1. 启动的Application必须放到一个package下面，如下：
1 package com.example.kikidemo; 2 3 import org.springframework.boot.SpringApplication; 4 import org.springframework.boot.autoconfigure.SpringBootApplication; 5 6 @SpringBootApplication 7 public class KikidemoApplication { 8 9 public static void main(String[] args) { 10 SpringApplication.run(KikidemoApplication.class, args); 11 } 12 }
@SpringBootApplication具有@EnableAutoConfiguration @ComponentScan 等作用
如果Application直接在java目录下，启动时就会提示
** WARNING ** : Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.
随后出现spring-boo-autoconfigure-xxx.jar找不到的奇怪提示，看起来很像是包冲突，具体如下：
1 ** WARNING ** : Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package. 2 3 4 2018-09-05 11:33:59.783 WARN 108 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: URL [jar:file:/E:/Repository/org/springframework/boot/spring-boot-autoconfigure/1.5.10.RELEASE/spring-boot-autoconfigure-1.5.10.RELEASE.jar!/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration$EmbeddedDatabaseConfiguration.class]; nested exception is java.lang.IllegalStateException: Could not evaluate condition on org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$EmbeddedDatabaseConfiguration due to org/springframework/jdbc/datasource/embedded/EmbeddedDatabaseType not found. Make sure your own configuration does not rely on that class. This can also happen if you are @ComponentScanning a springframework package (e.g. if you put a @ComponentScan in the default package by mistake) 5 2018-09-05 11:33:59.786 INFO 108 --- [ main] utoConfigurationReportLoggingInitializer : 6 7 Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled. 8 2018-09-05 11:33:59.792 ERROR 108 --- [ main] o.s.boot.SpringApplication : Application startup failed 9 10 org.springframework.beans.factory.BeanDefinitionStoreException: Failed to read candidate component class: URL [jar:file:/E:/Repository/org/springframework/boot/spring-boot-autoconfigure/1.5.10.RELEASE/spring-boot-autoconfigure-1.5.10.RELEASE.jar!/org/springframework/boot/autoconfigure/jdbc/DataSourceAutoConfiguration$EmbeddedDatabaseConfiguration.class]; nested exception is java.lang.IllegalStateException: Could not evaluate condition on org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$EmbeddedDatabaseConfiguration due to org/springframework/jdbc/datasource/embedded/EmbeddedDatabaseType not found. Make sure your own configuration does not rely on that class. This can also happen if you are @ComponentScanning a springframework package (e.g. if you put a @ComponentScan in the default package by mistake) 11 at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:311) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 12 at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:272) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 13 at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:135) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 14 at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:287) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 15 at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:245) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 16 at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:198) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 17 at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:167) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 18 at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:308) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 19 at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:228) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 20 at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:272) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 21 at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:92) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 22 at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 23 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 24 at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] 25 at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] 26 at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] 27 at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] 28 at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] 29 at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.10.RELEASE.jar:1.5.10.RELEASE] 30 at KikidemoApplication.main(KikidemoApplication.java:8) [classes/:na] 31 Caused by: java.lang.IllegalStateException: Could not evaluate condition on org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$EmbeddedDatabaseConfiguration due to org/springframework/jdbc/datasource/embedded/EmbeddedDatabaseType not found. Make sure your own configuration does not rely on that class. This can also happen if you are @ComponentScanning a springframework package (e.g. if you put a @ComponentScan in the default package by mistake) 32 at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:55) ~[spring-boot-autoconfigure-1.5.10.RELEASE.jar:1.5.10.RELEASE] 33 at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:102) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 34 at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:81) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 35 at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:64) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 36 at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.isConditionMatch(ClassPathScanningCandidateComponentProvider.java:371) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 37 at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.isCandidateComponent(ClassPathScanningCandidateComponentProvider.java:355) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 38 at org.springframework.context.annotation.ClassPathScanningCandidateComponentProvider.findCandidateComponents(ClassPathScanningCandidateComponentProvider.java:288) ~[spring-context-4.3.14.RELEASE.jar:4.3.14.RELEASE] 39 ... 19 common frames omitted 40 Caused by: java.lang.NoClassDefFoundError: org/springframework/jdbc/datasource/embedded/EmbeddedDatabaseType 41 at org.springframework.boot.autoconfigure.jdbc.EmbeddedDatabaseConnection.<clinit>(EmbeddedDatabaseConnection.java:49) ~[spring-boot-autoconfigure-1.5.10.RELEASE.jar:1.5.10.RELEASE] 42 at org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration$EmbeddedDatabaseCondition.getMatchOutcome(DataSourceAutoConfiguration.java:211) ~[spring-boot-autoconfigure-1.5.10.RELEASE.jar:1.5.10.RELEASE] 43 at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:47) ~[spring-boot-autoconfigure-1.5.10.RELEASE.jar:1.5.10.RELEASE] 44 ... 25 common frames omitted 45 Caused by: java.lang.ClassNotFoundException: org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType 46 at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_162] 47 at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_162] 48 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:338) ~[na:1.8.0_162] 49 at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_162] 50 ... 28 common frames omitted 51 52 53 Process finished with exit code 1