SpringBoot——報錯總結

前言

記錄SpringBoot的相關報錯信息

錯誤

沒法引入@ResponseBody和@RequestMapping("/")

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

Failed to configure a DataSource: 'url'

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
source : http://www.javashuo.com/article/p-cncvuqvs-bw.html

緣由

1. DataSourceAutoConfiguration會自動加載.

2. 沒有配置spring - datasource - url 屬性.

3. spring - datasource - url 配置的地址格式有問題.

4. 配置 spring - datasource - url的文件沒有加載.

解決

方案一 (解決緣由1)[本人就是這種狀況]
排除此類的autoconfig。啓動之後就能夠正常運行。

@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
方案二 (解決緣由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 (解決緣由3)
在spring xml配置文件中引用了數據庫地址 因此須要對:等進行轉義處理.可是在application.properties/或者application.yml文件並不須要轉義,錯誤和正確方法寫在下面了.

//錯誤示例
spring.datasource.url = jdbc:mysql\://192.168.0.20\:1504/f_me?setUnicode=true&characterEncoding=utf8
//正確示例
spring.datasource.url = jdbc:mysql://192.168.0.20:1504/f_me?setUnicode=true&characterEncoding=utf8
方案四 (解決緣由4)
yml或者properties文件沒有被掃描到,須要在pom文件中<build></build>添加以下.來保證文件都能正常被掃描到而且加載成功.

<!-- 若是不添加此節點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>