Hibernate问题

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Random;import javax.transaction.Transaction;import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;import com.wish.dao.IDAO;
import com.wish.dto.ChoutiDto;
import com.wish.factory.HibernateSessionFactory;
import com.wish.pojo.Singlesel;
import com.wish.pojo.Users;
import com.wish.pojo.Users;public class DaoImpl implements IDAO{
public boolean islogin(String code,String passward){
String pwd="";
SessionFactory factory=HibernateSessionFactory.getInstance();
Session session=factory.openSession();
Transaction trans=session.beginTransaction();
Users u=new Users();
String hql="From Users as u where u.code=?";
try{
Query q = session.createQuery(hql);
List<Users> l =q.setString(0,code).list();
Users uu = (Users)l.get(0);
pwd=uu.getPassword();
if(pwd.equals(passward)&&pwd!=""){
return true;
}else
return false;
}catch(Exception e){
return false;
}
}

public List Chouti(int s){
SessionFactory factory = HibernateSessionFactory.getInstance();
Session session = factory.openSession();
Transaction trans = session.beginTransaction();
String hql="From Singlesel";
Query q = session.createQuery(hql);
List<Singlesel> l=q.list();
Collections.shuffle(l,new Random());
List<ChoutiDto> ll=new ArrayList<ChoutiDto>();
int count=0;
for(Singlesel sl:l){
if(count<s){
ChoutiDto CD=new ChoutiDto();
CD.setSubject(sl.getSubject());
CD.setTitle(sl.getTitle());
CD.setRadioA(sl.getRadioA());
CD.setRadioB(sl.getRadioB());
CD.setRadioC(sl.getRadioC());
CD.setRadioD(sl.getRadioD());
count++;
ll.add(CD);
}
}
//for(Singlesel cd:l){

for(ChoutiDto c : ll){

System.out.println(c.getSubject()+"  "+c.getTitle()+" "+c.getRadioA()+"  "+c.getRadioB()+"  "+c.getRadioC()+"  "+c.getRadioD());

System.out.println("-------------------------------------------------------");

}
//}
return ll;
}
}错误信息如下:
Severity and Description Path Resource Location Creation Time Id
The import org.hibernate.Transaction collides with another import statement MyExamOnline/src/com/wish/Impl DaoImpl.java line 13 1197276811250 175
Severity and Description Path Resource Location Creation Time Id
Type mismatch: cannot convert from Transaction to Transaction MyExamOnline/src/com/wish/Impl DaoImpl.java line 27 1197276811250 177红色部分 提示出错!import 的时候出现的问题