
 this parameter must not be null.</dd>
<dd><code>replace</code> - this boolean value defines the behavior of this
 method if, when it is called, a <code>PolicyContextHandler</code> 
 has already been registered to handle the same key.
 In that case, and if the value of this argument is <code>true</code>,
 the existing handler is replaced with the argument handler. If the
 value of this parameter is false the existing registration is preserved
 and an exception is thrown.</dd>
<dt><span class="throwsLabel">