink">METHOD</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/ElementType.html?is-external=true#FIELD" title="class or interface in java.lang.annotation" class="externalLink">FIELD</a>})
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Retention.html?is-external=true" title="class or interface in java.lang.annotation" class="externalLink">@Retention</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/RetentionPolicy.html?is-external=true#RUNTIME" title="class or interface in java.lang.annotation" class="externalLink">RUNTIME</a>)
<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Documented.html?is-external=true" title="class or interface in java.lang.annotation" class="externalLink">@Documented</a>
public @interface <span class="memberNameLabel">MatrixParam</span></pre>
<div class="block">Binds the value(s) of a URI matrix parameter to a resource method parameter, resource class field, or resource class
bean property. Values are URL decoded unless this is disabled using the <a href="Encoded.html" title="annotation in jakarta.ws.rs"><code>Encoded</code></a> annotation. A default value
can be specified using the <a href="DefaultValue.html" title="annotation in jakarta.ws.rs"><code>DefaultValue</code></a> annotation.
<p>
Note that the <code>@MatrixParam</code> <a href="#value()"><code>annotation value</code></a> refers to a name of a matrix parameter that
resides in the last matched path segment of the <a href="Path.html" title="annotation in jakarta.ws.rs"><code>Path</code></a>-annotated Java structure that injects the value of the
matrix parameter.
</p>
<p>
The type <code>T</code> of the annotated parameter, field or property must either:
</p>
<ol>
<li>Be a primitive type</li>
<li>Have a constructor that accepts a single <code>String</code> argument</li>
<li>Have a static method named <code>valueOf</code> or <code>fromString</code> that accepts a single <code>String</code> argument
(see, for example, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true#valueOf(java.lang.String)" title="class or interface in java.lang" class="externalLink"><code>Integer.valueOf(String)</code></a>)</li>
<li>Have a registered implementation of <a href="ext/ParamConverterProvider.html" title="interface in jakarta.ws.rs.ext"><code>ParamConverterProvider</code></a> JAX-RS extension SPI that
returns a <a href="ext/ParamConverter.html" title="interface in jakarta.ws.rs.ext"><code>ParamConverter</code></a> instance capable of a "from string" conversion for the type.</li>
<li>Be <code>List&lt;T&gt;</code>, <code>Set&lt;T&gt;</code> or <code>SortedSet&lt;T&gt;</code>, where <code>T</code> satisfies 2, 3 or 4 above. The
resulting collection is read-only.</li>
</ol>
<p>
If the type is not one of the collection types listed in 5 above and the matrix parameter is represented by multiple
values then the first value (lexically) of the parameter is used.
</p>
<p>
Because injection occurs at object creation time, use of this annotation on resource class fields and bean properties
is only supported for the default per-request resource class lifecycle. Resource classes using other lifecycles
should only use this annotation on resource method parameters.
</p></div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>1.0</dd>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>Paul Sandoz, Marc Hadley</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="DefaultValue.html" title="annotation in jakarta.ws.rs"><code>DefaultValue</code></a>,
<a href="Encoded.html" title="annotation in jakarta.ws.rs"><code>Encoded</code></a>,
<a href="http://www.w3.org/DesignIssues/MatrixURIs.html">Matrix URIs</a></dd>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Required Element</th>
<th class="colLast" scope="col">Description</th>
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<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#value()">value</a></span></code></th>
<td class="colLast">
<div class="block">Defines the name of the URI matrix parameter whose value will be used to initialize the value of the annotated method
argument, class field or bean property.</div>
</td>
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<h4>value</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;value</pre>
<div class="block">Defines the name of the URI matrix parameter whose value will be used to initialize the value of the annotated method
argument, class field or bean property. The name is specified in decoded form, any percent encoded literals within
the value will not be decoded and will instead be treated as literal text. E.g. if the parameter name is "a b" then
the value of the annotation is "a b", <i>not</i> "a+b" or "a%20b".</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>URI matrix parameter name.</dd>
</dl>
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