錯誤日志：
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
問題分析及解決方案
問題原因: Mybatis沒有找到合適的加載類,其實是大部分spring - datasource - url沒有加載成功,分析原因如下所示.
-
DataSourceAutoConfiguration會自動加載.
-
沒有配置spring - datasource - url 屬性.
-
spring - datasource - url 配置的地址格式有問題.
-
配置 spring - datasource - url的文件沒有加載.
- profiles文件夾名稱沖突
方案一 (解決原因1)
排除此類的autoconfig。啟動以后就可以正常運行。
@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
但是這個顯然是治標不治本的，除非你不打算引用mybatis。
方案二 (解決原因2)
在application.properties/或者application.yml文件中沒有添加數據庫配置信息.
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(解決原因3)
spring.datasource.url = jdbc:mysql://192.168.0.20:1504/f_me?setUnicode=true&characterEncoding=utf8
方案四 (解決原因4)
yml或者properties文件沒有被掃描到,需要在pom文件中<build></build>添加如下.來保證文件都能正常被掃描到並且加載成功.
<!-- 如果不添加此節點mybatis的mapper.xml文件都會被漏掉。 -->
<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 (解決原因5)
以上4個我逐一嘗試了，仍然沒能解決問題，於是想到會不會是profiles文件夾名稱問題，將profiles修改成config，問題解決。
如圖：
報錯時：
解決后：
特別感謝以下鏈接地址，以上部分信息直接借鑒的以下地址中的內容：
- Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured
- SpringBoot 2.0 報錯: 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源碼地址
https://github.com/toutouge/javademosecond/tree/master/hellolearn
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