如何解决"org.hibernate.HibernateException:createCriteria无效而没有活动事务"异常？

Question

我正在使用Hibernate 4.0.1.Final编写一个独立的Java应用程序.在测试我的数据访问层时,我遇到以下异常

org.hibernate.HibernateException:没有活动事务,createCriteria无效

搜索对象时 我正在尝试将我的事务级代码与我的数据库操作代码分开.我的JUnit测试是

@Before
public void setUpDAOTest() { 
    final Configuration configuration = new Configuration();
    configuration.configure().setProperty("hibernate.show_sql", "false");
    final ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
    sessionFactory = configuration.buildSessionFactory(serviceRegistry);
    orgDao = new OrganizationDAOImpl(sessionFactory);
    session = sessionFactory.openSession();
    tx = session.beginTransaction();
}   // setUp

@Test
public void testFindStateByAbbrev() { 
    final String abbrev = testProps.getProperty("test.state.abbrev");
    final State state = orgDao.findStateByAbbrev(abbrev);
    Assert.assertNotNull(state);
    Assert.assertEquals(testProps.getProperty("test.state.abbrev"), state.getAbbrev());
}   // testFindStateByAbbrev

和单元测试调用的代码是......

public class OrganizationDAOImpl extends AbstractDAO implements OrganizationDAO {
    …
    public State findStateByAbbrev(final String abbrev) {
        State ret = null;
        final Session session = sessionFactory.getCurrentSession();
        final Criteria crit = session.createCriteria(State.class).add(Restrictions.eq("abbrev", abbrev));
        final List<State> results = crit.list();
        if (results != null && results.size() > 0) {
            ret = results.get(0);
        }   // if
        return ret;
    }

该行中的DAO抛出异常,

final Criteria crit = session.createCriteria(State.class).add(Restrictions.eq("abbrev", abbrev));

如何调整我的JUnit测试(或我的DAO代码)以消除此异常并使我的代码正常运行？这是我的hibernate.cfg.xml档案......

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

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/dbid</property>
        <property name="hibernate.connection.username">user</property>
        <property name="hibernate.connection.password">password</property>
        <property name="hibernate.connection.pool_size">10</property>
        <property name="show_sql">true</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- Enable Hibernate's automatic session context management -->
            <property name="current_session_context_class">thread</property>

        <mapping class="org.myco.myproject.orgsclient.model.Organization" />
        <mapping class="org.myco.myproject.orgsclient.model.State" />

    </session-factory>
</hibernate-configuration>

Answer 1

你可以移动

session = sessionFactory.openSession();
tx = session.beginTransaction();

在您的DAO方法内部或将新会话绑定到方法中的当前线程@Before.

你已经指定hibernate应该使用ThreadLocalSessionContext.但是,没有任何东西可以将Session绑定到当前线程.

ThreadLocalSessionContext提供了一个静态bind(org.hibernate.Session session)方法,您可以使用它确保sessionFactory.getCurrentSession()可以访问您已打开的会话.

只是打开一个新会话不会将其绑定到该线程.