Failed to bind properties under 'spring.datasource

springboot整合druid时，引入了druid的数据源，在配置文件application.yml中配置了相关配置

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

也作了相关配置 DruidConfig.class

@Configuration
public class DruidConfig {
 
	@ConfigurationProperties(prefix = "spring.datasource")
	@Bean
	public DataSource druid() {
		return new DruidDataSource();
	}
 
	// 配置Druid的监控
	// 1、配置一个管理后台的Servlet
	@Bean
	public ServletRegistrationBean statViewServlet() {
		ServletRegistrationBean bean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
		Map<String, String> initParams = new HashMap<>();
 
		initParams.put("loginUsername", "admin");
		initParams.put("loginPassword", "123456");
		initParams.put("allow", "");// 默认就是允许所有访问
		initParams.put("deny", "10.18.172.124");
 
		bean.setInitParameters(initParams);
		return bean;
	}
 
	// 2、配置一个web监控的filter
	@Bean
	public FilterRegistrationBean webStatFilter() {
		FilterRegistrationBean bean = new FilterRegistrationBean();
		bean.setFilter(new WebStatFilter());
 
		Map<String, String> initParams = new HashMap<>();
		initParams.put("exclusions", "*.js,*.css,/druid/*");
 
		bean.setInitParameters(initParams);
 
		bean.setUrlPatterns(Arrays.asList("/*"));
 
		return bean;
	}
}

但是在启动时报错：

---

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]:24:14     Reason: org.apache.log4j.Logger

Action:

Update your application's configuration

 

根据报错提示在配置文件的24行，查看配置文件，该行代码是     filters: stat,wall,log4j

看报错原因Reason: org.apache.log4j.Logger，于是猜想少了log4j的相关依赖，在pom中引入相关依赖

<!-- https://mvnrepository.com/artifact/log4j/log4j -->
		<dependency>
		    <groupId>log4j</groupId>
		    <artifactId>log4j</artifactId>
		    <version>1.2.17</version>
		</dependency>

再次启动，成功！