springboot啟動報錯Failed to configure a DataSource

2018-11-21 19:43:12.076  WARN 5392 --- [           main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: 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
2018-11-21 19:43:12.076  INFO 5392 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
2018-11-21 19:43:12.081  INFO 5392 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2018-11-21 19:43:12.122  INFO 5392 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-11-21 19:43:12.126 ERROR 5392 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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APPLICATION FAILED TO START
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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).

spring boot 會默認加載org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration這個類，而DataSourceAutoConfiguration類使用了@Configuration注解向spring注入了dataSource bean，又因為項目（eureka-server模塊和短信模塊）中並沒有關於dataSource相關的配置信息，所以當spring創建dataSource bean時因缺少相關的信息就會報錯。

解決辦法：

1、在@SpringBootApplication注解上加上exclude，解除自動加載DataSourceAutoConfiguration。
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作者：迷霧騎士
來源：CSDN
原文：https://blog.csdn.net/u010448530/article/details/80840828
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@EnableEurekaServer
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class EurekaServerApplication {

public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class, args);
}
}