public Builder clear() {
        super.clear();
        wsOpCode_ = "";

        endChatId_ = "";

        chatGroupId_ = "";

        return this;
      }
Protobuf type {@code org.anychat.protobuf.ws.GroupMessageReceiveC}
AnyChatServer/src/main/java/org/anychat/protobuf/ws/LoginChatProto.java