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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 suitable jdbc url

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).

 

错误原因

在pom中引入了mybatis-spring-boot-starter ，Spring boot默认会加载org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration类，DataSourceAutoConfiguration类使用了@Configuration注解向spring注入了dataSource bean。因为工程中没有关于dataSource相关的配置信息，当spring创建dataSource bean因缺少相关的信息就会报错。

解决错误
第一种方法： 在Spring boot的启动引导类上增加@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})，阻止Spring boot自动注入dataSource

第二种方法：

 添加配置文件 指定 数据库配置源

@Configuration
public class ServerConfiguration {

    @Bean
    @Primary
    @ConfigurationProperties(prefix = "spring.datasource")
    public DataSource dataSource() {
        // 配置数据源（注意，我使用的是 HikariCP 连接池），以上注解是指定数据源，否则会有冲突
        return DataSourceBuilder.create().build();
    }

}

在 application.yml 文件中 写有 数据库连接配置

spring:
  application:
    name: oauth2-server
  datasource:
    type: com.zaxxer.hikari.HikariDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    jdbc-url: jdbc:mysql://localhost:3306/oauth2?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT%2B8
    # url: jdbc:mysql://localhost:3306/oauth2?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT%2B8
    username: root
    password: 123123
    hikari:
      minimum-idle: 5
      idle-timeout: 600000
      maximum-pool-size: 10
      auto-commit: true
      pool-name: MyHikariCP
      max-lifetime: 1800000
      connection-timeout: 30000
      connection-test-query: SELECT 1