public List getCity() {   //方法
        // TODO Auto-generated method stub
        session = HibernateSessionFactory.getSession();
        List list  =  session.createQuery("select new com.snzo.dao.WorldOnlinePortCity(wp.id,wp.name) from WorldOnlinePortCity as wp").list();    //用过直接 new WorldOnlinePortCity(wp.id,wp.name)
        session.close();
        return list ;
    }

    public static void main(String []args){  测试 
        List list = new City_Imp().getCity();
        for(Iterator it = list.iterator();it.hasNext();){
            WorldOnlinePortCity goods = (WorldOnlinePortCity)it.next();
            System.out.println(goods.getId());
        }
    }
      
    public class WorldOnlinePortCity implements java.io.Serializable {   //持久化类

    // Fields

    private Long id;       
    private String name;    
    private String des;  
    private Set city;        
    // Constructors

    /** default constructor */
    public WorldOnlinePortCity() {  //默认构造
    }

    /** minimal constructor */
//    public WorldOnlinePortCity(Long id) {
//        this.id = id;
//    }

    /** full constructor */
    public WorldOnlinePortCity(Long id, String name, String des,Set city) {   //构造函数
        this.id = id;
        this.name = name;
        this.des = des;
        this.city=city;    //Set 类型 不写也试验过 报一样的错。
    }   不管 怎么写 都这这样的错误  
  错误:
Exception in thread "main" org.hibernate.hql.ast.QuerySyntaxException: Unable to locate appropriate constructor on class [com.snzo.dao.WorldOnlinePortCity] [select new com.snzo.dao.WorldOnlinePortCity(wp.id,wp.name) from com.snzo.dao.WorldOnlinePortCity as wp]
    at org.hibernate.hql.ast.ErrorCounter.throwQueryException(ErrorCounter.java:59)
    at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:225)
    at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:158)
    at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:109)
    at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:75)
    at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:54)
    at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:71)
    at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)
    at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)
    at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1583)
    at com.snzo.bo.City_Imp.getCity(City_Imp.java:75)
    at com.snzo.bo.City_Imp.main(City_Imp.java:81)
Caused by:  Unable to locate appropriate constructor on class [com.snzo.dao.WorldOnlinePortCity]
[cause=org.hibernate.PropertyNotFoundException: no appropriate constructor in class: com.snzo.dao.WorldOnlinePortCity]
    at org.hibernate.hql.ast.tree.ConstructorNode.resolveConstructor(ConstructorNode.java:122)
    at org.hibernate.hql.ast.tree.ConstructorNode.prepare(ConstructorNode.java:88)
    at org.hibernate.hql.ast.HqlSqlWalker.processConstructor(HqlSqlWalker.java:837)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectExpr(HqlSqlBaseWalker.java:1952)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectExprList(HqlSqlBaseWalker.java:1821)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectClause(HqlSqlBaseWalker.java:1392)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:553)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281)
    at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229)
    at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:218)
    ... 10 more
    // 在线查了很多资料 依然没有找到原因 在线等 高手 解答 谢谢.