获取 org.hibernate.HibernateException：未配置 CurrentSessionContext！尝试连接到 heroku-postgresql Hibernate 时

Question

我收到此错误：org.hibernate.HibernateException: No CurrentSessionContext configured!

尝试连接到 Heroku Postgres DB 时。

这是我的休眠配置（我称之为：hibernateUser.cfg.xml）：

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-configuration SYSTEM 
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

   <session-factory>

    <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
    <property name="hibernate.connection.url">jdbc:postgresql://ec2-54-243-213-188.compute-1.amazonaws.com:5432/dess6n165jarrv</property>
    <property name="hibernate.connection.username">user</property>
    <property name="hibernate.connection.password">password</property>

    <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>

    <property name="hibernate.default_schema">dess6n165jarrv</property>
    <property name= "hbm2ddl.auto">update</property>

    <property name="hibernate.current_session_context_class">thread</property>

   </session-factory>

</hibernate-configuration>

在此处输入代码

我将其实现为单例：

public static HibernateUserDAO getInstance(HttpServletResponse response) throws IOException 
    {   

        instance = new HibernateUserDAO();
        if (instance == null)
        {
            userFactory = new Configuration().configure("hibernateUser.cfg.xml").addAnnotatedClass(AppUser.class).buildSessionFactory();
        }
        return instance;
    }


    public void addNewUser(AppUser user) throws UserExceptionHandler, IOException 
    {   

        Session session = null; 

        int id = 0;
        try
        {
            session = userFactory.getCurrentSession();

            session.beginTransaction();
            session.save(user);
            session.getTransaction().commit();


        }catch (HibernateException e) 
        {
            if (session.getTransaction() != null) session.getTransaction().rollback();
            throw new HibernateException (e);
        }finally 
        {
            try 
            {session.close();} 
            catch (HibernateException e)
            {
                throw new UserExceptionHandler("Warnning!! connection did'nt close properly");
            } 
        }
        if (id != 0) 
            System.out.println("User created successfully");    

    }

enter code here

我在这一行收到错误：

session = userFactory.getCurrentSession();

我认为错误在我的配置文件中，但我看不出问题出在哪里（我看了几个例子并复制了它）

Answer 1

您需要像这样动态设置连接参数：

Map<String,String> jdbcUrlSettings = new HashMap<>();
String jdbcDbUrl = System.getenv("JDBC_DATABASE_URL");
if (null != jdbcDbUrl) {
  jdbcUrlSettings.put("hibernate.connection.url", System.getenv("JDBC_DATABASE_URL"));
}

registry = new StandardServiceRegistryBuilder().
    configure("hibernate.cfg.xml").
    applySettings(jdbcUrlSettings).
    build();

这样，它们就不会被硬编码，并且会采用平台所做的更改。有关详细信息，请参阅 Using the DATABASE_URL with Hibernate。

获取 org.hibernate.HibernateException：未配置 CurrentSessionContext！尝试连接到 heroku-postgresql Hibernate 时

getting org.hibernate.HibernateException: No CurrentSessionContext configured! when trying to connect to heroku-postgresql Hibernate

java

postgresql

hibernate

heroku

sessionfactory