Hibernate AnnotationSessionFactoryBean 获取sessionFactory问题

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Hibernate AnnotationSessionFactoryBean 获取sessionFactory问题0

下面的代码中，getSessionFactory方法中a.getObject()返回的值为null.请问是应该怎么解决啊？？？


@SuppressWarnings("unchecked") 
@Configuration
@Component
public class AppConfig implements ServletConfigAware,ServletContextAware{

	//hibernate(读取配置文件中的值) 
	private @Value("${hibernate.dialect}") String dialect; 
	private @Value("${hibernate.show_sql}") String showSql;
	private @Value("${hibernate.hbm2ddl.auto}") String hbm2ddl;
	private @Value("${hibernate.default_schema}") String default_schema;
	private @Value("${hibernate.max_fetch_depth}") String max_fetch_depth;
	private @Value("${hibernate.query.factory_class}")String query_factory_class;
	//jdbc
	private @Value("${jdbc.driverClass}") String driverClass;
	private @Value("${jdbc.url}") String jdbcUrl;
	private @Value("${jdbc.user}") String user;
	private @Value("${jdbc.password}") String password;

	//c3p0
	private @Value("${c3p0.minPoolSize}") int minPoolSize;
	private @Value("${c3p0.maxPoolSize}") int maxPoolSize;
	private @Value("${c3p0.initialPoolSize}") int initialPoolSize;
	private @Value("${c3p0.maxIdleTime}") int maxIdleTime;
	private @Value("${c3p0.maxStatements}") int maxStatements;
	private @Value("${c3p0.acquireIncrement}") int acquireIncrement;
	private @Value("${c3p0.idleConnectionTestPeriod}") int idleConnectionTestPeriod;
	private @Value("${c3p0.acquireRetryAttempts}") int acquireRetryAttempts;
	private @Value("${c3p0.breakAfterAcquireFailure}") boolean breakAfterAcquireFailure;
	
	//mail
	private @Value("${mail.host}") String host;
	private @Value("${mail.username}") String username;
	private @Value("${mail.password}") String mailpwd;
	private @Value("${mail.smtp.auth}") String smtpAuth;
	private @Value("${mail.smtp.timeout}") String smtpTimeout;
	
	private @Value("${system.hibernate.models}") String models;     //hibernate扫描的包
	
	private ApplicationContext applicationContext;
	 

	public ApplicationContext getApplicationContext() {
		return applicationContext;
	}

	public void setApplicationContext(ApplicationContext applicationContext) {
		this.applicationContext = applicationContext;
	}

	//数据源
	@Bean(name="dataSource")
	public DataSource getDataSource(){
		ComboPooledDataSource cpds = new ComboPooledDataSource(); 
		cpds.setJdbcUrl(jdbcUrl);
		try {
			cpds.setDriverClass(driverClass);
		} catch (PropertyVetoException e) {
			e.printStackTrace();
		}
		cpds.setUser(user);
		cpds.setPassword(password);
		
		//连接池中保留的最小连接数
		cpds.setMinPoolSize(minPoolSize);
		//连接池中保留的最大连接数。Default: 15
		cpds.setMaxPoolSize(maxPoolSize);
		//初始化时获取的连接数，取值应在minPoolSize与maxPoolSize之间。Default: 3
		cpds.setInitialPoolSize(initialPoolSize);
		//最大空闲时间,60秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0
		cpds.setMaxIdleTime(maxIdleTime);
		//当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3
		cpds.setAcquireIncrement(acquireIncrement);
		//每60秒检查所有连接池中的空闲连接。Default: 0
		cpds.setIdleConnectionTestPeriod(idleConnectionTestPeriod);
		//定义在从数据库获取新连接失败后重复尝试的次数。Default: 30
		cpds.setAcquireRetryAttempts(acquireRetryAttempts);
		//获取连接失败将会引起所有等待连接池来获取连接的线程抛出异常。但是数据源仍有效保留，并在下次调用getConnection()的时候继续尝试获取连接。如果设为true，那么在尝试获取连接失败后该数据源将申明已断开并永久关闭。Default: false-->
		cpds.setBreakAfterAcquireFailure(breakAfterAcquireFailure);
		cpds.setMaxStatements(maxStatements);
		
		return cpds;
	}
	
	//Hibernate - SessionFactory
	@Bean(name="sessionFactory")
	@DependsOn("dataSource")
	public SessionFactory getSessionFactory() throws Exception { 
		Properties properties = new Properties();
		properties.put("hibernate.dialect", dialect);
		/**
		properties.put("hibernate.show_sql", showSql);
		properties.put("hibernate.hbm2ddl.auto", hbm2ddl);
		properties.put("hibernate.max_fetch_depth", max_fetch_depth);
		properties.put("hibernate.temp.use_jdbc_metadata_defaults", "false");  
		properties.put("hibernate.jdbc.fetch_size", "50");
		properties.put("hibernate.jdbc.batch_size", "25"); */
		 
		AnnotationSessionFactoryBean a = new AnnotationSessionFactoryBean(); 
		a.setDataSource(this.getDataSource());
		a.setHibernateProperties(properties);  
		a.setPackagesToScan(models.split(","));
		
		SessionFactory sessionFactory = a.getObject();
		System.out.println("dataSource = "+this.getDataSource());
		System.out.println("sessionFactory = "+sessionFactory);
		return sessionFactory;
		
	}
	 
	public void setServletConfig(ServletConfig config) {
		 
	}

	@Override
	public void setServletContext(ServletContext arg0) {
		 
	}

}

spring hibernate