SpringBoot如果服务@Transactional的方法不是公共的会发生什么？(1)

先说如果方法是public的，再研究细节@ServicepublicclassTestServiceImpl{@Transactional(rollbackFor=Exception.class)publicvoidtrans1(){}}AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsAfterInitialization()，其中applyBeanPostProcessorsAfterInitialization()继承自AbatorstractAutoProxy下是方法细节publicObjectapplyBeanPostProcessorsAfterInitialization(ObjectexistingBean,StringbeanName)throwsBeansException{Objectresult=existingBean;//getBeanPostProcessors()是sptringboot启动时系统配置的BeanPostProcessor；其中有一个BeanPostProcessor叫做AnnotationAwareAspectJAutoProxyCreator；for(BeanPostProcessorbeanProcessor:getBeanPostProcessors()){//WhentraversingAnnotationAwareAspectJAutoProxyCreator,executeitspostProcessAfterInitialization()Objectcurrent=beanProcessor.postProcessAfterInitialization(结果，豆名）；if(current==null){返回结果；}结果=当前的;}返回结果；}以下是AbstractAutoProxyCreator.postProcessAfterInitialization()的详细信息：if(!this.earlyProxyReferences.contains(cacheKey)){//该方法的重要逻辑是根据beanName获取通知列表，如果列表不为空，则创建代理类；返回wrapIfNecessary(bean,beanName,cacheKey);}}返回豆；}图2图3protectedObjectwrapIfNecessary(Objectbean,StringbeanName,ObjectcacheKey){//获取bean和beanName获取通知列表。Object[]specificInterceptors=getAdvicesAndAdvisorsForBean(bean.getClass(),beanName,null);//本例中testServiceImpl的具体拦截器如图2所示；//如果通知列表不为空，创建代理类if(specificInterceptors!=DO_NOT_PROXY){this.advisedBeans.put(cacheKey,Boolean.TRUE);//执行具体的创建代理逻辑。本例中testServiceImpl的specificInterceptors如图3所示。this.proxyTypes.put(cacheKey,proxy.getClass());//直接returnreturnproxy;}//如果没有匹配的通知列表，返回一个普通beanthis.advisedBeans.put(cacheKey,Boolean.FALSE);returnbean;}如果我们在测试的情况下去掉public呢？，我们直接贴出结果：图4显示specificInterceptors=null，也就是说没有为其生成代理类。是什么原因？我们继续往下看：//candidateAdvisors来自springboot启动配置通知列表try{//具体匹配逻辑由AopUtils.findAdvisorsThatCanApply()执行returnAopUtils.findAdvisorsThatCanApply(candidateAdvisors,beanClass);}最后{ProxyCreationContext.setCurrentProxiedBeanName(null);我们可以看到等待选择的通知列表有24个图5publicstaticbooleancanApply(Pointcutpc,ClasstargetClass,booleanhasIntroductions){IntroductionAwareMethodMatcherintroductionAwareMethodMatcher=null;如果(methodMatcherinstanceofIntroductionAwareMethodMatcher){introductionAwareMethodMatcher=(IntroductionAwareMethodMatcher)methodMatcher;}Set>classes=newLinkedHashSet<>();如果(!Proxy.isProxyClass(targetClass)){classes.add(ClassUtils.getUserClass(targetClass));}classes.addAll(ClassUtils.getAllInterfacesForClassAsSet(targetClass));对于(Classclazz:classes){Method[]methods=ReflectionUtils.getAllDeclaredMethods(clazz);for(Methodmethod:methods){//因为introductionAwareMethodMatcher==null,所以methodMatcher.matches实际上执行了我们的候选通知器match方法；如果(introductionAwareMethodMatcher!=null?introductionAwareMethodMatcher.matches(method,targetClass,hasIntroductions):methodMatcher.matches(method,targetClass)){returntrue;}}}返回假；}图6以TransactionAttributeSourcePointcut.matches()为例：图7publicbooleanmatches(Methodmethod,@NullableClasstargetClass){if(targetClass!=null&&TransactionalProxy.class.isAssignableFrom(targetClass)){returnfalse;}//图7显示tas实例TransactionAttributeSourcetas=getTransactionAttributeSource();返回（tas==null||tas.getTransactionAttribute（方法，targetClass）！=null）；}publicTransactionAttributegetTransactionAttribute(Methodmethod,@NullableClasstargetClass){//我们需要解决它。事务属性utetxAttr=computeTransactionAttribute(method,targetClass);return(tas==null||tas.getTransactionAttribute(method,targetClass)!=null);}tas.getTransactionAttribute()将调用AbstractFallbackTransactionAttributeSource.computeTransactionAttribute():ProtectedTransactionCompactionAttribute方法，@NullableClasstargetClass){//Don'根据需要允许非公共方法。//通过上面的注释，我们可以看出，非public是不允许的，所以返回null；如果(allowPublicMethodsOnly()&&!Modifier.isPublic(method.getModifiers())){返回null;}}这时候上面的matches()返回false，最后AopUtils.findAdvisorsThatCanApply(candidateAdvisors,beanClass)返回一个空列表，所以AbstractAutoProxyCreator.wrapIfNecessary()中的specificInterceptors变量如果为null，就没有办法创建一个代理类！最后再提一个问题，如果一个服务的@Transactional方法同时有public和no-public怎么办？欢迎一起讨论~~~