Mine

public class DepartmentConverter implements Converter {

	List<SiDepartment> list;
	
	public DepartmentConverter(List<SiDepartment> list){
		this.list = list;
	}

	public Object getAsObject(FacesContext arg0, UIComponent arg1, String arg2) {
		for(SiDepartment item : list){
			if(item.getPsDeptID().toString().equals(arg2))
				return item;
		}
		return null;
	}

	public String getAsString(FacesContext arg0, UIComponent arg1, Object arg2) {
		return ((SiDepartment)arg2).getPsDeptID().toString();
	}

}