Failed to configure a DataSource: ‘url‘ attribute

一 完整的错误信息

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APPLICATION FAILED TO START
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Description:
 
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
 
Reason: Failed to determine a suitable driver class
 
 
Action:
 
Consider the following:
    If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
    If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

二 思考过程

       1. 配置文件，发现配置文件存在，排除。

       2. 配置信息，发现存在一个空格，将配置文件的多余空格删除，无效，排除。

        3. 明明存在配置文件，在保证配置信息完整的前提下，不起作用，网上又说使用@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})，但是系统确实需要数据库操作，所以不采纳。

        4. POM配置，最后真的发现问题了，因为POM文件中增加了配置信息

<excludes><exclude>*.yml</exclude><exclude>*.xml</exclude><exclude>**/template/</exclude>
</excludes>

        换成下面配置信息即可。

<includes><include>**/*.xml</include><include>**/*.yml</include>
</includes>
<filtering>true</filtering>