building_extensible_java_frameworks_handler_instantiation.java

// Get the handler type from the @Handler annotation
Class<? extends AnnotationHandler> handlerType = annotation.annotationType().getAnnotation(Handler.class).value();
// Get and invoke the only constructor (which needs to be an empty one, unless you need a more complex behavior)
AnnotationHandler handler = (AnnotationHandler) Stream.of(handlerType.getConstructors())
  .findFirst()
  .get()
  .newInstance(new Object[0]);