nal=true#RUNTIME" title="class or interface in java.lang.annotation" class="externalLink">RUNTIME</a>)
public @interface <span class="memberNameLabel">MapKeyJoinColumns</span></pre>
<div class="block">Supports composite map keys that reference entities.  
 <p> The <code>MapKeyJoinColumns</code> annotation groups
 <code>MapKeyJoinColumn</code> annotations.  When the
 <code>MapKeyJoinColumns</code> annotation is used, both the
 <code>name</code> and the <code>referencedColumnName</code>
 elements must be spec