JAXRS 2.2 has the new close api to allow close all resources with cascading effect.
/**

• Close the broadcaster and release any resources associated with it. The closing of
• registered {@link SseEventSink} is controlled by the {@code cascading} parameter.
  * <p>
  * Subsequent calls have no effect and are ignored. Once the {@link SseBroadcaster} is closed,
  * invoking any other method on the broadcaster instance would result in an
  * {@link IllegalStateException} being thrown.
  *
  * @param cascading Boolean value that controls closing of registered {@link SseEventSink}
• instances.
  */
  public void close(boolean cascading)
  {

}