記錄此次失敗的錯誤，一警告自己以后做事情一定要仔細(xì)，通讀全篇再開工?。。?！

//啟動時注入全局參數(shù)
@Configuration
//指定服務(wù)包
//@ComponentScan(basePackages = {"com.yt.design"})
@EnableJpaRepositories(basePackages = "com.yt.design.jpa.repository")
@EntityScan(basePackages = {"com.yt.design.jpa.entity"})
//指定啟動事務(wù)管理
@EnableTransactionManagement
public class JPAConfig {
      。。。。。。
}

 @Bean(name = "entityManagerFactory")
    public LocalContainerEntityManagerFactoryBean entityManagerFactory
            (DataSource dataSource) {
        LocalContainerEntityManagerFactoryBean em = new
                LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource);
//        TODO；2018年04月12日20:22:57教訓(xùn)仔細(xì)啊
        em.setPackagesToScan("com.yt.design.jpa.entity");

        JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter(vendorAdapter);
        em.setJpaProperties(additionalProperties());

        return em;
    }