‘url‘ attribute is not specified and no embedded datasource could be configured.

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

搭建全新架构的时候，引入包就会引发这个问题，因为这个时候没有配置数据库呢，但是默认是需要的

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 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.5.RELEASE)

2023-11-03 02:30:34.087  INFO 20144 --- [           main] further.MainApp                          : Starting MainApp on thinkpad-t440p-zwf with PID 20144 (D:\eclipse-jee-oxygen-2-win32-x86_64\workspace\test\target\classes started by Administrator in D:\eclipse-jee-oxygen-2-win32-x86_64\workspace\test)
2023-11-03 02:30:34.090  INFO 20144 --- [           main] further.MainApp                          : The following profiles are active: dev
2023-11-03 02:30:34.643  INFO 20144 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2023-11-03 02:30:34.661  INFO 20144 --- [           main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 8ms. Found 0 repository interfaces.
2023-11-03 02:30:35.323  INFO 20144 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$1d286883] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-03 02:30:36.118  INFO 20144 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8072 (http)
2023-11-03 02:30:36.150  INFO 20144 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-11-03 02:30:36.151  INFO 20144 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.19]
2023-11-03 02:30:36.308  INFO 20144 --- [           main] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-11-03 02:30:36.309  INFO 20144 --- [           main] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2163 ms
2023-11-03 02:30:36.381  WARN 20144 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaConfiguration': 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
2023-11-03 02:30:36.385  INFO 20144 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2023-11-03 02:30:36.397  INFO 20144 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2023-11-03 02:30:36.400 ERROR 20144 --- [           main] 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).

先把这些没用的先移除

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