hing for observer methods for an event, the container considers
 the type and qualifiers of the event parameter.
 </p>

 <p>
 If the event parameter does not explicitly declare any qualifier, the observer method observes events with no qualifier.
 </p>

 <p>
 The event parameter type may contain a type variable or wildcard.
 </p>

 <p>
 In addition to the event parameter, observer methods may declare additional parameters, which may declare qualifiers. These
 additional parameters are injection points.
 </p