应该是你的配置没有加载到,异常可以参考 https://blog.csdn.net/guangcaiwudong/article/details/100772134
当读不到数据库配置信息时就会报Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
这个地方你检查一下,是不是要加一个src/main/resources的配置
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>