nt tree to be serialized. Must not be null.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>String instance with serialized JSON data.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="../../../javax/json/bind/JsonbException.html" title="class in javax.json.bind">JsonbException</a></code> - If any unexpected problem occurs during the
 serialization, such as I/O error.</dd>
<dd><code><a href="http://docs.oracle.com/javase/8/docs/api/java/lang/NullPointerException.html?is-e