y and
 pong. Methods using this annotation are allowed to have parameters of types described below, otherwise the container
 will generate an error at deployment time.
 <p>
 The allowed parameters are:
 <ol>
 <li>Exactly one of any of the following choices
 <ul>
 <li>if the method is handling text messages:
 <ul>
 <li><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"><code>String</code></a> to receive the w