Springboot Failed to parse configuration class [x]; nested exception

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1.前言

在使用Springboot时，我们偶尔会单独引用一些特定的properties文件，在引用这些文件时，我们就应用到了注解：@PropertySource。

2.分析错误信息

Caused by: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [com.zxycloud.common.MybatisGeneratorApplication]; nested exception is java.io.FileNotFoundException: Could not open ServletContext resource [/redisConfig.properties]
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:181)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:315)
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:232)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:275)
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:95)
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:691)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:528)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:316)
	at org.springframework.boot.test.context.SpringBootContextLoader.loadContext(SpringBootContextLoader.java:127)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContextInternal(DefaultCacheAwareContextLoaderDelegate.java:99)
	at org.springframework.test.context.cache.DefaultCacheAwareContextLoaderDelegate.loadContext(DefaultCacheAwareContextLoaderDelegate.java:117)
	... 25 common frames omitted

错误的核心信息是找不到一个properties文件，起初我还以为是maven中的build没有配置好resources，但是检查后发现并不是。仔细看一眼错误，才开始怀疑是否是代码中写错了，果不其然。代码中写配置文件路径的时候没有加上classpath。 正常的使用的代码应该像该类给出的示例那样：

@PropertySource("classpath:/com/myco/a.properties")

当然，如果就在resources下，直接就：

@PropertySource("classpath:a.properties")

3.总结

使用注解时，应该查看一下源代码的注释中是否有详细的解释，显然作者们给出了大量的例子。

转载于:https://my.oschina.net/hengbao666/blog/3005405