public Builder mergeFrom(org.anychat.protobuf.msg.UserOfflineMsg.UserOffline other) {
        if (other == org.anychat.protobuf.msg.UserOfflineMsg.UserOffline.getDefaultInstance()) return this;
        if (!other.getUserId().isEmpty()) {
          userId_ = other.userId_;
          onChanged();
        }
        onChanged();
        return this;
      }
Protobuf type {@code org.anychat.protobuf.msg.UserOffline}
AnyChatServer/src/main/java/org/anychat/protobuf/msg/UserOfflineMsg.java