Jdbc Data Entity with "composite" PK with one field does not work

[horiavmuntean]

Expected Behavior

The following repository works (not sure if it should because I annotate with @id multiple entity fields)

@JdbcRepository(dialect = Dialect.POSTGRES)
public interface CnvcHome extends CrudRepository<CnvModel, CnvcPK> {        
}

@Introspected(accessKind = AccessKind.FIELD) 
@MappedEntity(value = "RATES", namingStrategy = UpperCase.class)
public class CnvModel {

	@Id
	public String sym; 
	@Id
	public int dat; 

	public Timestamp uti;

	public CnvModel() {
	}
}

@Introspected(accessKind = AccessKind.FIELD)
public class CnvcPK implements Serializable {

    private static final String name = "currency-conversion record";

    public String sym;
    public int dat;

    public CnvcPK() {
    }

    public CnvcPK(String sym, int dat) {
        this.sym = sym.trim();
        this.dat = dat;
    }

    public boolean equals(Object obj) {
        if (this.getClass().equals(obj.getClass())) {
            CnvcPK that = (CnvcPK) obj;
            return this.sym.trim().equals(that.sym.trim()) && (this.dat == that.dat);
        }
        return false;
    }

    public int hashCode() {
        return (sym + dat).hashCode();
    }

    public String toString() {
        return name + ":[symbol=" + this.sym.trim() + "][date=" + this.dat + "]";
    }

}

However if I try with a repo that has a PK that has only one field like below:

@JdbcRepository(dialect = Dialect.POSTGRES)
public interface SymcHome extends CrudRepository<SymModel, SymcPK> {
}

@Introspected(accessKind = AccessKind.FIELD) 
@MappedEntity(value = "SYMC", namingStrategy = UpperCase.class)
public class SymModel {
	@Id
	public String rky;

	public String nam;

	public SymModel() {
	}
}

@Introspected(accessKind = AccessKind.FIELD)
public class SymcPK implements Serializable {

  private static final String name = "symbol record";

  public String rky;

  public SymcPK() {
  }

  public SymcPK(String rky) {
    this.rky = rky.trim();
  }

  public boolean equals(Object obj) {
    if (this.getClass().equals(obj.getClass())) {
      SymcPK that = (SymcPK) obj;
      return this.rky.trim().equals(that.rky.trim());
    }
    return false;
  }

  public int hashCode() {
    return rky.hashCode();
  }

  public String toString() {
    return name + ":[symbol code=" + this.rky.trim() + "]";
  }

}

mn can't generate what it needs to function

Compilation failed; see the compiler output below.
  error: Unable to implement Repository method: SymcHome.findById(Object id). Parameter [SymcPK id] is not compatible with property [java.lang.String rky] of entity: SymModel

My question is - how can I make the second case work without changing the fields of SymModel and SymPK ?

Thanks

Actual Behaviour

No response

Steps To Reproduce

No response

Environment Information

Windows 10
openjdk version "11.0.17" 2022-10-18 LTS

Example Application

No response

Version

4.4.4