whether multiple calls to the Bootstrap.handler() method are effective?

[R1C4D0]

I noticed that in the no-argument constructor of the NettyRpcClient class, the bootstrap.handler() method is called twice. Will the ChannelInitializer added by the second call overwrite the LoggingHandler added by the first call?

public NettyRpcClient() {
//....
Bootstrap bootstrap = = new Bootstrap();
bootstrap
.handler(new LoggingHandler(LogLevel.INFO))
//...
.handler(new ChannelInitializer() {
@OverRide
protected void initChannel(SocketChannel ch) {
ChannelPipeline p = ch.pipeline();
// If no data is sent to the server within 15 seconds, a heartbeat request is sent
p.addLast(new IdleStateHandler(0, 5, 0, TimeUnit.SECONDS));
p.addLast(new RpcMessageEncoder());
p.addLast(new RpcMessageDecoder());
p.addLast(new NettyRpcClientHandler());
}
});
}

The handler() method of the Bootstrap class is as follows:

public B handler(ChannelHandler handler) {
this.handler = ObjectUtil.checkNotNull(handler, "handler");
return self();
}
Will the second handler overwrite the first handler?