How to use Java Map between controller and DTO?

[soul_killer]

hi
i want to ask about java Map. Basically i'm trying to do a server side validation.
i have this portion inside my method here:

	@RequestMapping(value = "addCountry", method = RequestMethod.POST)
	public String addStep(@ModelAttribute("countryDTO")
	CountryDTO countryDTO, BindingResult result, Model model,
		HttpServletRequest request)
	{

validator.validate(countryDTO, result);
			if (result.hasErrors())
			{
ResourceBundle rb = ResourceBundle.getBundle("messages");
Map<String, String> ERRORS = new HashMap<String, String>();
for (ObjectError errorobj : result.getAllErrors())
{
String code = errorobj.getCode();
String fieldName = code.substring(code.indexOf('.') + 1, code.indexOf('['));
String message = rb.getString(code);
model.addAttribute(fieldName + "error", message);
} } }

My CountryDTO:

public class CountryDTO extends CoreDTO implements Serializable 
{
	private static final long serialVersionUID = 1L;

	@NotBlank(message="code is blank")
	@Length(max=4, message="code max length is 4")
	private String code;
	
	@NotBlank(message="description is blank")
	@Length(max=4, message="description max length is 4")
	private String description;
	public String getCode()
	{
		return code;
	}
	public void setCode(String code)
	{
		this.code = code;
	}
	public String getDescription()
	{
		return description;
	}
	public void setDescription(String description)
	{
		this.description = description;
	}
}

And i have a CoreDTO that has these:

public class CoreDTO implements Serializable {
private String errMsg;
private Map<String, String> formErrors;
	public String getErrMsg()
	{
		return errMsg;
	}
	public void setErrMsg(String errMsg)
	{
		this.errMsg = errMsg;
	}
	public Map<String, String> getFormErrors()
	{
		return formErrors;
	}
	public void setFormErrors(Map<String, String> formErrors)
	{
		this.formErrors = formErrors;
	} 
}

My form:

<tr>
<td >
Code: <input name="code" id="code" type="text"
title="Country"><span><c:out value="${codeerror}" /></span></td>
</tr>
<tr>
<td>Description: <input name="description"
id="description" type="text"
title="Description"><span><c:out
value="${descriptionerror}" /></span></td>
</tr>

My question is:
1) how can i map the formErrors to the errorObjects? So, at the end how will i pass the error messages appropriately to my jsp using the mapped formErrors instead of simply passing it from message? I need all my errors collected to the CoreDTO, and countryDTO will getErrMsg from the CoreDTO.

additional info: the CoreDTO is extended to CountryDTO