SpringBoot没有读取到application.yml

1.遇到的问题

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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).

其实我的application.yml文件配置的一点问题都没有，依赖也依赖够了，可是还是报这个错。

2.发现问题

由于application.xml实在controller模块下的，
结果发现pom.xml的配置里面有一条配置是这样的

<packaging>pom</packaging>

由于这里配置错了pom导致我读取不到resources的配置文件，所以才会报错。

3.改正

<packaging>war</packaging>

然后重新刷新maven，运行项目