Springboot 事务回滚不生效可能出现的原因

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1.点进去 @SpringBootApplication
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2.再点进去 @EnableAutoConfiguration
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3.可以看到类上的注解 有一个 @Import(AutoConfigurationImportSelector.class) 自动装配的选择器
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4.进入AutoConfigurationImportSelector类中 可以看到有个getAutoConfigurationEntry()方法
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   AutoConfigurationEntry autoConfigurationEntry = getAutoConfigurationEntry(annotationMetadata);
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5.方法中又调用了 getCandidateConfigurations()方法
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6.在getCandidateConfigurations()方法中可以很清楚的看到有一个断言
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    Assert.notEmpty(configurations, "No auto configuration classes found in META-INF/spring.factories. If you "
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        + "are using a custom packaging, make sure that file is correct.");
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重点就在于 META-INF/spring.factories 文件
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7.进入到jar包中找到该文件 大概130行
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    org.springframework.boot.autoconfigure.transaction.TransactionAutoConfiguration
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8.进入TransactionAutoConfiguration类中可以看到一下源码 有这个一个注解 @EnableTransactionManagement
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@Configuration(proxyBeanMethods = false)
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@ConditionalOnBean(TransactionManager.class)
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@ConditionalOnMissingBean(AbstractTransactionManagementConfiguration.class)
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public static class EnableTransactionManagementConfiguration {
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  @Configuration(proxyBeanMethods = false)
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  @EnableTransactionManagement(proxyTargetClass = false)
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  @ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "false",
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      matchIfMissing = false)
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  public static class JdkDynamicAutoProxyConfiguration {
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  }
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  @Configuration(proxyBeanMethods = false)
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  @EnableTransactionManagement(proxyTargetClass = true)
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  @ConditionalOnProperty(prefix = "spring.aop", name = "proxy-target-class", havingValue = "true",
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      matchIfMissing = true)
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  public static class CglibAutoProxyConfiguration {
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  }
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}