caused by: java.lang.ClassNotFoundException: org.springframework.transaction.ReactiveTransactionMana

SpringBoot启动时报错如下：

Java包冲突问题解决：

Dspring.application.admin.enabled=true "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2020.2.3\lib\idea_rt.jar=6377:C:\Program Files\JetBrains\IntelliJ IDEA 2020.2.3\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_271\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_271\jre\lib\rt.jar;C:\TheLastRoadofBigData\parent\SPRINGBOOT-ORDER-USER\target\classes;C:\Users\YungChiping\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.3.7.RELEASE\spring-boot-starter-web-2.3.7.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\boot\spring-boot-starter\2.3.7.RELEASE\spring-boot-starter-2.3.7.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\boot\spring-boot\2.3.7.RELEASE\spring-boot-2.3.7.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.3.7.RELEASE\spring-boot-autoconfigure-2.3.7.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.3.7.RELEASE\spring-boot-starter-logging-2.3.7.RELEASE.jar;C:\Users\YungChiping\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\YungChiping\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\YungChiping\.m2\repository\org\slf4j\slf4j-api\1.7.25\slf4j-api-1.7.25.jar;C:\Users\YungChiping\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.13.3\log4j-to-slf4j-2.13.3.jar;C:\Users\YungChiping\.m2\repository\org\apache\logging\log4j\log4j-api\2.13.3\log4j-api-2.13.3.jar;C:\Users\YungChiping\.m2\repository\org\slf4j\jul-to-slf4j\1.7.30\jul-to-slf4j-1.7.30.jar;C:\Users\YungChiping\.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\YungChiping\.m2\repository\org\springframework\spring-core\5.2.12.RELEASE\spring-core-5.2.12.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\spring-jcl\5.2.12.RELEASE\spring-jcl-5.2.12.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\yaml\snakeyaml\1.26\snakeyaml-1.26.jar;C:\Users\YungChiping\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.3.7.RELEASE\spring-boot-starter-json-2.3.7.RELEASE.jar;C:\Users\YungChiping\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.11.3\jackson-databind-2.11.3.jar;C:\Users\YungChiping\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.11.3\jackson-annotations-2.11.3.jar;C:\Users\YungChiping\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.11.3\jackson-core-2.11.3.jar;C:\Users\YungChiping\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.11.3\jackson-datatype-jdk8-2.11.3.jar;C:\Users\YungChiping\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.11.3\jackson-datatype-jsr310-2.11.3.jar;C:\Users\YungChiping\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.11.3\jackson-module-parameter-names-2.11.3.jar;C:\Users\YungChiping\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.3.7.RELEASE\spring-boot-starter-tomcat-2.3.7.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.41\tomcat-embed-core-9.0.41.jar;C:\Users\YungChiping\.m2\repository\org\glassfish\jakarta.el\3.0.3\jakarta.el-3.0.3.jar;C:\Users\YungChiping\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.41\tomcat-embed-websocket-9.0.41.jar;C:\Users\YungChiping\.m2\repository\org\springframework\spring-web\5.2.12.RELEASE\spring-web-5.2.12.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\spring-beans\5.2.12.RELEASE\spring-beans-5.2.12.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\spring-webmvc\5.2.12.RELEASE\spring-webmvc-5.2.12.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\spring-aop\5.2.12.RELEASE\spring-aop-5.2.12.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\spring-context\5.2.12.RELEASE\spring-context-5.2.12.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\spring-expression\5.2.12.RELEASE\spring-expression-5.2.12.RELEASE.jar;C:\Users\YungChiping\.m2\repository\com\alibaba\druid\1.0.14\druid-1.0.14.jar;C:\Program Files\Java\jdk1.8.0_271\lib\jconsole.jar;C:\Program Files\Java\jdk1.8.0_271\lib\tools.jar;C:\Users\YungChiping\.m2\repository\mysql\mysql-connector-java\5.1.44\mysql-connector-java-5.1.44.jar;C:\Users\YungChiping\.m2\repository\org\mybatis\spring\boot\mybatis-spring-boot-starter\1.3.0\mybatis-spring-boot-starter-1.3.0.jar;C:\Users\YungChiping\.m2\repository\org\springframework\boot\spring-boot-starter-jdbc\1.5.2.RELEASE\spring-boot-starter-jdbc-1.5.2.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\apache\tomcat\tomcat-jdbc\8.5.11\tomcat-jdbc-8.5.11.jar;C:\Users\YungChiping\.m2\repository\org\apache\tomcat\tomcat-juli\8.5.11\tomcat-juli-8.5.11.jar;C:\Users\YungChiping\.m2\repository\org\springframework\spring-jdbc\4.3.7.RELEASE\spring-jdbc-4.3.7.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\springframework\spring-tx\4.3.7.RELEASE\spring-tx-4.3.7.RELEASE.jar;C:\Users\YungChiping\.m2\repository\org\mybatis\spring\boot\mybatis-spring-boot-autoconfigure\1.3.0\mybatis-spring-boot-autoconfigure-1.3.0.jar;C:\Users\YungChiping\.m2\repository\org\mybatis\mybatis\3.4.4\mybatis-3.4.4.jar;C:\Users\YungChiping\.m2\repository\org\mybatis\mybatis-spring\1.3.1\mybatis-spring-1.3.1.jar" cn.tedu.StarterOrderUser

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.7.RELEASE)

2021-01-27 23:15:20.188  INFO 19412 --- [           main] cn.tedu.StarterOrderUser                 : Starting StarterOrderUser on LAPTOP-H6R968ME with PID 19412 (C:\TheLastRoadofBigData\parent\SPRINGBOOT-ORDER-USER\target\classes started by YungChiping in C:\TheLastRoadofBigData\parent)
2021-01-27 23:15:20.188  INFO 19412 --- [           main] cn.tedu.StarterOrderUser                 : No active profile set, falling back to default profiles: default
2021-01-27 23:15:20.672 ERROR 19412 --- [           main] o.s.boot.SpringApplication               : Application run failed

java.lang.IllegalStateException: Error processing condition on org.springframework.boot.autoconfigure.web.client.RestTemplateAutoConfiguration.restTemplateBuilder
	at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:60) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.context.annotation.ConditionEvaluator.shouldSkip(ConditionEvaluator.java:108) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForBeanMethod(ConfigurationClassBeanDefinitionReader.java:184) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitionsForConfigurationClass(ConfigurationClassBeanDefinitionReader.java:144) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassBeanDefinitionReader.loadBeanDefinitions(ConfigurationClassBeanDefinitionReader.java:120) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.processConfigBeanDefinitions(ConfigurationClassPostProcessor.java:331) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanDefinitionRegistry(ConfigurationClassPostProcessor.java:236) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanDefinitionRegistryPostProcessors(PostProcessorRegistrationDelegate.java:280) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:96) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:707) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:533) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at cn.tedu.StarterOrderUser.main(StarterOrderUser.java:11) [classes/:na]
Caused by: java.lang.IllegalStateException: Failed to introspect Class [org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:481) ~[spring-core-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:358) ~[spring-core-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:414) ~[spring-core-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.lambda$getTypeForFactoryMethod$2(AbstractAutowireCapableBeanFactory.java:742) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1688) ~[na:1.8.0_271]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:741) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:680) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:648) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1614) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:523) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:495) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.boot.autoconfigure.condition.OnBeanCondition.collectBeanNamesForType(OnBeanCondition.java:238) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getBeanNamesForType(OnBeanCondition.java:231) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getBeanNamesForType(OnBeanCondition.java:221) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getMatchingBeans(OnBeanCondition.java:169) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.autoconfigure.condition.OnBeanCondition.getMatchOutcome(OnBeanCondition.java:144) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.autoconfigure.condition.SpringBootCondition.matches(SpringBootCondition.java:47) ~[spring-boot-autoconfigure-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	... 18 common frames omitted
Caused by: java.lang.NoClassDefFoundError: org/springframework/transaction/ReactiveTransactionManager
	at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_271]
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_271]
	at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_271]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:463) ~[spring-core-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	... 34 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.transaction.ReactiveTransactionManager
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_271]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[na:1.8.0_271]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355) ~[na:1.8.0_271]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[na:1.8.0_271]
	... 38 common frames omitted

2021-01-27 23:15:20.688  WARN 19412 --- [           main] o.s.boot.SpringApplication               : Unable to close ApplicationContext

java.lang.IllegalStateException: Failed to introspect Class [org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration] from ClassLoader [sun.misc.Launcher$AppClassLoader@18b4aac2]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:481) ~[spring-core-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:358) ~[spring-core-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:414) ~[spring-core-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.lambda$getTypeForFactoryMethod$2(AbstractAutowireCapableBeanFactory.java:742) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1688) ~[na:1.8.0_271]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:741) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:680) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:648) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1614) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:523) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:495) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:620) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:612) ~[spring-beans-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:1243) ~[spring-context-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	at org.springframework.boot.SpringApplication.getExitCodeFromMappedException(SpringApplication.java:880) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.getExitCodeFromException(SpringApplication.java:868) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.handleExitCode(SpringApplication.java:855) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.handleRunFailure(SpringApplication.java:806) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:325) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.7.RELEASE.jar:2.3.7.RELEASE]
	at cn.tedu.StarterOrderUser.main(StarterOrderUser.java:11) [classes/:na]
Caused by: java.lang.NoClassDefFoundError: org/springframework/transaction/ReactiveTransactionManager
	at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_271]
	at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_271]
	at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_271]
	at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:463) ~[spring-core-5.2.12.RELEASE.jar:5.2.12.RELEASE]
	... 21 common frames omitted
Caused by: java.lang.ClassNotFoundException: org.springframework.transaction.ReactiveTransactionManager
	at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_271]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:418) ~[na:1.8.0_271]
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355) ~[na:1.8.0_271]
	at java.lang.ClassLoader.loadClass(ClassLoader.java:351) ~[na:1.8.0_271]
	... 25 common frames omitted


Process finished with exit code 1

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解决：

1.查看jar包依赖关系。

2.查看后，发现，主要是中间这两个jar包冲突。

换一个版本。

enjoy it !!!