服务器发送事件，nullpointer

Question

@Singleton @Path("broadcast") public class UserCreatedEventsResource {
private Sse sse;
private SseBroadcaster broadcaster;

@Inject
public UserCreatedEventsResource(@Context final Sse sse) {
    this.sse = sse;
    this.broadcaster = sse.newBroadcaster();
}

@POST
@Produces(MediaType.TEXT_PLAIN)
@Consumes(MediaType.TEXT_PLAIN)
public String broadcastMessage(String message) {
    final OutboundSseEvent event = sse.newEventBuilder()
            .name("message")
            .mediaType(MediaType.TEXT_PLAIN_TYPE)
            .data(String.class, message)
            .build();

    broadcaster.broadcast(event);

    return "Message '" + message + "' has been broadcast.";
}

@GET
@Produces(MediaType.SERVER_SENT_EVENTS)
public void listenToBroadcast(@Context SseEventSink eventSink) {
    this.broadcaster.register(eventSink);
} }

我有一个nullpointer异常，但在用maven重新导入projekt后，它消失了。

我想我曾经做过一次重建，但它没有用，现在我再做一次，工作正常。