neration of a
  foreign key constraint when table generation is in effect.
  If both this element and the <code>foreignKey</code>
  element of any of the <code>MapKeyJoinColumn</code>
  elements are specified, the behavior is undefined.  If no
  foreign key annotation element is specified in either
  location, the persistence provider's default foreign key
  strategy will apply.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.1</dd>
</dl>
<dl>
<dt>Default:</dt>
<dd>@jakarta.persistence.