spring boot 啟動時報如下錯誤：

Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package
* WARNING ** : Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.


2016-02-26 10:07:01.550  WARN 6112 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt

org.springframework.beans.factory.BeanDefinitionStoreException:
 
 Failed to read candidate component class: URL [jar:file:/C:/Users/cmc/.m2/repository/org/springframework/boot/spring-boot-autoconfigure/1.2.5.RELEASE/spring-boot-autoconfigure-1.2.5.RELEASE.jar!/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration$JdbcTemplateConfiguration.class]; nested exception is java.lang.IllegalStateException: Could not evaluate condition on org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$JdbcTemplateConfiguration due to internal class not found. This can happen if you are @ComponentScanning a springframework package (e.g. if you put a @ComponentScan in the default package by mistake)
 

    at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:303)
    at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:248)
    at org.springframework
 
.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:140)
    at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:266)
    at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:230)
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:197)
    at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:166)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:306)
    at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:239)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:254)
    at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:94)
    ...

原因：application.java 檔案不能直接放在main/java資料夾下，必須要建一個包把他放進去

解決方案：把src/java 路徑下的.java檔案放到建的包下