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
- 检查pom.xml 项目数据库jar 是否引用;
- 查看.properties或.yml 配置文件是否配置数据库链接池;
- 查看spring - datasource - url 配置的地址格式错误需要转义等;
- 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></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.
<!-- 如果不添加此节点mybatis的mapper.xml文件都会被漏掉。 -->
<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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