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学习教程：
问题1：idea程序包javax.persistence不存在
解决方法 下载ejb3-persistence-1.0.2.GA.jar包 导入https://repository.jboss.org/nexus/content/groups/public/org/hibernate/ejb3-persistence/1.
问题2：Could not create connection to database server
Public Key Retrieval is not allowed
解决方案
spring.datasource.url=jdbc:mysql://localhost:3306/mysql?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai&allowPublicKeyRetrieval=true
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