Failed to bind properties under 'spring.datasource' to javax.sql.DataSource

 绑定配置配置的yml文件

@Configuration
public class DruidConfig {

    // @ConfigurationProperties:用于参数绑定,需要指定文件
    @ConfigurationProperties(prefix = "spring.datasource")
    // 将我们创建的数据源加在容器中
    @Bean
    public DataSource druid(){
        return new DruidDataSource();
    }
}

 yml配置文件

spring:
  datasource:
    username: root
    password: 123456
    # useUnicode=true&characterEncoding=UTF-8: 解决中文乱码问题
    # serverTimezone=UTC: 其中UTC是统一标准世界时间
    url: jdbc:mysql://localhost:3306/jdbc?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC
    # com.mysql.jdbc.Driver: 老的版本的这个,被替换掉了
    # SpringBoot2.0之后默认的数据源是: com.zaxxer.hikari.HikariDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    # 在SpringBoot2.0以上版本需要添加这条命令,表示:Always initialize the datasource
    initialization-mode: always
    # 使用type更换数据源DruidDataSource
    type: com.alibaba.druid.pool.DruidDataSource
# 数据源其他配置
    # 数据库连接池初始化的大小
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

 之后运行主程序报如下错误

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to bind properties under 'spring.datasource' to javax.sql.DataSource:

    Property: spring.datasource.filters
    Value: stat,wall,log4j
    Origin: class path resource [application.yml]:29:14
    Reason: org.apache.log4j.Logger

Action:

Update your application's configuration

里边有一行：Reason: org.apache.log4j.Logger 因此我试着在pom文件中添加了log4j依赖

<!-- 引入log4j -->
<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.17</version>
</dependency>

重新运行无报错！