如何解決異常org.hibernate.SessionException：會話已關閉

Question

我是Hibernate的新手，我自己在做一些編程，直到遇到此問題。我正在嘗試將一個對象添加到數據庫中，然後從數據庫中檢索該對象。我曾嘗試在網上尋求幫助，但一直未能解決此錯誤。任何幫助，將不勝感激。堆棧跟蹤我得到：

Exception in thread "main" org.hibernate.SessionException: Session was already closed 
    at org.hibernate.internal.SessionImpl.close(SessionImpl.java:359) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
    at java.lang.reflect.Method.invoke(Unknown Source) 
    at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:356) 
    at com.sun.proxy.$Proxy6.close(Unknown Source) 
    at com.project.hibernate.HibernateTest.main(HibernateTest.java:39) 

這是迄今爲止我所編寫的代碼：

HiberateTest.java

public class HibernateTest { 

    public static void main(String[] args) { 
     Logger log = LoggerFactory.getLogger(HibernateTest.class); 

     UserDetails user = new UserDetails(); 
     log.debug("Testing"); 
     user.setUserId(1); 
     user.setUserName("First User"); 
     user.setAddress("First user's address"); 
     user.setJoinedDate(new Date()); 
     user.setDescription("user description"); 

     Configuration configuration = new Configuration(); 
     configuration.configure("com/project/hibernate/hibernate.cfg.xml"); 
     ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(
       configuration.getProperties()).build(); 
     SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry); 

     Session session = sessionFactory.getCurrentSession(); 

     //add object 
     session.beginTransaction(); 
     session.save(user); 
     session.getTransaction().commit(); 
     session.close(); 

     //retrieve object that was added 
     session = sessionFactory.openSession(); 
     user = null; 
     session.beginTransaction(); 
     user = (UserDetails) session.get(UserDetails.class,1); 
     session.getTransaction().commit(); 
     session.close(); 

     System.out.println("User Name retrieved is " + user.getUserName()); 

    } 
} 

UserDetails.java

@Entity 
@Table(name="USER_DETAILS") 
public class UserDetails { 
    @Id 
    private int userId; 

    private String userName; 
    @Temporal(TemporalType.DATE) 

    private Date joinedDate; 
    private String address; 

    private String description; 

    public Date getJoinedDate() { 
     return joinedDate; 
    } 
    public void setJoinedDate(Date joinedDate) { 
     this.joinedDate = joinedDate; 
    } 
    public String getAddress() { 
     return address; 
    } 
    public void setAddress(String address) { 
     this.address = address; 
    } 
    public String getDescription() { 
     return description; 
    } 
    public void setDescription(String description) { 
     this.description = description; 
    } 

    public int getUserId() { 
     return userId; 
    } 
    public void setUserId(int userId) { 
     this.userId = userId; 
    } 
    public String getUserName() { 
     return userName; 
    } 
    public void setUserName(String userName) { 
     this.userName = userName; 
    } 

} 

的hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?> 
<!DOCTYPE hibernate-configuration PUBLIC 
     "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 
     "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> 

<hibernate-configuration> 

    <session-factory> 

     <!-- Database connection settings --> 
     <property name="connection.driver_class">org.h2.Driver</property> 
     <property name="connection.url">jdbc:h2:~/test</property> 
     <property name="connection.username">sa</property> 
     <property name="connection.password">v15t4.</property> 

     <!-- JDBC connection pool (use the built-in) --> 
     <property name="connection.pool_size">1</property> 

     <!-- SQL dialect --> 
     <property name="dialect">org.hibernate.dialect.H2Dialect</property> 

     <!-- Disable the second-level cache --> 
     <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property> 

     <!-- Echo all executed SQL to stdout --> 
     <property name="show_sql">true</property> 

     <!-- Drop and re-create the database schema on startup --> 
     <property name="hbm2ddl.auto">create</property> 

     <property name="hibernate.current_session_context_class"> 
      org.hibernate.context.internal.ThreadLocalSessionContext 
     </property> 

     <mapping class="com.project.hibernate.UserDetails" /> 

    </session-factory> 

</hibernate-configuration> 

Answer 1

我設法通過刪除我的

Session session = sessionFactory.getCurrentSession() 

與

openSession() 

Answer 2

不要當你保存對象關閉會話來解決這個問題。 嘗試刪除session.close（）;