Spring @Autowired SessionFactory is always null
<p>I just wrote a simple test with spring+hibernate, but I'm getting a null pointer exception in this test as <code>sessionFactory</code> is always null. Then I tried to invoke the method <code>getBean()</code> to get <code>sessionFactory</code>. I found that it works, but <code>@autowired</code> doesn't. Why?</p>

<pre><code>private ApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
protected SessionFactory sessionFactory=(SessionFactory)applicationContext.getBean("sessionFactory");
</code></pre>

<p>Any help is appreciated; thanks.</p>

<p>Below is the content of relevant files:</p>

<p>Here is my <code>applicationContext.xml</code></p>

<pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:cache="http://www.springframework.org/schema/cache" xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans         
  http://www.springframework.org/schema/beans/spring-beans-4.0.xsd        
  http://www.springframework.org/schema/aop         
  http://www.springframework.org/schema/aop/spring-aop-4.0.xsd        
  http://www.springframework.org/schema/context         
  http://www.springframework.org/schema/context/spring-context-4.0.xsd        
  http://www.springframework.org/schema/tx         
  http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
  http://www.springframework.org/schema/cache 
  http://www.springframework.org/schema/cache/spring-cache-4.0.xsd"&gt;
&lt;!-- &lt;bean id="..." class="..."&gt; collaborators and configuration for this 
    bean go here &lt;/bean&gt; &lt;bean id="..." class="..."&gt; collaborators and configuration 
    for this bean go here &lt;/bean&gt; more bean definitions go here --&gt;

&lt;bean id="dataSource"
    class="org.springframework.jdbc.datasource.DriverManagerDataSource"&gt;
    &lt;property name="driverClassName" value="com.mysql.jdbc.Driver" /&gt;
    &lt;property name="url"
        value="jdbc:mysql://localhost:3306/desserthouse?autoReconnect=true" /&gt;
    &lt;property name="username" value="root" /&gt;
    &lt;property name="password" value="1234" /&gt;
&lt;/bean&gt;

&lt;bean id="sessionFactory"
    class="org.springframework.orm.hibernate5.LocalSessionFactoryBean"&gt;
    &lt;property name="dataSource" ref="dataSource" /&gt;
    &lt;property name="packagesToScan" value="edu.nju.dessertHouse.model" /&gt;
    &lt;property name="hibernateProperties"&gt;
        &lt;props&gt;
            &lt;prop key="hibernate.dialect"&gt;org.hibernate.dialect.MySQL5Dialect&lt;/prop&gt;
            &lt;prop key="hibernate.show_sql"&gt;true&lt;/prop&gt;
            &lt;prop key="hibernate.hbm2ddl.auto"&gt;update&lt;/prop&gt;
            &lt;prop key="hibernate.connection.autocommit"&gt;true&lt;/prop&gt;
        &lt;/props&gt;
    &lt;/property&gt;

&lt;/bean&gt;

&lt;bean id="transactionManager"
    class="org.springframework.orm.hibernate5.HibernateTransactionManager"&gt;
    &lt;property name="sessionFactory" ref="sessionFactory" /&gt;
&lt;/bean&gt;

&lt;bean id="autowiredAnnotationBeanPostProcessor"
    class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" /&gt;
&lt;context:component-scan base-package="edu.nju.dessertHouse" /&gt;
&lt;tx:advice id="txAdvice" transaction-manager="transactionManager"&gt;
    &lt;tx:attributes&gt;
        &lt;tx:method name="*User" propagation="REQUIRED" /&gt;
        &lt;tx:method name="*" propagation="NOT_SUPPORTED" read-only="true" /&gt;
    &lt;/tx:attributes&gt;
&lt;/tx:advice&gt;

&lt;aop:config&gt;
    &lt;aop:pointcut id="serviceOperation"
        expression="execution( * edu.nju.dessertHouse.service..*Service.*(..))" /&gt;
    &lt;aop:advisor advice-ref="txAdvice" pointcut-ref="serviceOperation" /&gt;
&lt;/aop:config&gt;
</code></pre>

<p></p>

<p>Here is my test <code>MemberDaoImpl</code>:</p>

<pre><code>@Repository
public class MemberDaoImpl implements MemberDao {

@Autowired
protected SessionFactory sessionFactory;

protected Session session;


protected static MemberDaoImpl memberDao=new MemberDaoImpl();

public Session getSession(){
    return sessionFactory.openSession();
}

@Override
public void resigter(Member member) {
    try {  
        session=getSession();
        Transaction tx=session.beginTransaction();
        session.save(member);
        tx.commit();
        session.close();
        sessionFactory.close();
        System.out.println("ok");
    }  
    catch (Exception e) {  
        e.printStackTrace();
    }   
}

public static void main(String[] args){
    Member member=new Member();
    member.setMemberid(1);
    member.setCreditCard("1");
    member.setMemberCard("1");
    member.setLocation("1");
    member.setMname("1");
    member.setPassword("1");
    member.setSex("1");
    member.setPoint(1);
    Calendar calendar=Calendar.getInstance();
    calendar.set(Calendar.YEAR,1995);
    calendar.set(Calendar.MONTH,7-1);  
    calendar.set(Calendar.DAY_OF_MONTH,6);
    Date date=new Date(calendar.getTimeInMillis());
    member.setBirthday(date);
    memberDao.resigter(member);

}
</code></pre>

<p>}</p>

<p>Why is <code>sessionFactory</code> null? I have tried many methods, but it still doesn't work.</p>