Question

当我尝试执行jpql查询时，我收到此异常。我的EJB接口和实现它的DAO是：

// Bitmask of 'width' bits shifted 'shift' bits to the left
// For instance, mask<16,8> := 0x00FFFF00 
template <uint8_t width, uint8_t shift=0>
struct mask {
    static const uintmax_t value = (width >= (sizeof(uintmax_t)<<3)) ?
            (~0 << shift) : (((uintmax_t(1)<<width)-1) << shift) ;
    mask()=delete;
};

// A bitmask for a type, for instance, 0xFF for uint8_t
template <class T>
struct typeMask {
    static const uintmax_t value = mask<sizeof(T)<<3>::value;
    typeMask()=delete;
};

和

@Local
 public interface DeckInter {

 String findDeck(String name);

  }

我正在进行＆＃34;测试＆＃34;返回，因为第一个抛出异常。 persistence.xml是：

@Stateless
public class DeckDAO implements DeckInter {

@PersistenceContext(unitName = "NewPersistenceUnit")
private EntityManager em;



private List<Deck> deckList;

public String findDeck(String name) {



    try {
        Query query = em.createQuery("select d from Deck d");
        deckList = query.getResultList();
        return deckList.get(0).getDname();
    } catch (Exception e) {
        e.printStackTrace();
    }



return "test";
}

<?xml version="1.0" encoding="UTF-8"?>

和完整的堆栈跟踪：

<persistence-unit name="NewPersistenceUnit" transaction-type="JTA">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <jta-data-source>stonesqlserver</jta-data-source>
    <class>hs.Deck</class>
    <properties>
            <property name="hibernate.transaction.jta.platform" value="org.hibernate.service.jta.platform.internal.SunOneJtaPlatform" />
            <property name="hibernate.hbm2ddl.auto" value="update"/>
            <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/>
        </properties>
</persistence-unit>

提前谢谢。

Answer 1

找到解决方案：

 @Resource
protected SessionContext context;

DAO中需要

，就像持久化上下文注释一样。

java.lang.IllegalStateException：EntityManagerFactory已关闭（Glassfish）

1 个答案: