Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

错误日志：

2019-07-13 16:04:26.318  INFO 21144 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2019-07-13 16:04:26.325  WARN 21144 --- [           main] o.a.c.loader.WebappClassLoaderBase       : The web application [ROOT] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.lang.Object.wait(Native Method)
 java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:143)
 com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:43)
2019-07-13 16:04:26.333  INFO 21144 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-07-13 16:04:26.339 ERROR 21144 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
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).

Disconnected from the target VM, address: '127.0.0.1:7870', transport: 'socket'

Process finished with exit code 1

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.

5. profiles文件夹名称冲突

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})

但是这个显然是治标不治本的，除非你不打算引用mybatis。

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)

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>

方案五 (解决原因5)

以上4个我逐一尝试了，仍然没能解决问题，于是想到会不会是profiles文件夹名称问题，将profiles修改成config，问题解决。

如图：

报错时：

解决后：

特别感谢以下链接地址，以上部分信息直接借鉴的以下地址中的内容：

• Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured
• SpringBoot 2.0 报错: Failed to configure a DataSource: 'url' attribute is not specified and no embe...
• Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured. SPRING
• Resolving “Failed to Configure a DataSource” Error

v源码地址

https://github.com/toutouge/javademosecond/tree/master/hellolearn

作　　者：请叫我头头哥
出　　处：http://www.cnblogs.com/toutou/
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