Instead of having DAO for each entity, calling Generic DAO simplify the program.
Unlike the template classes with empty method that can only use the method specified in Generic DAO classes, this example use additional customized method (Source Code)

package com.ns.spring.dao.template;

import java.util.List;

import com.ns.spring.dao.GenHbDao;
import com.ns.spring.model.RMA_LINE;

public interface RmaLineDao extends GenHbDao<RMA_LINE, String> {

	public List<Object[]> getListRmaLineBySql(String rmaNum, String rmaLineNum);
	public RMA_LINE getRmaLineByHql(String rmaNum, String rmaLineNum);
}

package com.ns.spring.dao.template.impl;
package com.ns.spring.dao.template.impl;

import java.util.List;

import org.hibernate.Query;
import org.springframework.stereotype.Repository;

import com.ns.spring.dao.GenHbDaoImpl;
import com.ns.spring.dao.template.RmaLineDao;
import com.ns.spring.model.RMA_LINE;

@Repository
public class RmaLineDaoImpl extends GenHbDaoImpl<RMA_LINE, String> implements RmaLineDao {

	@SuppressWarnings("unchecked")
	@Override
	public List<Object[]> getListRmaLineBySql(String rmaNum, String rmaLineNum) {
		
		StringBuilder sb = new StringBuilder();
		sb.append("\n");
		sb.append("SELECT\n");
		sb.append("  rl.rma_num\n");
		sb.append(" ,rl.rma_line_num\n");
		sb.append(" ,rl.rma_line_sts_cd\n");
		sb.append(" ,sts.rma_hdr_sts_nm\n");
		sb.append(" ,rl.mdse_cd\n");
		sb.append(" ,mdse.mdse_nm\n");
		sb.append(" ,rl.qty\n");
		sb.append(" ,rl.rma_id\n");
		sb.append("FROM RMA_LINE rl\n");
		sb.append("LEFT OUTER JOIN RMA_HDR_STS sts\n");
		sb.append("ON rl.rma_line_sts_cd = sts.rma_hdr_sts_cd\n");
		sb.append("LEFT OUTER JOIN MDSE mdse\n");
		sb.append("ON rl.mdse_cd = mdse.mdse_cd\n");
		sb.append("WHERE rl.rma_num = :rmaNum\n");
		if (rmaLineNum != null) {
			sb.append("AND rl.rma_line_num = :rmaLineNum\n");
		}		
		sb.append("ORDER BY\n");
		sb.append("  rl.rma_num\n");
		sb.append(" ,rl.rma_line_num\n");

		Query query = super.getCurrSession().createSQLQuery(sb.toString());
		query.setParameter("rmaNum", rmaNum);
		if (rmaLineNum != null) {
			query.setParameter("rmaLineNum", rmaLineNum);
		}
		List<Object[]> list = query.list();
		return list;
	}
	
	@SuppressWarnings("unchecked")
	@Override
	public RMA_LINE getRmaLineByHql(String rmaNum, String rmaLineNum) {

		String hqlStr = "from RMA_LINE " 
				+ "where rma_num = :rmaNum "
				+ "and   rma_line_num = :rmaLineNum ";
		
		Query query = super.getCurrSession().createQuery(hqlStr);
		query.setParameter("rmaNum", rmaNum);
		query.setParameter("rmaLineNum", rmaLineNum);

		List<RMA_LINE> list = query.list();
		if (list != null && list.size() > 0) {
			return (RMA_LINE) list.get(0);
		}
		return null;
	}
}

DAO interface, and it’s implementation has two additional methods:
1. Native SQL with its reesult
2. HQL with its reesult

package com.ns.spring.service.template;

import java.util.List;

import com.ns.spring.model.RMA_LINE;
import com.ns.spring.service.GenHbService;

public interface RmaLineService extends GenHbService<RMA_LINE, String> {

	public List<Object[]> getListRmaLineBySql(String rmaNum, String rmaLineNum);
	public RMA_LINE getRmaLineByHql(String rmaNum, String rmaLineNum);
}

package com.ns.spring.service.template.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.ns.spring.dao.GenHbDao;
import com.ns.spring.dao.template.RmaLineDao;
import com.ns.spring.model.RMA_LINE;
import com.ns.spring.service.GenHbServiceImpl;
import com.ns.spring.service.template.RmaLineService;

@Service("rmaLineService")
public class RmaLineServiceImpl extends GenHbServiceImpl<RMA_LINE, String> implements RmaLineService {

	private RmaLineDao dao;

	public RmaLineServiceImpl() {
	}

	@Autowired
	public RmaLineServiceImpl(@Qualifier("rmaLineDaoImpl") GenHbDao<RMA_LINE, String> genericDao) {
		super(genericDao);
		this.dao = (RmaLineDao) genericDao;
	}
	
	@Override
	@Transactional
	public List<Object[]> getListRmaLineBySql(String rmaNum, String rmaLineNum) {
		return this.dao.getListRmaLineBySql(rmaNum, rmaLineNum);
	}

	@Override
	@Transactional
	public RMA_LINE getRmaLineByHql(String rmaNum, String rmaLineNum) {
		return this.dao.getRmaLineByHql(rmaNum, rmaLineNum);
	}
}

DAO service interface, and it’s implementation calling super class, and two custom method defined in RmaLineDaoImpl.