关于idea中SpringBoot启动失败的坑
很多时候你新建了Maven 或者SpringBoot ⼯程，激动的点了主启动类，你就发现了下⾯的错误
Error starting Tomcat context. Exception: org.springframework.beans.factory.BeanCreationException. Message:
Error creating bean with name 'servletEndpointRegistrar' defined in class path resource
[org/springframework/boot/actuate/autoconfigure/endpoint/web/ServletEndpointManagementContextConfiguration$ WebMvcServletEndpointManagementContextConfiguration.class]:
Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException:
Failed to instantiate [org.springframework.dpoint.web.ServletEndpointRegistrar]:
Factory method 'servletEndpointRegistrar' threw exception;
nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'healthEndpoint' defined in class path resource
[org/springframework/boot/actuate/autoconfigure/health/HealthEndpointConfiguration.class]:
Unsatisfied dependency expressed through method 'healthEndpoint' parameter 0;
nested exception is org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'healthContributorRegistry' defined in class path resource
[org/springframework/boot/actuate/autoconfigure/health/HealthEndpointConfiguration.class]:
Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException:
Failed to instantiate [org.springframework.boot.actuate.health.HealthContributorRegistry]:
Factory method 'healthContributorRegistry' threw exception;
nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException:
Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.jdbc.DataSourceHealthContributorAutoConfiguration':
Unsatisfied dependency expressed through constructor parameter 0;
nested exception is org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]:
Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException:
Failed to determine a suitable driver class
[  restartedMain] o.StandardService  : Stopping service [Tomcat]
-
-- [  restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt:
t.ApplicationContextException: Unable to start web server; nested exception is org.springframework.boot.web.server.WebServerException:
Unable to start embedded Tomcat
--- [  restartedMain] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-09-03 13:12:04.338 ERROR 24572 --- [  restartedMain] o.s.b.d.LoggingFailureAnalysisReporter  :
***************************
APPLICATION FAILED TO START
***************************
Description:
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class
Action:
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).
  这⾥说的是啥意思呢，你没有数据库相关的链接，数据库相关的链接在哪⾥配置呢，就是在你的Resource⽂件⽬录下的properties 或者yml⽂件中
但是这⾥你可能会说，我**不⽤数据库，我⼲啥配这个b玩意，我想说这句话的时候，你已经点了很多遍的主启动都报这个错误，
今天你算来对了，我敢肯定80%的⼈都遇到过这个问题。但是不知道为啥，今天我给你分析⼀下昂：
①：在IDEA 中⽤SpringInitial  点点点⽣成的SpringBoot/cloud项⽬
②：跟视频操作，⼀顿操作后发现不能启动，
③：DonwLoad下的代码复制进去的POM依赖
还有很多昂，不墨迹了说重点吧。
解决⽅法：
⾸先着重看⾃⼰的POM依赖（是⾃⼰的POM，不是⽗⼯程，也不是其他⼯程，是⾃⼰的）中有⽆以下依赖
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
idea debug
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
  经过鄙⼈的测试，就是第⼀个依赖捣的⿁，这就是为啥你加了这个依赖你不配置相关的mysql链接，Spring就给你报错的原因。最后提醒：按需注⼊POM才是正道，⽼铁们，我做的对么？

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