调用sessionFactory.openSession（）时为NullPointer；

Question

我正在关注

java.lang.NullPointerException at com.xyz.bank.dao.AccountDao.saveAccount(AccountDao.java:32)
    com.xyz.bank.service.AccountService.saveNewlyCreatedCustomer(AccountService.java:65)

AccountDao的第32行是Session session = sessionFactory.openSession();

我正在尝试打开会话，但是得到了一个空指针。谁能看看我所做的配置，然后让我知道我要去哪里了。

dispatcher-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">

    <context:component-scan base-package="com.xyz.bank"></context:component-scan>

    <bean id="viewResolver"
          class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix">
            <value>/WEB-INF/</value>
        </property>
        <property name="suffix">
            <value>.jsp</value>
        </property>
    </bean>

    <!-- dataSource Bean using DriverManagerDataSource to connect Database -->
    <bean id="sessionFactory"
          class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
        <property name="dataSource"
                  ref="dataSource"/>
        <property name="packagesToScan"
                  value="com.xyz.bank"/>
        <property name="annotatedClasses">
            <list>
                <value>com.xyz.bank.bean.Account</value>
                <value>com.xyz.bank.bean.Customer</value>
            </list>
        </property>
        <property name="hibernateProperties">
        <props>
            <prop key="hibernate.hbm2ddl.auto">
                create-drop
            </prop>
            <prop key="hibernate.dialect">
                org.hibernate.dialect.H2Dialect
            </prop>
        </props>
    </property>
    </bean>
    <bean id="dataSource"
          class="org.apache.tomcat.dbcp.dbcp2.BasicDataSource">
        <property name="driverClassName" value="org.h2.Driver"/>
        <property name="url" value="jdbc:h2:~/test"/>
        <property name="username" value="sa"/>
        <property name="password" value=""/>
    </bean>
    <bean id="txManager"
          class="org.springframework.orm.hibernate5.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>
</beans>

AccountDao

@Repository
public class AccountDao {

    @Autowired
    SessionFactory sessionFactory;

    public List<Customer> customers;

    public String saveAccount(Account account) {
        List<Account> accounts = new ArrayList<>();
        System.out.println(account.getBalance());
        System.out.println(account.getAccountID());
        boolean xyz = accounts.add(account);
        System.out.println(xyz);

        Session session = sessionFactory.openSession();
        Transaction transaction = session.beginTransaction();
        session.save(account);
        transaction.commit();
        session.close();
        return "Saved";
    }
}