SpringBoot 2.0 报错: Failed to configure a DataSource: 'url' attribute is not specified and no embe

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.

1. datasourceautoconfiguration会自动加载.

2. 没有配置spring - datasource - url 属性.

3. spring - datasource - url 配置的地址格式有问题.

4. 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