前言

声明：这个错误只是作者在学习时候的一种情况，并不一定能够解决所有情况。还望各位审视出错具体环境！谢谢。
今天使用mybatis逆向工程 springboot本想着少写点代码，但被个bug纠缠到死。bug主要信息为：
Error starting ApplicationContext. To display the conditions report re-run your application with ‘debug’ enabled.
。。。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sqlSessionFactory’ defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]:xxxxxx
。。。

首先有一个其他原因就是版本不一致：mysql的jar包版本和mysql版本要一致。用的jar包不同出来的东西不同也会出错（亲测）
其次逆向每次生成要把上一次剩余的删除干净再生成，我每次剩部分就会报错
我出现这个问题的主要原因是注入失败，失败的原因是mapper.java和mapper.xml不一致，确切的来说是我没配置好使得mapper.xml多了mapper.java没有的内容。思路如下：

首先一点是mybatis逆向工程生成的Mapper.java要加@Mapper注解才行，但是加了注解还是会报类似的错，那么我根据我的节奏剖析原因。

我想使用逆向工程生成一些代码普通最后一项配置是这样的<table tableName="campus" domainObjectName="campus"></table>
但是逆向工程生成example类我不想要。于是就改了一下

<!---->
<table tableName="campus"
domainObjectName="campus"
enableUpdateByExample="false"
enableSelectByExample="false"
enableDeleteByExample="false"
enableCountByExample="false"></table>

本来以为完好，打开mapper.xml发现两者数量根本不匹配，在xml文件中重复了。

然后我再逆向的xml中添加一行selectByExampleQueryId="false"这个怪我当时参数没写全

 <table tableName="campus" domainObjectName="campus" selectByExampleQueryId="false"enableUpdateByExample="false" enableSelectByExample="false" enableDeleteByExample="false" enableCountByExample="false"></table>

启动就没问题了
这个可能只是这种错误的一小部分，可能帮不到很多人！还有其他情况解决欢迎留言补充！
附带maven版本

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.1.3.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com</groupId><artifactId>volunteer</artifactId><version>0.0.1-SNAPSHOT</version><name>volunteer</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-core</artifactId><version>1.3.2</version></dependency><dependency><groupId>org.apache.commons</groupId><artifactId>commons-pool2</artifactId></dependency><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.3.2</version></dependency><!--<dependency>--><!--<groupId>org.springframework.boot</groupId>--><!--<artifactId>spring-boot-starter-data-redis</artifactId>--><!--</dependency>--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.46</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><resources><resource><directory>src/main/resources</directory></resource><resource><directory>src/main/java</directory><includes><include>**/*.xml</include></includes><filtering>true</filtering></resource></resources><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

如果对后端、爬虫、数据结构算法等感性趣欢迎关注我的个人公众号交流：bigsai

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前言

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