When using netty, I found in a Handler can only have one Protocbuf file, don't let he can only choose one, is that so?

Cp. AddLast (new ProtobufDecoder (PacketProto. Packet. GetDefaultInstance ()));
Cp. AddLast (new ProtobufDecoder (PeopleProto. People. GetDefaultInstance ()));

As such, I added two new words, so only the first play, the second one doesn't work (tried)
How is this to return a responsibility excuse me?