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

        if (messageBuilder_ == null) {
          message_ = java.util.Collections.emptyList();
          bitField0_ = (bitField0_ & ~0x00000002);
        } else {
          messageBuilder_.clear();
        }
        chatGroupId_ = "";

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