spring事务@Transactional

定义一个项目测试 spring 的事务支持情况

项目准备

创建一个名为 mybatis-transaction 的 spring boot 2.x 项目，引入 mybatis 的依赖，如下

使用 spring 官网的脚手架生成项目 https://start.spring.io/

下载完毕后 pom.xml 如下

<?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 https://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>2.7.15</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>mybatis-transaction</artifactId><version>0.0.1-SNAPSHOT</version><name>mybatis-transaction</name><description>Demo project for Spring Boot</description><properties><java.version>8</java.version></properties><dependencies><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.3.2</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-starter</artifactId><version>1.2.18</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

其中，对应的组件版本如下

组件名	版本	作用	说明
spring-boot-starter-parent	2.7.15	项目的基础架构	spring 2.x 的高版本
mybatis-spring-boot-starter	2.3.2	mybatis持久层	官方支持 spring boot 2.x 的最后一个版本
druid-spring-boot-starter	1.2.18	数据库连接池	官方支持 spring boot 2.x 的最后一个版本
mysql-connector-j	无需指定	mysql数据库连接驱动jar

从后面的版本开始，就是需要使用 spring boot 3.x，但是需要使用 jdk 17。

数据库使用了 mysql 8.0.28。

创建数据库和对应的 ddl

CREATE DATABASE mybatis_transaction;USE mybatis_transaction;CREATE TABLE `user`
(
`id` BIGINT UNSIGNED AUTO_INCREMENT COMMENT 'id',
`name` VARCHAR(50) NOT NULL COMMENT '用户名',
PRIMARY KEY (`id`)
) ENGINE=INNODB CHARSET=utf8mb4 COMMENT='用户表';INSERT INTO `user`(`id`, `name`) VALUES (1, '1');CREATE TABLE `user_login_history`
(
`id` BIGINT UNSIGNED AUTO_INCREMENT COMMENT 'id',
`user_id` BIGINT UNSIGNED NOT NULL COMMENT  '用户id',
`operate_time` DATETIME NOT NULL COMMENT '操作时间',
PRIMARY KEY (`id`)
) ENGINE=INNODB CHARSET=utf8mb4 COMMENT='用户登录历史表';

代码目录结构

java 代码如下

package com.example.controller;import com.example.entity.User;
import com.example.service.UserService;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;import javax.annotation.Resource;
import java.io.Serializable;
import java.util.concurrent.atomic.LongAdder;@RestController
public class UserController implements Serializable {@Resourceprivate UserService userService;private LongAdder counter = new LongAdder();@GetMapping(value = "test")public String test() throws Throwable {User user = new User();user.setId(1L);user.setName("11");counter.add(1L);String string = String.valueOf(counter.longValue());user.setName(string);int no = userService.insert(user);return no > 0 ? "success" : "fail";}
}

package com.example.dao;import com.example.entity.UserLoginHistory;import java.io.Serializable;public interface UserLoginHistoryMapper extends Serializable {int insert(UserLoginHistory userLoginHistory);
}

package com.example.dao;import com.example.entity.User;import java.io.Serializable;public interface UserMapper extends Serializable {int insert(User user);int update(User user);
}

package com.example.entity;import java.io.Serializable;public class User implements Serializable {private static final long serialVersionUID = 1L;private Long id;private String name;public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}
}

package com.example.entity;import java.io.Serializable;
import java.time.LocalDateTime;public class UserLoginHistory implements Serializable {private static final long serialVersionUID = 1L;private Long id;private Long userId;private LocalDateTime operateTime;public Long getId() {return id;}public void setId(Long id) {this.id = id;}public Long getUserId() {return userId;}public void setUserId(Long userId) {this.userId = userId;}public LocalDateTime getOperateTime() {return operateTime;}public void setOperateTime(LocalDateTime operateTime) {this.operateTime = operateTime;}
}

package com.example.service;import com.example.entity.User;import java.io.Serializable;public interface UserService extends Serializable {int insert(User user) throws Exception;
}

修改用户名，插入相关记录，整体执行。

package com.example.service;import com.example.dao.UserLoginHistoryMapper;
import com.example.dao.UserMapper;
import com.example.entity.User;
import com.example.entity.UserLoginHistory;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.FileCopyUtils;import javax.annotation.Resource;
import java.io.File;
import java.io.IOException;
import java.time.LocalDateTime;@Service
public class UserServiceImpl implements UserService {@Resourceprivate UserMapper userMapper;@Resourceprivate UserLoginHistoryMapper userLoginHistoryMapper;@Transactional(rollbackFor = Exception.class)public int insert(User user) throws Exception {UserLoginHistory userLoginHistory = new UserLoginHistory();userLoginHistory.setUserId(1L);// userLoginHistory.setId(1L);userLoginHistory.setOperateTime(LocalDateTime.now());userLoginHistoryMapper.insert(userLoginHistory);int no = userMapper.update(user);File file = new File("fdsfd");File newFile = new File("fsdfs");try {FileCopyUtils.copy(file, newFile);} catch (IOException e) {throw e;}// Integer temp = null;// temp++;// int i = 1 / 0;return 0;}
}

package com.example.service;import com.example.dao.UserLoginHistoryMapper;
import com.example.entity.UserLoginHistory;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import javax.annotation.Resource;
import java.io.Serializable;@Service
public class UserLoginHistoryService implements Serializable {@Resourceprivate UserLoginHistoryMapper userLoginHistoryMapper;@Transactionalpublic int insert(UserLoginHistory userLoginHistory) {int no = userLoginHistoryMapper.insert(userLoginHistory);return no;}
}

xml 代码如下

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.dao.UserMapper"><insert id="insert" parameterType="com.example.entity.User">insert into `user`(`id`, `name`) values (#{id}, #{name})</insert><update id="update" parameterType="com.example.entity.User">update `user` set `name` = #{name} where `id` = #{id}</update>
</mapper>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.dao.UserLoginHistoryMapper"><insert id="insert" parameterType="com.example.entity.UserLoginHistory">insert into `user_login_history`(`id` , `user_id`, `operate_time`) values (#{id}, #{userId}, #{operateTime})</insert>
</mapper>

配置文件

application.yml

spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/mybatis_transaction?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false&zeroDateTimeBehavior=convertToNull&allowMultiQueries=trueusername: rootpassword: 123456mybatis:mapper-locations: classpath:mapper/*.xml

设置数据库连接信息和 mybatis 的 mapper 位置

启动类

package com.example;import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@MapperScan(basePackages = {"com.example.dao"})
@SpringBootApplication
public class MybatisTransactionApplication {public static void main(String[] args) {SpringApplication.run(MybatisTransactionApplication.class, args);}}

指定 mapper 接口的位置

上述代码刚开始第一次不行，后面项目删除后重新弄了一遍好了。

验证过程

RuntimeException 异常

@Transactional 未设置任何值验证一个除0异常，UserServiceImpl 修改代码如下

package com.example.service;import com.example.dao.UserLoginHistoryMapper;
import com.example.dao.UserMapper;
import com.example.entity.User;
import com.example.entity.UserLoginHistory;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.FileCopyUtils;import javax.annotation.Resource;
import java.io.File;
import java.io.IOException;
import java.time.LocalDateTime;@Service
public class UserServiceImpl implements UserService {@Resourceprivate UserMapper userMapper;@Resourceprivate UserLoginHistoryMapper userLoginHistoryMapper;@Transactionalpublic int insert(User user) throws Exception {UserLoginHistory userLoginHistory = new UserLoginHistory();userLoginHistory.setUserId(1L);// userLoginHistory.setId(1L);userLoginHistory.setOperateTime(LocalDateTime.now());userLoginHistoryMapper.insert(userLoginHistory);int no = userMapper.update(user);// File file = new File("fdsfd");// File newFile = new File("fsdfs");// try {//     FileCopyUtils.copy(file, newFile);// } catch (IOException e) {//     throw e;// }// Integer temp = null;// temp++;int i = 1 / 0;return 0;}
}

即 @Transactional 不加任何设置，默认回滚类型异常为 RuntimeException 或者 Error 的子类，ArithmeticException 为 RuntimeException 的子类符合要求。

异常堆栈信息如下

java.lang.ArithmeticException: / by zeroat com.example.service.UserServiceImpl.insert(UserServiceImpl.java:48) ~[classes/:na]at com.example.service.UserServiceImpl$$FastClassBySpringCGLIB$$a5ace360.invoke(<generated>) ~[classes/:na]at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:793) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123) ~[spring-tx-5.3.29.jar:5.3.29]at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) ~[spring-tx-5.3.29.jar:5.3.29]at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.29.jar:5.3.29]at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708) ~[spring-aop-5.3.29.jar:5.3.29]at com.example.service.UserServiceImpl$$EnhancerBySpringCGLIB$$11a39b4c.insert(<generated>) ~[classes/:na]at com.example.controller.UserController.test(UserController.java:32) ~[classes/:na]at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0-292]at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0-292]at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0-292]at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0-292]at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1072) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:965) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.29.jar:5.3.29]at javax.servlet.http.HttpServlet.service(HttpServlet.java:529) ~[tomcat-embed-core-9.0.79.jar:4.0.FR]at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.29.jar:5.3.29]at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) ~[tomcat-embed-core-9.0.79.jar:4.0.FR]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1790) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.79.jar:9.0.79]at java.lang.Thread.run(Thread.java:748) [na:1.8.0-292]

执行完后表 user_login_history 无记录。

非 RuntimeException 异常

@Transactional 设置 rollbackFor 为 Exception

UserServiceImpl 代码回退到刚开始，即在两个不存在的文件中复制数据。

异常堆栈信息如下

java.nio.file.NoSuchFileException: fdsfdat sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:79) ~[na:1.8.0-292]at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97) ~[na:1.8.0-292]at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102) ~[na:1.8.0-292]at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:230) ~[na:1.8.0-292]at java.nio.file.Files.newByteChannel(Files.java:361) ~[na:1.8.0-292]at java.nio.file.Files.newByteChannel(Files.java:407) ~[na:1.8.0-292]at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:384) ~[na:1.8.0-292]at java.nio.file.Files.newInputStream(Files.java:152) ~[na:1.8.0-292]at org.springframework.util.FileCopyUtils.copy(FileCopyUtils.java:68) ~[spring-core-5.3.29.jar:5.3.29]at com.example.service.UserServiceImpl.insert(UserServiceImpl.java:41) ~[classes/:na]at com.example.service.UserServiceImpl$$FastClassBySpringCGLIB$$a5ace360.invoke(<generated>) ~[classes/:na]at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:793) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123) ~[spring-tx-5.3.29.jar:5.3.29]at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) ~[spring-tx-5.3.29.jar:5.3.29]at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.29.jar:5.3.29]at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708) ~[spring-aop-5.3.29.jar:5.3.29]at com.example.service.UserServiceImpl$$EnhancerBySpringCGLIB$$11a39b4c.insert(<generated>) ~[classes/:na]at com.example.controller.UserController.test(UserController.java:32) ~[classes/:na]at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0-292]at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0-292]at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0-292]at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0-292]at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1072) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:965) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.29.jar:5.3.29]at javax.servlet.http.HttpServlet.service(HttpServlet.java:529) ~[tomcat-embed-core-9.0.79.jar:4.0.FR]at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.29.jar:5.3.29]at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) ~[tomcat-embed-core-9.0.79.jar:4.0.FR]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1790) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.79.jar:9.0.79]at java.lang.Thread.run(Thread.java:748) [na:1.8.0-292]

数据库数据无新增，说明正常。

@Transactional 未设置任何值

UserServiceImpl 代码修改如下

package com.example.service;import com.example.dao.UserLoginHistoryMapper;
import com.example.dao.UserMapper;
import com.example.entity.User;
import com.example.entity.UserLoginHistory;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.FileCopyUtils;import javax.annotation.Resource;
import java.io.File;
import java.io.IOException;
import java.time.LocalDateTime;@Service
public class UserServiceImpl implements UserService {@Resourceprivate UserMapper userMapper;@Resourceprivate UserLoginHistoryMapper userLoginHistoryMapper;@Transactionalpublic int insert(User user) throws Exception {UserLoginHistory userLoginHistory = new UserLoginHistory();userLoginHistory.setUserId(1L);// userLoginHistory.setId(1L);userLoginHistory.setOperateTime(LocalDateTime.now());userLoginHistoryMapper.insert(userLoginHistory);int no = userMapper.update(user);File file = new File("fdsfd");File newFile = new File("fsdfs");try {FileCopyUtils.copy(file, newFile);} catch (IOException e) {throw e;}// Integer temp = null;// temp++;// int i = 1 / 0;return 0;}
}

异常堆栈信息如下

java.nio.file.NoSuchFileException: fdsfdat sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:79) ~[na:1.8.0-292]at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97) ~[na:1.8.0-292]at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102) ~[na:1.8.0-292]at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:230) ~[na:1.8.0-292]at java.nio.file.Files.newByteChannel(Files.java:361) ~[na:1.8.0-292]at java.nio.file.Files.newByteChannel(Files.java:407) ~[na:1.8.0-292]at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:384) ~[na:1.8.0-292]at java.nio.file.Files.newInputStream(Files.java:152) ~[na:1.8.0-292]at org.springframework.util.FileCopyUtils.copy(FileCopyUtils.java:68) ~[spring-core-5.3.29.jar:5.3.29]at com.example.service.UserServiceImpl.insert(UserServiceImpl.java:41) ~[classes/:na]at com.example.service.UserServiceImpl$$FastClassBySpringCGLIB$$a5ace360.invoke(<generated>) ~[classes/:na]at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:793) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123) ~[spring-tx-5.3.29.jar:5.3.29]at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) ~[spring-tx-5.3.29.jar:5.3.29]at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.29.jar:5.3.29]at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) ~[spring-aop-5.3.29.jar:5.3.29]at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708) ~[spring-aop-5.3.29.jar:5.3.29]at com.example.service.UserServiceImpl$$EnhancerBySpringCGLIB$$50627c19.insert(<generated>) ~[classes/:na]at com.example.controller.UserController.test(UserController.java:32) ~[classes/:na]at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0-292]at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0-292]at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0-292]at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0-292]at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1072) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:965) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.29.jar:5.3.29]at javax.servlet.http.HttpServlet.service(HttpServlet.java:529) ~[tomcat-embed-core-9.0.79.jar:4.0.FR]at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.29.jar:5.3.29]at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) ~[tomcat-embed-core-9.0.79.jar:4.0.FR]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1790) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.79.jar:9.0.79]at java.lang.Thread.run(Thread.java:748) [na:1.8.0-292]

查询后有数据，说明事务未生效。

这两种区别产生的原因是什么？

通过 @Transactional 在源码中进行搜索，发现通过 SpringTransactionAnnotationParser 获取 @Transactional 修饰的方法后进行事务属性处理，最终包装为 RuleBasedTransactionAttribute 对象进行传递。

https://github.com/spring-projects/spring-framework/blob/v5.3.29/spring-tx/src/main/java/org/springframework/transaction/annotation/SpringTransactionAnnotationParser.java#L68

@Transactional 配置了 rollbackFor 的值为 Exception.class

https://github.com/spring-projects/spring-framework/blob/v5.3.29/spring-tx/src/main/java/org/springframework/transaction/interceptor/TransactionAspectSupport.java#L670

@Transactional 未配置任何值

可以看到，@Transactional 配置了 rollbackFor 的值为 Exception.class 后对应的 RuleBasedTransactionAttribute 多了指定的值。

判断是否符合回滚要求

调用 TransactionAttribute 的实现类进行责任链模式调用匹配最终的异常类型判断是否进行回滚。

DelegatingTransactionAttribute
↓
RuleBasedTransactionAttribute
↓
DefaultTransactionAttribute

如果方法上的 @Transactional 配置了 rollbackFor 的值且未指定 noRollbackFor 的值，则将其填充到 RollbackRuleAttribute 中，在 RuleBasedTransactionAttribute 中调用 RollbackRuleAttribute 的 getDepth() 层层递归获取到设置的类的全路径名，不调用 DefaultTransactionAttribute。

如果方法上的 @Transactional 未配置回滚或者不回滚的异常，则对应的 winner 变量为 null，调用父类 DefaultTransactionAttribute 中的 rollbackOn()

public boolean rollbackOn(Throwable ex) {return (ex instanceof RuntimeException || ex instanceof Error);
}

判断是否是 RuntimeException 或者 Error 的子类，如果是，则符合回滚要求，执行回滚。

通过源码得知如下

如果需要事务的方法上添加了 @Transactional(rollbackFor = Exception.class)，则遇到异常都会抛出，否则就会执行事务管理器的提交处理。

@Transactional 的 rollbackFor 源码中标明了需要指定的是 Throwable 的子类，按照异常类的继承关系，Exception 是所有异常的父类，所以指定了 Exception 就包含大部分遇到的异常了。

事务怎么实现的

UserServiceImpl 中的 @Transactional 代码行注释掉

执行堆栈如下

java.nio.file.NoSuchFileException: fdsfdat sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:79) ~[na:1.8.0-292]at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97) ~[na:1.8.0-292]at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102) ~[na:1.8.0-292]at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:230) ~[na:1.8.0-292]at java.nio.file.Files.newByteChannel(Files.java:361) ~[na:1.8.0-292]at java.nio.file.Files.newByteChannel(Files.java:407) ~[na:1.8.0-292]at java.nio.file.spi.FileSystemProvider.newInputStream(FileSystemProvider.java:384) ~[na:1.8.0-292]at java.nio.file.Files.newInputStream(Files.java:152) ~[na:1.8.0-292]at org.springframework.util.FileCopyUtils.copy(FileCopyUtils.java:68) ~[spring-core-5.3.29.jar:5.3.29]at com.example.service.UserServiceImpl.insert(UserServiceImpl.java:41) ~[classes/:na]at com.example.controller.UserController.test(UserController.java:32) ~[classes/:na]at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0-292]at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0-292]at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0-292]at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0-292]at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1072) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:965) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.29.jar:5.3.29]at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.29.jar:5.3.29]at javax.servlet.http.HttpServlet.service(HttpServlet.java:529) ~[tomcat-embed-core-9.0.79.jar:4.0.FR]at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.29.jar:5.3.29]at javax.servlet.http.HttpServlet.service(HttpServlet.java:623) ~[tomcat-embed-core-9.0.79.jar:4.0.FR]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:209) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.29.jar:5.3.29]at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.29.jar:5.3.29]at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:178) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:153) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:926) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1790) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.79.jar:9.0.79]at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.79.jar:9.0.79]at java.lang.Thread.run(Thread.java:748) [na:1.8.0-292]

对比之后发现是通过 aop 实现的，默认 spring boot 用的是 cglib 进行字节码增强。

这样执行下来全局事务就不生效了，数据插入到数据库中，因为事务机制是通过扫描 @Transactional 修饰的方法生成对应的代理对象来实现的。

其中，代理类实现有两种方式，java 自带的动态代理和 cglib 代理。

修改 application.yml 如下

spring:datasource:driver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/mybatis_transaction?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true&useSSL=false&zeroDateTimeBehavior=convertToNull&allowMultiQueries=trueusername: rootpassword: 123456aop:proxy-target-class: falsemybatis:mapper-locations: classpath:mapper/*.xml

即，单独指定了 spring.aop.proxy-target-class=false，这样就不默认使用 cglib 生成代理类了，但是这样需要单独定义 interface 以及对应实现类。

对比发现，CglibAopProxy 变成了 JdkDynamicAopProxy。