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<title>FormParam (jakarta.ws.rs-api 2.1.6 API)</title>
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<div class="subTitle"><span class="packageLabelInType">Package</span>&nbsp;<a href="package-summary.html">javax.ws.rs</a></div>
<h2 title="Annotation Type FormParam" class="title">Annotation Type FormParam</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>})
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<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">FormParam</span></pre>
<div class="block">Binds the value(s) of a form parameter contained within a request entity body
to a resource method parameter. Values are URL decoded unless this is
disabled using the <a href="Encoded.html" title="annotation in javax.ws.rs"><code>Encoded</code></a> annotation. A default value can be
specified using the <a href="DefaultValue.html" title="annotation in javax.ws.rs"><code>DefaultValue</code></a> annotation.
If the request entity body is absent or is an unsupported media type, the
default value is used.
The type <code>T</code> of the annotated parameter must either:
<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 javax.ws.rs.ext"><code>ParamConverterProvider</code></a>
that returns a <a href="ext/ParamConverter.html" title="interface in javax.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
form parameter is represented by multiple values then the first value (lexically)
of the parameter is used.</p>
<p>Note that, whilst the annotation target permits use on fields and methods,
this annotation is only required to be supported 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 javax.ws.rs"><code>DefaultValue</code></a>,
<a href="Encoded.html" title="annotation in javax.ws.rs"><code>Encoded</code></a></dd>
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<h3>Required Element Summary</h3>
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<caption><span>Required Elements</span><span class="tabEnd">&nbsp;</span></caption>
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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 form parameter whose value will be used
to initialize the value of the annotated method argument.</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 form parameter whose value will be used
to initialize the value of the annotated method argument. 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>
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