基于 Seata 1.4.0 版本
首先貼出此項目地址：Seata 分布式事務版本
先了未添加事務項目再看此版本：未添加事務版本

此文章是基于上一篇的項目基礎上添加的內容，所以務必先看上一篇

Seata介紹

解決分布式事務問題，有兩個設計初衷

對業務無侵入：即減少技術架構上的微服務化所帶來的分布式事務問題對業務的侵入
高性能：減少分布式事務解決方案所帶來的性能消耗

seata中有兩種分布式事務實現方案，AT及TCC

• AT模式主要關注多 DB 訪問的數據一致性，當然也包括多服務下的多 DB 數據訪問一致性問題

• TCC 模式主要關注業務拆分，在按照業務橫向擴展資源時，解決微服務間調用的一致性問題

AT模式

Seata AT模式是基于XA事務演進而來的一個分布式事務中間件，XA是一個基于數據庫實現的分布式事務協議，本質上和兩階段提交一樣，需要數據庫支持，Mysql5.6以上版本支持XA協議，其他數據庫如Oracle，DB2也實現了XA接口

TCC模式

seata也針對TCC做了適配兼容，支持TCC事務方案，原理前面已經介紹過，基本思路就是使用侵入業務上的補償及事務管理器的協調來達到全局事務的一起提交及回滾。

接下來一步一步往上一篇博客的項目加 Seata 內容，達到 Seata 分布式事務的效果

首先介紹下，此次 seata 分布式事務的模式設置為 file，所以先介紹一下 register.conf 和 file.conf 文件

1、register.conf

registry {# file 、nacos 、eureka、redis、zk、consul、etcd3、sofatype = "file" # 這里設置 seata 的模式，這里設置為 filenacos {serverAddr = "localhost:8848"namespace = ""cluster = "default"}eureka {serviceUrl = "http://localhost:8761/eureka"application = "default"weight = "1"}redis {serverAddr = "localhost:6379"db = "0"}zk {cluster = "default"serverAddr = "127.0.0.1:2181"session.timeout = 6000connect.timeout = 2000}consul {cluster = "default"serverAddr = "127.0.0.1:8500"}etcd3 {cluster = "default"serverAddr = "http://localhost:2379"}sofa {serverAddr = "127.0.0.1:9603"application = "default"region = "DEFAULT_ZONE"datacenter = "DefaultDataCenter"cluster = "default"group = "SEATA_GROUP"addressWaitTime = "3000"}file {name = "file.conf"} }config {# file、nacos 、apollo、zk、consul、etcd3type = "file"nacos {serverAddr = "localhost"namespace = ""}consul {serverAddr = "127.0.0.1:8500"}apollo {app.id = "seata-server"apollo.meta = "http://192.168.1.204:8801"}zk {serverAddr = "127.0.0.1:2181"session.timeout = 6000connect.timeout = 2000}etcd3 {serverAddr = "http://localhost:2379"}file {name = "file.conf"} }

2、file.conf

transport {# tcp udt unix-domain-sockettype = "TCP"#NIO NATIVEserver = "NIO"#enable heartbeatheartbeat = true#thread factory for nettythread-factory {boss-thread-prefix = "NettyBoss"worker-thread-prefix = "NettyServerNIOWorker"server-executor-thread-prefix = "NettyServerBizHandler"share-boss-worker = falseclient-selector-thread-prefix = "NettyClientSelector"client-selector-thread-size = 1client-worker-thread-prefix = "NettyClientWorkerThread"# netty boss thread size,will not be used for UDTboss-thread-size = 1#auto default pin or 8worker-thread-size = 8}shutdown {# when destroy server, wait secondswait = 3}serialization = "seata"compressor = "none" } service {#vgroup->rgroup# 這里主要需要注意的地方，my_test_tx_group 名稱必須和 spring.cloud.alibaba.seata.tx-service-group 配置的值一樣vgroup_mapping.my_test_tx_group = "default"#only support single nodedefault.grouplist = "127.0.0.1:8091"#degrade current not supportenableDegrade = false#disabledisable = false#unit ms,s,m,h,d represents milliseconds, seconds, minutes, hours, days, default permanentmax.commit.retry.timeout = "-1"max.rollback.retry.timeout = "-1" }client {async.commit.buffer.limit = 10000lock {retry.internal = 10retry.times = 30}report.retry.count = 5tm.commit.retry.count = 1tm.rollback.retry.count = 1 }## transaction log store store {## store mode: file、dbmode = "db"## file storefile {dir = "sessionStore"# branch session size , if exceeded first try compress lockkey, still exceeded throws exceptionsmax-branch-session-size = 16384# globe session size , if exceeded throws exceptionsmax-global-session-size = 512# file buffer size , if exceeded allocate new bufferfile-write-buffer-cache-size = 16384# when recover batch read sizesession.reload.read_size = 100# async, syncflush-disk-mode = async}## database storedb {## the implement of javax.sql.DataSource, such as DruidDataSource(druid)/BasicDataSource(dbcp) etc.datasource = "dbcp"## mysql/oracle/h2/oceanbase etc.db-type = "mysql"driver-class-name = "com.mysql.jdbc.Driver"url = "jdbc:mysql://127.0.0.1:3306/seata"user = "root"password = "root"min-conn = 1max-conn = 3global.table = "global_table"branch.table = "branch_table"lock-table = "lock_table"query-limit = 100} } lock {## the lock store mode: local、remotemode = "remote"local {## store locks in user's database}remote {## store locks in the seata's server} } recovery {#schedule committing retry period in millisecondscommitting-retry-period = 1000#schedule asyn committing retry period in millisecondsasyn-committing-retry-period = 1000#schedule rollbacking retry period in millisecondsrollbacking-retry-period = 1000#schedule timeout retry period in millisecondstimeout-retry-period = 1000 }transaction {undo.data.validation = trueundo.log.serialization = "jackson"undo.log.save.days = 7#schedule delete expired undo_log in millisecondsundo.log.delete.period = 86400000undo.log.table = "undo_log" }## metrics settings metrics {enabled = falseregistry-type = "compact"# multi exporters use comma dividedexporter-list = "prometheus"exporter-prometheus-port = 9898 }support {## springspring {# auto proxy the DataSource beandatasource.autoproxy = false} }

這里說明下：在使用 Seata 之前，需要先啟動 Seata-server 服務，默認的端口：8091（如下圖）
seata-server 下載地址：下載Seata-Server [自行選擇版本]
詳情看文檔：Seata 快速開始

seata-common 模塊的POM文件注解放開，加上 Seata

<dependencies><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-alibaba-seata</artifactId><version>2.1.0.RELEASE</version></dependency> </dependencies>

分別在除了 seata-eureka, seata-common 模塊的resource目錄下創建 register.cong 和 file.conf 文件，把上面的內容復制進去

修改剛剛加了文件的微服務的 application.yaml 文件，加入如下內容

spring:cloud:alibaba:seata:# 注意，值需要和 file.conf 文件配置的組名一致tx-service-group: my_test_tx_group

使用類DataSourceProxy創建數據源代理。這里DataSourceProxy代理的就是業務數據庫的數據源。所以需要配置代理數據源

/*** @author: qiukangming* @date: 2021/01/07 20:25* @version: 1.0* @description: 代理數據源配置類，在每一個需要分布式事務的微服務中配置一份*/@Configuration public class CustomDataSourceProxyConfig {@Bean@ConfigurationProperties(prefix = "spring.datasource")public DruidDataSource druidDataSource() {return new DruidDataSource();}@Primary@Beanpublic DataSourceProxy dataSource(DruidDataSource druidDataSource) {return new DataSourceProxy(druidDataSource);} }

在創建訂單的方法上面加上 @GlobalTransactional(name = “order-create”, rollbackFor = Exception.class) 注解，設置分布式事務

@GlobalTransactional(name = "order-create", rollbackFor = Exception.class) //分布式事務的全局事務的入口 () public void purchase(String userId, String commodityCode, int count, boolean exception) {//添加日志Date date = new Date();SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");String format = simpleDateFormat.format(date);jdbcTemplate.update("insert into log_info(content,createtime) values('測試','"+format+"') ");//調用feign 下單--->扣款log.info("創建訂單，下單賬戶：[{}] ，商品：[{}]，數量：[{}]", userId, commodityCode, count);orderFeignClient.create(userId, commodityCode, count);log.info("創建訂單完成！！！");//調用feign 扣減庫存log.info("開始遞減 {} 庫存，數量：{}", commodityCode, count);storageFeignClient.deduct(commodityCode, count);log.info("遞減 {} 庫存成功！！！", commodityCode);//扣減余額log.info("開始扣除 {} 賬戶 {} 元！", userId, count * 100);userFeignClient.reduce(userId, count * 100, exception);log.info("扣款成功！！！"); }

到此添加的配置就算加完了，現在啟動微服務測試

• 一般啟動微服務會打印如下信息就說明配置沒有問題

2021-01-08 22:11:05.529 INFO 8564 --- [ main] io.seata.core.rpc.netty.RmRpcClient : register to RM resourceId:jdbc:mysql://localhost:3306/seata_order 2021-01-08 22:11:05.534 INFO 8564 --- [ main] i.s.c.r.netty.NettyClientChannelManager : will connect to 127.0.0.1:8091 2021-01-08 22:11:05.534 INFO 8564 --- [ main] io.seata.core.rpc.netty.RmRpcClient : RM will register :jdbc:mysql://localhost:3306/seata_order 2021-01-08 22:11:05.541 INFO 8564 --- [ main] i.s.core.rpc.netty.NettyPoolableFactory : NettyPool create channel to transactionRole:RMROLE,address:127.0.0.1:8091,msg:< RegisterRMRequest{resourceIds='jdbc:mysql://localhost:3306/seata_order', applicationId='seata-order', transactionServiceGroup='my_test_tx_group'} > 2021-01-08 22:11:06.569 INFO 8564 --- [lector_RMROLE_1] i.s.common.loader.EnhancedServiceLoader : load Codec[SEATA] extension by class[io.seata.codec.seata.SeataCodec] 2021-01-08 22:11:06.705 INFO 8564 --- [ main] io.seata.core.rpc.netty.RmRpcClient : register RM success. server version:1.4.0,channel:[id: 0x865848e9, L:/127.0.0.1:51262 - R:/127.0.0.1:8091] 2021-01-08 22:11:06.705 INFO 8564 --- [ main] i.s.core.rpc.netty.NettyPoolableFactory : register success, cost 177 ms, version:1.4.0,role:RMROLE,channel:[id: 0x865848e9, L:/127.0.0.1:51262 - R:/127.0.0.1:8091]

• 數據庫初始化數據
  
• 測試正常操作流程，下單
  
• 正常執行操作之后的數據庫
  
• 正常執行的控制臺輸出
  
  在其他微服務中也可以看到正常提交事務的打印輸出
• 測試異常情況，就在剛剛的基礎上，就先不重新初始化數據了
  
• 異常操作之后的數據庫
  
• 異常操作之后的控制臺輸出

// 用戶微服務報錯：算術錯誤 除以 0 java.lang.ArithmeticException: / by zero

在其他微服務中也可以看到事務回滾的日志打印

以上就是 Seata file模式的分布式事務的介紹

說難也不難，主要是配置文件需要配置正確

列舉下常見的問題，坑…

• 配置文件配置的seata組名和file.conf配置的不一致
  
• 啟動時報錯

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userApplication': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'jdbcTemplate' defined in com.seata.UserApplication: Unsatisfied dependency expressed through method 'jdbcTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSourceProxy' defined in com.seata.UserApplication: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [io.seata.rm.datasource.DataSourceProxy]: Circular reference involving containing bean 'userApplication' - consider declaring the factory method as static for independence from its containing instance. Factory method 'dataSourceProxy' threw exception; nested exception is java.lang.ExceptionInInitializerErrorat org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:324) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:849) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:142) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:775) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:316) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]at com.seata.UserApplication.main(UserApplication.java:38) [classes/:na] Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'jdbcTemplate' defined in com.seata.UserApplication: Unsatisfied dependency expressed through method 'jdbcTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSourceProxy' defined in com.seata.UserApplication: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [io.seata.rm.datasource.DataSourceProxy]: Circular reference involving containing bean 'userApplication' - consider declaring the factory method as static for independence from its containing instance. Factory method 'dataSourceProxy' threw exception; nested exception is java.lang.ExceptionInInitializerErrorat org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:769) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:509) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1321) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1160) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:204) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeanByName(AbstractAutowireCapableBeanFactory.java:452) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:526) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:496) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:636) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:180) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:321) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]... 17 common frames omitted Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSourceProxy' defined in com.seata.UserApplication: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [io.seata.rm.datasource.DataSourceProxy]: Circular reference involving containing bean 'userApplication' - consider declaring the factory method as static for independence from its containing instance. Factory method 'dataSourceProxy' threw exception; nested exception is java.lang.ExceptionInInitializerErrorat org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:627) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:607) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1321) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1160) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:277) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1247) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1167) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:857) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:760) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]... 33 common frames omitted Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [io.seata.rm.datasource.DataSourceProxy]: Circular reference involving containing bean 'userApplication' - consider declaring the factory method as static for independence from its containing instance. Factory method 'dataSourceProxy' threw exception; nested exception is java.lang.ExceptionInInitializerErrorat org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]... 47 common frames omitted Caused by: java.lang.ExceptionInInitializerError: nullat com.seata.UserApplication.dataSourceProxy(UserApplication.java:56) [classes/:na]at com.seata.UserApplication$$EnhancerBySpringCGLIB$$c53bc05b.CGLIB$dataSourceProxy$0(<generated>) ~[classes/:na]at com.seata.UserApplication$$EnhancerBySpringCGLIB$$c53bc05b$$FastClassBySpringCGLIB$$4aa029ae.invoke(<generated>) ~[classes/:na]at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:244) ~[spring-core-5.1.6.RELEASE.jar:5.1.6.RELEASE]at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:363) ~[spring-context-5.1.6.RELEASE.jar:5.1.6.RELEASE]at com.seata.UserApplication$$EnhancerBySpringCGLIB$$c53bc05b.dataSourceProxy(<generated>) ~[classes/:na]at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_212]at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_212]at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_212]at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_212]at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.1.6.RELEASE.jar:5.1.6.RELEASE]... 48 common frames omitted Caused by: io.seata.common.exception.NotSupportYetException: config type can not be nullat io.seata.config.ConfigurationFactory.buildConfiguration(ConfigurationFactory.java:110) ~[seata-all-1.4.1.jar:1.4.1]at io.seata.config.ConfigurationFactory.getInstance(ConfigurationFactory.java:94) ~[seata-all-1.4.1.jar:1.4.1]at io.seata.rm.datasource.DataSourceProxy.<clinit>(DataSourceProxy.java:62) ~[seata-all-1.4.1.jar:1.4.1]... 59 common frames omitted

這個報錯很坑，解決辦法是把 target 目錄刪除，重新編譯一下就好了[因為我就是這樣，坑了我半天…]，整個估計是在resource目錄下新加文件的時候沒有及時編譯過去

總結

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