springboot整合mybatis导入依赖报错“Problem:unresolved dependency:“com.mysql:mysql-connector-j:jar unknown”

问题原因：idea2019.1选择的springboot版本为3.3.1，默认导入的mysql相关依赖如下：

<dependency>
    <groupId>com.mysql</groupId>
    <artifactId>mysql-connector-j</artifactId>
    <scope>runtime</scope>
</dependency>

解决方案：修改parent版本为2.3.2.RELEASE，然后再修改mysql相关依赖如下：

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>