I'm making a game with a custom server solution written in java that communicates with the game client using gRPC.

I'm attempting to pack a message (ShopData) into an "any" object, but it's saying no instance(s) of type variable(s) exist so that ShopData conforms to Message

As you can see I have a GameNetworkEvent message that contains a type flag and an "any" type payload.

I am building a ShopData payload then am attempting to pack it into the "any" eventPayload field. However the error seems to imply that ShopData isn't a message? I don't get how that can be, since it's an auto-generated class from my protobuf message definition

protobuf to code mapping

Relevant protobuf definitions

message GameNetworkEvent {
  enum Type {
    START = 0;
    SHOP = 1;
    BRAWL = 2;
    CHAT = 3;
  };
  Type eventType = 1;
  google.protobuf.Any eventPayload = 2;
}

message ShopData {
  int32 gold = 1;
  repeated UnitData units = 2;
}

message UnitData {
  string name = 1;
  int32 attack = 2;
  int32 health = 3;
  int32 cost = 4;
  bool isUpgraded = 5;
}

Message instantiation

FromBeyondProto.ShopData shop =
        FromBeyondProto.ShopData.newBuilder()
                .addAllUnits(generateRandomShop(10))
                .setGold(10)
                .build();

FromBeyondProto.GameNetworkEvent response =
        FromBeyondProto.GameNetworkEvent.newBuilder()
                .setEventType(FromBeyondProto.GameNetworkEvent.Type.SHOP)
                .setEventPayload(Any.pack(shop))
                .build();