在java类中创建了简单的java spring+hibernate应用程序，并带有注解，但当我尝试启动project时，会出现如下错误：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in com.company.configuration.AppConfig: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateTransactionManager' defined in com.company.configuration.AppConfig: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.transaction.PlatformTransactionManager]: Factory method 'hibernateTransactionManager' threw exception; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'hibernateTransactionManager': Requested bean is currently in creation: Is there an unresolvable circular reference?

和

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'hibernateTransactionManager' defined in com.company.configuration.AppConfig: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.transaction.PlatformTransactionManager]: Factory method 'hibernateTransactionManager' threw exception; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'hibernateTransactionManager': Requested bean is currently in creation: Is there an unresolvable circular reference?

我认为app config有问题：

@Configuration
@PropertySource("classpath:appConfig.properties")
@ComponentScan("com.company.department_app")
@Transactional
@EnableTransactionManagement
@EnableWebMvc
public class AppConfig {
    @Autowired
    private Environment environment;

    @Bean
    public DataSource dataSource() {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();

        try {
            dataSource.setDriverClass(environment.getProperty("db.driver"));
            dataSource.setJdbcUrl(environment.getProperty("db.url"));
            dataSource.setUser(environment.getProperty("db.username"));
            dataSource.setPassword(environment.getProperty("db.password"));
        } catch (Exception e) {
            System.out.println("[DB EXCEPTION] : ");
            e.printStackTrace();
            throw new RuntimeException();
        }

        return dataSource;
    }

    @Bean
    public LocalSessionFactoryBean sessionFactory() {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
        sessionFactory.setDataSource(dataSource());
        sessionFactory.setPackagesToScan("com.company.department_app.entity");
        sessionFactory.setHibernateProperties(hibernateProperties());

        return sessionFactory;
    }

    @Bean
    public PlatformTransactionManager hibernateTransactionManager() {
        HibernateTransactionManager transactionManager = new HibernateTransactionManager();
        transactionManager.setSessionFactory(sessionFactory().getObject());

        return transactionManager;
    }

    private Properties hibernateProperties() {
        Properties hibernateProperties = new Properties();
        hibernateProperties.setProperty("hibernate.dialect", environment.getProperty("hibernate.dialect"));
        hibernateProperties.setProperty("hibernate.show_sql", environment.getProperty("hibernate.show_sql"));

        return hibernateProperties;
    }

    @Bean
    public ViewResolver viewResolver() {

        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();

        viewResolver.setPrefix("/WEB-INF/view/");
        viewResolver.setSuffix(".jsp");

        return viewResolver;
    }
}

正如我在stacktrace中看到的，spring正在尝试创建hibernatemanager，而datasourcebean的创建还没有完成。我怎样才能解决这个问题？