Well, that's a decent first cut, but in practice it might be more elegant to use custom constraints instead of the ones built into Hibernate Validator:

public class Location {
 private String country;
 private String zip;

 @NotNull
 @Country
 public String getCountry() { return country; }
 public void setCountry(String c) { country = c; }

 @NotNull
 @ZipCode
 public String getZip() { return zip; }
 public void setZip(String z) { zip = z; }
}