Error starting ApplicationContext. To display the conditions report re-run your application with ‘de

你遇到的错误，可能是如下所示，提示里面多次提示spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE与spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE，我们很可能会以为是版本冲突问题，我换了很多版本，结果都不是。

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-04-24 12:41:12.026 ERROR 9464 --- [           main] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [ProductApplication]; nested exception is java.lang.IllegalArgumentException: Could not find class [org.springframework.hateoas.client.LinkDiscoverers]
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:189) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:320) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:237) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:280) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:96) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:707) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:533) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:755) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:402) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1247) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1236) ~[spring-boot-2.3.10.RELEASE.jar:2.3.10.RELEASE]
	at ProductApplication.main(ProductApplication.java:11) ~[classes/:na]
Caused by: java.lang.IllegalArgumentException: Could not find class [org.springframework.hateoas.client.LinkDiscoverers]
	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:334) ~[spring-core-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.core.annotation.TypeMappedAnnotation.adapt(TypeMappedAnnotation.java:446) ~[spring-core-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.core.annotation.TypeMappedAnnotation.getValue(TypeMappedAnnotation.java:369) ~[spring-core-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.core.annotation.TypeMappedAnnotation.asMap(TypeMappedAnnotation.java:284) ~[spring-core-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.core.annotation.AbstractMergedAnnotation.asAnnotationAttributes(AbstractMergedAnnotation.java:193) ~[spring-core-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.core.type.AnnotatedTypeMetadata.getAnnotationAttributes(AnnotatedTypeMetadata.java:106) ~[spring-core-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.AnnotationConfigUtils.attributesFor(AnnotationConfigUtils.java:285) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.AnnotationBeanNameGenerator.determineBeanNameFromAnnotation(AnnotationBeanNameGenerator.java:102) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.AnnotationBeanNameGenerator.generateBeanName(AnnotationBeanNameGenerator.java:81) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:280) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.ComponentScanAnnotationParser.parse(ComponentScanAnnotationParser.java:132) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser.doProcessConfigurationClass(ConfigurationClassParser.java:296) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser.processConfigurationClass(ConfigurationClassParser.java:250) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:207) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:175) ~[spring-context-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	... 14 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.hateoas.client.LinkDiscoverers
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581) ~[na:na]
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]
	at java.base/java.lang.Class.forName0(Native Method) ~[na:na]
	at java.base/java.lang.Class.forName(Class.java:398) ~[na:na]
	at org.springframework.util.ClassUtils.forName(ClassUtils.java:284) ~[spring-core-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	at org.springframework.util.ClassUtils.resolveClassName(ClassUtils.java:324) ~[spring-core-5.2.14.RELEASE.jar:5.2.14.RELEASE]
	... 28 common frames omitted

我们可以看见我自己编写的ProductApplication下面有红线错误，这是因为我把ProductApplication类写在java目录下
在这里插入图片描述

原因解析

在

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-04-24 12:41:12.026 ERROR 9464 --- [           main] o.s.boot.SpringApplication               : Application run failed

代码块之前有个警告提示

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

我并没有使用@ComponentScanning注解，这里为什么会蹦出个这样的注解呢？
SpringBoot在编写启动类（Main方法所在的类）的时候如果不使用@ComponentScan指明对象扫描范围，默认指扫描当前启动类所在的包里的对象。
（注意：我在编写Main方法的时候并没有加@ComponentScan注解，因而，他会扫描Application所在的包里的对象）
如果当前启动类没有包，则在启动时会报错：Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package错误。
（注意：写在java文件夹下的Application类，是不从属于任何一个包的，因而启动类没有包）

解决办法

方法一、将Application建在其他的包下面
方法二、在Application类上面加@ComponentScan注解，指定要扫描的包
在这里插入图片描述
问题就解决了