spring boot结合hibernate使用中的一些问题

org.hibernate.MappingException: composite-id class must implement Serializable
如果指定了多个@Id，这个类必须implement Serializable


org.xml.sax.SAXException: null:11: Element <defaultCache> does not allow attribute "maxEntriesLocalHeap".
因为ehcache版本过低，需要在maven中单独引入,不能用hibernate默认的版本


org.hibernate.HibernateException: Could not obtain transaction-synchronized Session for current thread
参考https://stackoverflow.com/questions/26203446/spring-hibernate-could-not-obtain-transaction-synchronized-session-for-current
必须要指定@EnableTransactionManagement