bsp;value</pre>
<div class="block">A class implementing <a href="../../../spi/Extension.html" title="interface in jakarta.enterprise.inject.spi"><code>Extension</code></a> that is expected to mirror the functionality of the annotated
 build compatible extension.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>a portable extension class</dd>
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