for spring bean initiation, either default constructor or auto wired

great to confirm this, spring need either default constructor, or auto wired constructor

refer to

default constructor is common, then for example auto wired constructor:

@Service(value = "objectToMapConverter")
public class ObjectToMapConverter {
  private static final SimpleDateFormat SDF = new SimpleDateFormat("yyyy-MM-dd");
  private static final SimpleDateFormat SYD = new SimpleDateFormat("yyyy-MM-dd");
  static {
  private static ClientTransactionDao txDao;
  public ObjectToMapConverter(ClientTransactionDao clientTransactionDao) {
	// TODO Auto-generated constructor stub
	  txDao = clientTransactionDao;

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