SpringBoot2.x填坑（三）：启动报错Failed to configure a DataSource: 'url' attribute is not specified and no emb

拼搏现实的明天。 2022-03-09 14:48 151阅读 0赞

#### 错误日志 ####

***************************
    APPLICATION FAILED TO START
    ***************************
    
    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).
    
    
    Process finished with exit code 1

#### 分析原因 ####

根据报错日志分析是在springboot项目启动的时候没有找到database 数据库连接地址，我们知道在spring boot 启动的时候会默认加载org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration这个类，而DataSourceAutoConfiguration类使用了@Configuration注解向spring注入了dataSource bean，又因为项目中并没有关于dataSource相关的配置信息，所以当spring创建dataSource bean时因缺少相关的信息就会报错。

#### 问题排查 ####

1.  检查pom.xml 项目数据库jar 是否引用；
2.  查看\*\*.properties或\*\*.yml 配置文件是否配置数据库链接池；
3.  查看spring - datasource - url 配置的地址格式错误需要转义等；
4.  yml或者properties文件可能没有被扫描到（情况比较少，如果按照标准命名都会被默认扫描）；

#### 解决方案 ####

###### 方案1、如果项目不需要数据库相关信息就排除此类的autoconfig ######

在@SpringBootApplication注解上加上exclude，解除自动加载DataSourceAutoConfiguration。

@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})

springboot启动类加上这个启动以后就可以正常运行。完整代码：

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
    public class Application {
    	public static void main(String[] args) {
    		SpringApplication.run(Application, args);
    	}
    }

###### 方案2、配置文件添加数据库链接信息 ######

\*\*. properties 文件添加数据库配置信息（以mysql为例）：

druid.driver=com.mysql.jdbc.Driver
    druid.url=jdbc:mysql://localhost:3306/data?serverTimezone=Asia/Shanghai&allowMultiQueries=true
    druid.username= root
    druid.password= root

\*\*.yml文件添加数据库配置信息（已mysql为例）：

spring:
      datasource:
        url: jdbc:mysql://localhost:3306/data?serverTimezone=Asia/Shanghai&allowMultiQueries=true
        username: root
        password: root
        driver-class-name: com.mysql.jdbc.Driver

###### 方案3、配置信息转义 ######

//错误示例

druid.url= jdbc:mysql\://localhost\: 3306/data?serverTimezone=Asia/Shanghai&allowMultiQueries=true

//正确示例

druid.url= jdbc:mysql://localhost: 3306/data?serverTimezone=Asia/Shanghai&allowMultiQueries=true

###### 方案4、配置pom.xml 中yml或者properties扫描 ######

需要在pom文件中</build中添加如下.来保证文件都能正常被扫描到并且加载成功.

<resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.yml</include>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.yml</include>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>

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SpringBoot2.x填坑（三）：启动报错Failed to configure a DataSource: 'url' attribute is not specified and no emb

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