使用但可序列化方法的sse事件不起作用

Question

return Flux.create(sink -> { FluxSink<String> serialize = sink.serialize(); MessageHandler handler = msg -> serialize.next(String.class.cast(msg.getPayload())); serialize.setCancellation(() -> filesChannel().unsubscribe(handler)); filesChannel().subscribe(handler); });

类型FluxSink的serialize（）方法未定义