问题描述
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APPLICATION FAILED TO START
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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).
问题分析及解决方案
问题原因: Mybatis没有找到合适的加载类,其实是大部分spring - datasource - url没有加载成功,分析原因如下所示.
-
DataSourceAutoConfiguration会自动加载.
-
没有配置spring - datasource - url 属性.
-
spring - datasource - url 配置的地址格式有问题.
-
配置 spring - datasource - url的文件没有加载.
网上给出了这几种解决方案.
方案一 (解决原因1)
排除此类的autoconfig。启动以后就可以正常运行。
@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
方案二 (解决原因2)
在application.properties/或者application.yml文件中没有添加数据库配置信息.
spring:
datasource:
url: jdbc:mysql://localhost:3306/read_data?useUnicode=true&characterEncoding=UTF-8&useSSL=false
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver
方案三(解决原因3)
//正确示例 spring.datasource.url = jdbc:mysql://192.168.0.20:1504/f_me?setUnicode=true&characterEncoding=utf8
方案四 (解决原因4)
yml或者properties文件没有被扫描到,需要在pom文件中<build></build>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>
说明：
小编工作中试过方案四，完全可行
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