Spring Bean Utils Copy Properties enum field not working

Trying to copy a source object which has ENUM property "valuetype"into destination object where "valuetype" is an integer. But seems like it doesn't work.

Source

import com.ns.enums.DataType;

import lombok.Getter;

@Getter
public class UpdateConfigRequest {

    private String isenabled;

    private String value;

    private DataType valuetype;
}

Target

import org.joda.time.DateTime;
import org.springframework.data.annotation.Id;
import org.springframework.data.cassandra.mapping.PrimaryKey;
import org.springframework.data.cassandra.mapping.Table;

import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;

@Table("config")
@Builder
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Config {

    @PrimaryKey
    @Id
    private String key;

    private DateTime created;

    private DateTime lastmodified;

    private boolean isenabled;

    private String value;

    private Integer valuetype;


}

*Bean Merge Class

import java.util.HashSet;
import java.util.Set;

import org.apache.commons.beanutils.PropertyUtils;
import org.joda.time.DateTime;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.BeanWrapper;
import org.springframework.beans.BeanWrapperImpl;
import org.springframework.beans.PropertyAccessorFactory;

public class BeanMerger {

        private static String[] getNullPropertyNames(Object source) {
                final BeanWrapper src = new BeanWrapperImpl(source);
                java.beans.PropertyDescriptor[] pds = src.getPropertyDescriptors();

                Set<String> emptyNames = new HashSet<String>();
                for (java.beans.PropertyDescriptor pd : pds) {
                        Object srcValue = src.getPropertyValue(pd.getName());
                        if (srcValue == null)
                                emptyNames.add(pd.getName());
                }
                String[] result = new String[emptyNames.size()];
                System.out.println(result.length);
                return emptyNames.toArray(result);
        }

        public static Object merge(Object source, Object target) {
                BeanUtils.copyProperties(source, target, getNullPropertyNames(source));
                if (propertyExists(source, "lastmodified")) {
                        BeanWrapper trgWrap = PropertyAccessorFactory.forBeanPropertyAccess(source);
                        trgWrap.setPropertyValue("lastmodified", new DateTime());
                }
                return source;
        }

        private static boolean propertyExists(Object bean, String property) {
                return PropertyUtils.isReadable(bean, property) && PropertyUtils.isWriteable(bean, property);
        }
        

}

As attached above Im trying to merge UpdateConfigRequest class to Config using the BeanMerge.merge() wrapper written on top of Spring bean utils. I see everything thing works fine, except the copy of enum value. I suspect change in the datatype from enum to int is causing the issue. Anyways to overcome this ?