java - 警告 :[unchecked] unchecked conversion

Question

我收到以下警告:

warning:[unchecked] unchecked conversion
[javac]found:java.util.List
[javac] required:java.util.List<edu.fullerton.cs476s09.espressobar.jpa.espressobar_milk>
return query.getResultList();

可能是什么问题和可能的解决方案？我正在使用以下代码:

@Stateless
@Remote(Order.class)
//@EntityListeners(MyListener.class)
public class OrderBean implements Order
{ 
    /**
     * The entity manager object, injected by the container
     */

    @PersistenceContext
    
    private EntityManager manager;
    
    public List<espressobar_milk> listMilk() 
    {
        Query query = manager.createQuery("SELECT m FROM espressobar_milk m");
        return query.getResultList();
    }...
.....
..}

Answer 1

我正在使用 EJB 3.1 并且遇到了同样的问题。我找到了另一个解决方案:

TypedQuery<espressobar_milk> query = manager.createQuery("SELECT m FROM espressobar_milk m", espressobar_milk.class);         
return query.getResultList(); 

这解决了未经检查的对话警告(您不再需要@SuppressWarnings 注释)。