Springboot启动报错：Failed to bind properties under spring.datasource to javax.sql.DataSource

左手的ㄟ右手 2022-05-11 04:46 369阅读 0赞

**项目结构：**

![70][]

**`DruidConfig：`**

package com.lucifer.springboot.config;
    
    import com.alibaba.druid.pool.DruidDataSource;
    import com.alibaba.druid.support.http.StatViewServlet;
    import com.alibaba.druid.support.http.WebStatFilter;
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.boot.web.servlet.FilterRegistrationBean;
    import org.springframework.boot.web.servlet.ServletRegistrationBean;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    import javax.sql.DataSource;
    import java.util.Arrays;
    import java.util.HashMap;
    import java.util.Map;
    
    @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","192.168.15.21");
    
            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;
        }
    }

**pom.xml:**

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.lucifer</groupId>
        <artifactId>spring-boot-data-jdbc</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>spring-boot-data-jdbc</name>
        <description>Demo project for Spring Boot</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.5.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-jdbc</artifactId>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
            </dependency>
    
            
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.8</version>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    
    </project>

**`SpringbootMybatisApplication:启动类`**

package com.lucifer.springboot;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class SpringbootMybatisApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(SpringbootMybatisApplication.class, args);
        }
    }

**（ps:如果pom.xml中加了这个<scope>runtime</scope>，application.yml中配置的driver-class-name可能会报红。）**

![70 1][]

![70 2][]

**application.yml:**

spring:
      datasource:
        username: root
        password: 123456
        url: jdbc:mysql://localhost:3306/jdbc
        driver-class-name: com.mysql.jdbc.Driver
        type: com.alibaba.druid.pool.DruidDataSource
    
        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
    #    schema:
    #      - classpath:department.sql

**启动项目，控制台报错：**

![70 3][]

**查看报错信息： Reason: org/apache/log4j/Logger，提示原因在于log4j。**

** 注：  在springboot1.5的版本中，使用的是spring4.x，而springboot2.x使用的是spring5.x，在spring5.x后，官方弃用了log4j，而建议并使用log4j2，因此要么降低版本使用spring4.x的spring boot版本，要么额外去引入log4j的jar包。**

![20200626152759491.png][]

![20200626153106378.png][]

**解决办法:**

**(1)办法一：增加log4j的包**

**（2）办法二：将spring-boot-starter-parent版本2.0.5改成1.5.15，改低一些。**

![70 4][]

**更改后，再次启动，控制台无报错信息。 **

![70 5][]** **

[70]: /images/20220511/95a462dbd99f47fd91c07681ed6aedaf.png
[70 1]: /images/20220511/e50b6daa324846e88689cd77556fde8e.png
[70 2]: /images/20220511/f48b30063a494a8abd55c4a20fd89856.png
[70 3]: /images/20220511/2bf0809d5fbd4a5da8fa001f5b193b6f.png
[20200626152759491.png]: /images/20220511/efd2112f5c1a436796ed6d32175dc04b.png
[20200626153106378.png]: /images/20220511/be44941505644615b2610ab4fee80187.png
[70 4]: /images/20220511/429bc20828b540b99063dc47a3536f59.png
[70 5]: /images/20220511/ee11715eb3304746b6dfa8c0ce36f7df.png