Maven多模块报错: If you want an embedded database (H2, HSQL or Derby)

情景

一个Maven单模块项目改造为多模块项目后，发现报错：

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APPLICATION FAILED TO START  
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Description:  
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Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.  
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Reason: Failed to determine a suitable driver class  
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Action:  
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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).  
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Process finished with exit code 1

一种可行的解决方案

如果是Maven多模块项目，查看IDEA右上角Edit Configurations -> Use classpath of module，此栏应为 包含程序入口的xxxApplication.java和application.yml的module：

如上图，博主的程序入口xxxApplication.java和application.yml放置于server这个module，brother-takeaway-order是之前单体模块的名称。把此处的module切换为server，即可解决报错。