Scala调用Java 泛型函数：报错

最近在用Scala调用Java的多态类。

...

bootstrap.group(bossGroup, workerGroup)
  //创建NioServerSocketChannel
  .channel(classOf[NioServerSocketChannel])
  //绑定I/O事件处理类
  .childHandler(new ChannelInitializer[SocketChannel] {
  override def initChannel(ch: SocketChannel): Unit = {
    ch.pipeline().addLast(
      //            new ObjectEncoder,
      //            new ObjectDecoder(ClassResolvers.cacheDisabled(getClass.getClassLoader)),
      new ServerHandler
    )
  }
}).option(ChannelOption.SO_BACKLOG, 128)

...

Java中的Code

public <T> B option(ChannelOption<T> option, T value) {
    if (option == null) {
        throw new NullPointerException("option");
    }
    if (value == null) {
        synchronized (options) {
            options.remove(option);
        }
    } else {
        synchronized (options) {
            options.put(option, value);
        }
    }
    return (B) this;
}

Error:(38, 31) type mismatch;
 found   : io.netty.channel.ChannelOption[Integer]
 required: io.netty.channel.ChannelOption[Any]
Note: Integer <: Any, but Java-defined class ChannelOption is invariant in type T.
You may wish to investigate a wildcard type such as `_ <: Any`. (SLS 3.2.10)
      }).option(ChannelOption.SO_BACKLOG, 128)

这个是问题。不是说Scala调用Java是无缝的吗。现在卡在这里了。想问哪位遇到过