錯誤1：APPLICATION FAILED TO START

本文轉載自查看原文 2020-08-01 21:30 4314 錯誤集

原因：因為之前的項目配置了druid，所以之后的項目創建后運行是@SpringBootApplication會自動裝配autoconfig，他就需要配置數據源也就是druid。

所以有兩種解決方法：

需要在啟動類的@EnableAutoConfiguration或@SpringBootApplication中添加exclude = {DataSourceAutoConfiguration.class}，排除此類的autoconfig。啟動以后就可以正常運行。
在application.xml或application.yml中添加druid的配置數據，如下圖：

 1 spring:
 2   datasource:
 3     username: root
 4     password: root
 5     url: jdbc:mysql://localhost:3306/db_student?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
 6     driver-class-name: com.mysql.cj.jdbc.Driver
 7 
 8     #阿里巴巴的數據庫框架
 9     type: com.alibaba.druid.pool.DruidDataSource
10 
11     #Spring Boot默認是不注入這些屬性值的，需要自己綁定
12     #durid 數據源專有配置
13     initialSize: 5
14     minIdle: 5
15     maxActice: 20
16     maxWait: 60000
17     timeBetweenEvictionRunsMillis: 60000
18     minEvictableIdleTimeMillis: 300000
19     validationQuery: SELECT 1　FROM DUAL
20     testWhileIdle: true
21     testOnBorrow: false
22     testOnReturn: false
23     poolPreparedStatements: true
24 
25     #配置監控統計攔截的filters，stat：監控統計、log4j：日記記錄、wall：防御sql注入
26     #如果允許時報錯  java.lang.ClassNotFoundExceptionn: org.apache.log4j.Priority
27     #則導入 log4j 依賴即可，maven地址：https://mvnrepository.com/artifact/log4j/log4j
28     filters: stat,wall,log4j
29     maxPoolPreparedStatementPerConnectionSize: 20
30     useGlobaDataSourcestat: true
31     connectionProperties: druid.stat.meregeSql=true;druid.stat.slowSqlMillis=500

注意

還有另外一種情況：是這個類里面加了@Configuration這個注解

解決辦法：把注解刪了就好了

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