Java 刚开始学习 springboot+mybatis 查询用户时运行时一直报错，在网上一直找不到原因，求解决
github 仓库代码地址：https://github.com/gglss/SpringbootMybatis
附上代码
<?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>
<groupId>com.springmybatis.serve</groupId>
<artifactId>SpringbootMybatis</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<java.version>1.8</java.version>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.6</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.5.6</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.3</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.76</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
<version>2.3.0.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
</dependencies>
</project>
application.yaml
server:
port: 8082
logging:
file:
path: D:\me\code\trading_system_interface\InterfaceOptimize\src\main\java\com\course\logs
name: mylog.log
spring:
application:
name: myTest
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://8.142.144.75:3306/course?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true
username: root
password: william
mybatis:
type-aliases-package: com.course.entity
mapper-locations:
- mybatis/mapper/*
mybatis-config.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
<package name="com.course.model"/>
</typeAliases>
<mappers>
<mapper resource="mybatis/mapper/mysql.xml"/>
</mappers>
</configuration>
mysql.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.course.Dao.UserDao">
<!--查询统计人员数-->
<select id="getUserCount" resultType="Integer">
select * frme user;
</select>
</mapper>
user 实体类
package com.course.entity;
import lombok.Data;
/**
* @ClassName user
* @Description user表实体类
* @Author @0_0
* @Date 2022/10/28 17:12
* @Version 1.0
*/
@Data
public class user {
private Integer id;
private String name;
private String age;
}
userMapper 接口
package com.course.mapper;
import com.course.entity.user;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
/**
* @InterfaceName userMapper
* @Description TODO
* @Author @0_0
* @Date 2022/10/28 17:18
* @Version 1.0
*/
@Mapper
public interface userMapper {
// 查询所有user信息
List<user> selectUserMapper();
}
UserController 类
package com.course.controller;
import com.course.entity.user;
import com.course.mapper.userMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
/**
* @ClassName Demo
* @Description TODO
* @Author @0_0
* @Date 2022/10/25 17:50
* @Version 1.0
*/
@RestController
@RequestMapping("v1")
public class UserController {
// 首先获取一个执行sql语句的对象
// @Autowired 启动器加载
@Autowired
// private SqlSessionTemplate template;
private userMapper userMapper;
/**
* 获取到用户数
* @return 用户数量
*/
@RequestMapping(value = "/getUser", method = RequestMethod.GET)
public List<user> getUser(){
List<user> userEntities = userMapper.selectUserMapper();
for (user user:userEntities){
System.out.println(user);
}
return userEntities;
}
}
Application 启动类
package com.course;
import lombok.extern.slf4j.Slf4j;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.scheduling.annotation.EnableScheduling;
import javax.annotation.PreDestroy;
/**
* @ClassName Application
* @Description TODO
* @Author @0_0
* @Date 2022/10/25 17:54
* @Version 1.0
*/
@Slf4j
//@EnableScheduling
@MapperScan("com.course.mapper")
@SpringBootApplication
public class Application {
private static ConfigurableApplicationContext context;
public static void main(String[] args) {
Application.context = SpringApplication.run(Application.class, args);
log.info("项目启动成功");
}
@PreDestroy
public void close(){
Application.context.close();
}
}
运行 Application 启动类提示
"C:\Program Files\Java\jdk1.8.0_151\bin\java.exe" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always "-javaagent:D:\JavaIDE\IntelliJ IDEA 2021.1.3\lib\idea_rt.jar=51824:D:\JavaIDE\IntelliJ IDEA 2021.1.3\bin" -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_151\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_151\jre\lib\rt.jar;C:\Users\Administrator\Desktop\code\SpringbootMybatis\target\classes;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.5.6\spring-boot-starter-web-2.5.6.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter\2.5.6\spring-boot-starter-2.5.6.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot\2.5.6\spring-boot-2.5.6.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.5.6\spring-boot-autoconfigure-2.5.6.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.5.6\spring-boot-starter-logging-2.5.6.jar;C:\Users\Administrator\.m2\repository\ch\qos\logback\logback-classic\1.2.6\logback-classic-1.2.6.jar;C:\Users\Administrator\.m2\repository\ch\qos\logback\logback-core\1.2.6\logback-core-1.2.6.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.14.1\log4j-to-slf4j-2.14.1.jar;C:\Users\Administrator\.m2\repository\org\apache\logging\log4j\log4j-api\2.14.1\log4j-api-2.14.1.jar;C:\Users\Administrator\.m2\repository\org\slf4j\jul-to-slf4j\1.7.32\jul-to-slf4j-1.7.32.jar;C:\Users\Administrator\.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-core\5.3.12\spring-core-5.3.12.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-jcl\5.3.12\spring-jcl-5.3.12.jar;C:\Users\Administrator\.m2\repository\org\yaml\snakeyaml\1.28\snakeyaml-1.28.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.5.6\spring-boot-starter-json-2.5.6.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.12.5\jackson-databind-2.12.5.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.12.5\jackson-annotations-2.12.5.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.12.5\jackson-core-2.12.5.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.12.5\jackson-datatype-jdk8-2.12.5.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.12.5\jackson-datatype-jsr310-2.12.5.jar;C:\Users\Administrator\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.12.5\jackson-module-parameter-names-2.12.5.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.5.6\spring-boot-starter-tomcat-2.5.6.jar;C:\Users\Administrator\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.54\tomcat-embed-core-9.0.54.jar;C:\Users\Administrator\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.54\tomcat-embed-el-9.0.54.jar;C:\Users\Administrator\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.54\tomcat-embed-websocket-9.0.54.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-web\5.3.12\spring-web-5.3.12.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-beans\5.3.12\spring-beans-5.3.12.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-webmvc\5.3.12\spring-webmvc-5.3.12.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-aop\5.3.12\spring-aop-5.3.12.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-context\5.3.12\spring-context-5.3.12.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-expression\5.3.12\spring-expression-5.3.12.jar;C:\Users\Administrator\.m2\repository\org\mybatis\spring\boot\mybatis-spring-boot-starter\2.1.3\mybatis-spring-boot-starter-2.1.3.jar;C:\Users\Administrator\.m2\repository\org\mybatis\spring\boot\mybatis-spring-boot-autoconfigure\2.1.3\mybatis-spring-boot-autoconfigure-2.1.3.jar;C:\Users\Administrator\.m2\repository\org\mybatis\mybatis\3.5.5\mybatis-3.5.5.jar;C:\Users\Administrator\.m2\repository\org\mybatis\mybatis-spring\2.0.5\mybatis-spring-2.0.5.jar;C:\Users\Administrator\.m2\repository\org\projectlombok\lombok\1.18.20\lombok-1.18.20.jar;C:\Users\Administrator\.m2\repository\com\alibaba\fastjson\1.2.76\fastjson-1.2.76.jar;C:\Users\Administrator\.m2\repository\org\springframework\boot\spring-boot-starter-jdbc\2.3.0.RELEASE\spring-boot-starter-jdbc-2.3.0.RELEASE.jar;C:\Users\Administrator\.m2\repository\com\zaxxer\HikariCP\3.4.5\HikariCP-3.4.5.jar;C:\Users\Administrator\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-jdbc\5.2.6.RELEASE\spring-jdbc-5.2.6.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-tx\5.2.6.RELEASE\spring-tx-5.2.6.RELEASE.jar;C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\5.1.6\mysql-connector-java-5.1.6.jar" com.course.Application
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.5.6)
2022-10-28 23:11:46.452 INFO 4372 --- [ main] com.course.Application : Starting Application using Java 1.8.0_151 on USER-20181130AE with PID 4372 (C:\Users\Administrator\Desktop\code\SpringbootMybatis\target\classes started by Administrator in C:\Users\Administrator\Desktop\code\SpringbootMybatis)
2022-10-28 23:11:46.457 INFO 4372 --- [ main] com.course.Application : No active profile set, falling back to default profiles: default
2022-10-28 23:11:52.355 INFO 4372 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8082 (http)
2022-10-28 23:11:52.548 INFO 4372 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-10-28 23:11:52.550 INFO 4372 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.54]
2022-10-28 23:11:53.073 INFO 4372 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-10-28 23:11:53.074 INFO 4372 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 6491 ms
2022-10-28 23:11:56.346 WARN 4372 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceTransactionManagerAutoConfiguration$JdbcTransactionManagerConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.jdbc.datasource.DataSourceTransactionManager]: Factory method 'transactionManager' threw exception; nested exception is java.lang.NoClassDefFoundError: org/springframework/jdbc/support/JdbcTransactionManager
2022-10-28 23:11:56.352 WARN 4372 --- [ main] .s.c.a.CommonAnnotationBeanPostProcessor : Destroy method on bean with name 'application' threw an exception: java.lang.NullPointerException
2022-10-28 23:11:56.362 INFO 4372 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2022-10-28 23:11:56.384 INFO 4372 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-10-28 23:11:56.631 ERROR 4372 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'transactionManager' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceTransactionManagerAutoConfiguration$JdbcTransactionManagerConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.jdbc.datasource.DataSourceTransactionManager]: Factory method 'transactionManager' threw exception; nested exception is java.lang.NoClassDefFoundError: org/springframework/jdbc/support/JdbcTransactionManager
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:658) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:638) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1195) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:582) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:542) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:335) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.12.jar:5.3.12]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.12.jar:5.3.12]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:145) ~[spring-boot-2.5.6.jar:2.5.6]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) [spring-boot-2.5.6.jar:2.5.6]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:434) [spring-boot-2.5.6.jar:2.5.6]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:338) [spring-boot-2.5.6.jar:2.5.6]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) [spring-boot-2.5.6.jar:2.5.6]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1332) [spring-boot-2.5.6.jar:2.5.6]
at com.course.Application.main(Application.java:28) [classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.jdbc.datasource.DataSourceTransactionManager]: Factory method 'transactionManager' threw exception; nested exception is java.lang.NoClassDefFoundError: org/springframework/jdbc/support/JdbcTransactionManager
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.3.12.jar:5.3.12]
at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:653) ~[spring-beans-5.3.12.jar:5.3.12]
... 19 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/springframework/jdbc/support/JdbcTransactionManager
at org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration$JdbcTransactionManagerConfiguration.createTransactionManager(DataSourceTransactionManagerAutoConfiguration.java:67) ~[spring-boot-autoconfigure-2.5.6.jar:2.5.6]
at org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration$JdbcTransactionManagerConfiguration.transactionManager(DataSourceTransactionManagerAutoConfiguration.java:61) ~[spring-boot-autoconfigure-2.5.6.jar:2.5.6]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_151]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_151]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_151]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_151]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.3.12.jar:5.3.12]
... 20 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.jdbc.support.JdbcTransactionManager
at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[na:1.8.0_151]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_151]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335) ~[na:1.8.0_151]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_151]
... 27 common frames omitted
这个问题一直找不到原因，求看一下什么原因
resultType="Integer" 这里至少和你声明的返回类型不一样，改对之后，不清楚还会不会有这个报错，可以试试
应该是启动应用里少了@ComponentScan
老哥，测试也要学习开发框架了么
实体类是 User 吧，还有 mysql.xml 里 namespace 写错了吧，有 com.course.Dao.UserDao？
对
阿里阿多
回复
阿里阿多
回复
user 是实体类，是的，那个写错了，修改为 <mapper namespace="com.course.mapper.userMapper">,这个改好后问题还存在
现在错误变为
"C:\Program Files\Java\jdk1.8.0_202\bin\java.exe" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always "-javaagent:D:\Java_IDE\IntelliJ IDEA 2021.1.3\lib\idea_rt.jar=50458:D:\Java_IDE\IntelliJ IDEA 2021.1.3\bin" -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_202\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_202\jre\lib\rt.jar;D:\me\java_test_pro\SpringbootMybatis\target\classes;C:\Users\DD\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.5.6\spring-boot-starter-web-2.5.6.jar;C:\Users\DD\.m2\repository\org\springframework\boot\spring-boot-starter\2.5.6\spring-boot-starter-2.5.6.jar;C:\Users\DD\.m2\repository\org\springframework\boot\spring-boot\2.5.6\spring-boot-2.5.6.jar;C:\Users\DD\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.5.6\spring-boot-autoconfigure-2.5.6.jar;C:\Users\DD\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.5.6\spring-boot-starter-logging-2.5.6.jar;C:\Users\DD\.m2\repository\ch\qos\logback\logback-classic\1.2.6\logback-classic-1.2.6.jar;C:\Users\DD\.m2\repository\ch\qos\logback\logback-core\1.2.6\logback-core-1.2.6.jar;C:\Users\DD\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.14.1\log4j-to-slf4j-2.14.1.jar;C:\Users\DD\.m2\repository\org\apache\logging\log4j\log4j-api\2.14.1\log4j-api-2.14.1.jar;C:\Users\DD\.m2\repository\org\slf4j\jul-to-slf4j\1.7.32\jul-to-slf4j-1.7.32.jar;C:\Users\DD\.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\DD\.m2\repository\org\yaml\snakeyaml\1.28\snakeyaml-1.28.jar;C:\Users\DD\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.5.6\spring-boot-starter-json-2.5.6.jar;C:\Users\DD\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.12.5\jackson-databind-2.12.5.jar;C:\Users\DD\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.12.5\jackson-annotations-2.12.5.jar;C:\Users\DD\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.12.5\jackson-core-2.12.5.jar;C:\Users\DD\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.12.5\jackson-datatype-jdk8-2.12.5.jar;C:\Users\DD\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.12.5\jackson-datatype-jsr310-2.12.5.jar;C:\Users\DD\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.12.5\jackson-module-parameter-names-2.12.5.jar;C:\Users\DD\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.5.6\spring-boot-starter-tomcat-2.5.6.jar;C:\Users\DD\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.54\tomcat-embed-core-9.0.54.jar;C:\Users\DD\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.54\tomcat-embed-el-9.0.54.jar;C:\Users\DD\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.54\tomcat-embed-websocket-9.0.54.jar;C:\Users\DD\.m2\repository\org\springframework\spring-web\5.3.12\spring-web-5.3.12.jar;C:\Users\DD\.m2\repository\org\springframework\spring-webmvc\5.3.12\spring-webmvc-5.3.12.jar;C:\Users\DD\.m2\repository\org\springframework\spring-aop\5.3.12\spring-aop-5.3.12.jar;C:\Users\DD\.m2\repository\org\springframework\spring-context\5.3.12\spring-context-5.3.12.jar;C:\Users\DD\.m2\repository\org\springframework\spring-expression\5.3.12\spring-expression-5.3.12.jar;C:\Users\DD\.m2\repository\org\mybatis\spring\boot\mybatis-spring-boot-starter\2.1.3\mybatis-spring-boot-starter-2.1.3.jar;C:\Users\DD\.m2\repository\org\mybatis\spring\boot\mybatis-spring-boot-autoconfigure\2.1.3\mybatis-spring-boot-autoconfigure-2.1.3.jar;C:\Users\DD\.m2\repository\org\mybatis\mybatis\3.5.5\mybatis-3.5.5.jar;C:\Users\DD\.m2\repository\org\mybatis\mybatis-spring\2.0.5\mybatis-spring-2.0.5.jar;C:\Users\DD\.m2\repository\org\projectlombok\lombok\1.18.20\lombok-1.18.20.jar;C:\Users\DD\.m2\repository\org\springframework\spring-jdbc\5.3.4\spring-jdbc-5.3.4.jar;C:\Users\DD\.m2\repository\org\springframework\spring-beans\5.3.4\spring-beans-5.3.4.jar;C:\Users\DD\.m2\repository\org\springframework\spring-core\5.3.4\spring-core-5.3.4.jar;C:\Users\DD\.m2\repository\org\springframework\spring-jcl\5.3.4\spring-jcl-5.3.4.jar;C:\Users\DD\.m2\repository\org\springframework\spring-tx\5.3.4\spring-tx-5.3.4.jar;C:\Users\DD\.m2\repository\com\alibaba\fastjson\1.2.76\fastjson-1.2.76.jar;C:\Users\DD\.m2\repository\org\springframework\boot\spring-boot-starter-jdbc\2.3.0.RELEASE\spring-boot-starter-jdbc-2.3.0.RELEASE.jar;C:\Users\DD\.m2\repository\com\zaxxer\HikariCP\3.4.5\HikariCP-3.4.5.jar;C:\Users\DD\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\DD\.m2\repository\mysql\mysql-connector-java\5.1.6\mysql-connector-java-5.1.6.jar" com.course.Application
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.5.6)
2022-11-08 18:24:49.474 INFO 37164 --- [ main] com.course.Application : Starting Application using Java 1.8.0_202 on LAPTOP-52L2UDTT with PID 37164 (D:\me\java_test_pro\SpringbootMybatis\target\classes started by DD in D:\me\java_test_pro\SpringbootMybatis)
2022-11-08 18:24:49.476 INFO 37164 --- [ main] com.course.Application : No active profile set, falling back to default profiles: default
2022-11-08 18:24:50.259 INFO 37164 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8082 (http)
2022-11-08 18:24:50.273 INFO 37164 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-11-08 18:24:50.273 INFO 37164 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.54]
2022-11-08 18:24:50.343 INFO 37164 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-11-08 18:24:50.344 INFO 37164 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 834 ms
2022-11-08 18:24:50.648 WARN 37164 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping]: Factory method 'requestMappingHandlerMapping' threw exception; nested exception is java.lang.NoSuchMethodError: org.springframework.core.log.LogDelegateFactory.getHiddenLog(Ljava/lang/String;)Lorg/apache/commons/logging/Log;
2022-11-08 18:24:50.648 WARN 37164 --- [ main] .s.c.a.CommonAnnotationBeanPostProcessor : Destroy method on bean with name 'application' threw an exception: java.lang.NullPointerException
2022-11-08 18:24:50.650 INFO 37164 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2022-11-08 18:24:50.659 INFO 37164 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-11-08 18:24:50.669 ERROR 37164 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
org.springframework.web.servlet.handler.AbstractHandlerMapping.<init>(AbstractHandlerMapping.java:83)
The following method did not exist:
org.springframework.core.log.LogDelegateFactory.getHiddenLog(Ljava/lang/String;)Lorg/apache/commons/logging/Log;
The method's class, org.springframework.core.log.LogDelegateFactory, is available from the following locations:
jar:file:/C:/Users/DD/.m2/repository/org/springframework/spring-core/5.3.4/spring-core-5.3.4.jar!/org/springframework/core/log/LogDelegateFactory.class
The class hierarchy was loaded from the following locations:
org.springframework.core.log.LogDelegateFactory: file:/C:/Users/DD/.m2/repository/org/springframework/spring-core/5.3.4/spring-core-5.3.4.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of org.springframework.core.log.LogDelegateFactory
Process finished with exit code 1
usermapper 中的方法名要和 xml 中 id 对应上吧
