在實(shí)際開(kāi)發(fā)過(guò)中遇到過(guò)2次，此問(wèn)題隱藏的比較深。
main線(xiàn)程在啟動(dòng)時(shí)，做Ioc容器初始化操作，如果應(yīng)用中涉及到大量的Bean初始化，這個(gè)過(guò)程比較耗時(shí)。
此時(shí)，你的應(yīng)用有個(gè)地方在起了個(gè)線(xiàn)程，該線(xiàn)程執(zhí)行了一些類(lèi)似application.getBean(xxx)的操作，就有可能發(fā)送deadlock.
本質(zhì)原因：IOC容器維護(hù)了兩個(gè)map，分別是BeanDefinitionMap和SingletonObjectMap。前者是bean定義的元數(shù)據(jù)信息，bean的實(shí)例化是基于該元數(shù)據(jù)創(chuàng)建的。如果創(chuàng)建的時(shí)單例，則會(huì)放入singletonObjectMap中。
main線(xiàn)程的加鎖順序：先BeanDefinitionMap后SingletonObjectMap ；子線(xiàn)程是獲取bean是先SingletonObjectMap后BeanDefinitionMap。這個(gè)過(guò)程會(huì)發(fā)生死鎖。
示例：堆棧信息
Thread Name: main
Waited Count: 9 Waited Time: -1ms
Blocked Count: 332 Blocked Time: -1ms
Lock Name: java.lang.Object@34e911de Lock Class Name: java.lang.Object Lock Identity Hash Code: 887689694
Waiting for lock owned by 86 Owner Name: datacollect-1
Locked Monitors
Frame: 21 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry . getSingleton? (DefaultSingletonBeanRegistry.java)
Frame: 35 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry . getSingleton? (DefaultSingletonBeanRegistry.java)
Frame: 40 org.springframework.context.support.AbstractApplicationContext . refresh? (AbstractApplicationContext.java)
Stack Trace
org.springframework.amqp.rabbit.connection.CachingConnectionFactory . createConnection? (CachingConnectionFactory.java:626)
org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils . createConnection? (ConnectionFactoryUtils.java:240)
org.springframework.amqp.rabbit.core.RabbitTemplate . doExecute? (RabbitTemplate.java:1816)
org.springframework.amqp.rabbit.core.RabbitTemplate . execute? (RabbitTemplate.java:1790)
org.springframework.amqp.rabbit.core.RabbitTemplate . execute? (RabbitTemplate.java:1771)
cn.caijiajia.magic.realtimecompute.connector.rabbit.bind.AbstractRabbitExchangeBind . queueBind? (AbstractRabbitExchangeBind.java:70)
cn.caijiajia.magic.realtimecompute.connector.rabbit.bind.AsyncRabbitExchangeBind . synExchange? (AsyncRabbitExchangeBind.java:76)
cn.caijiajia.magic.realtimecompute.connector.rabbit.bind.AsyncRabbitExchangeBind . asyncInitRabbit? (AsyncRabbitExchangeBind.java:68)
sun.reflect.NativeMethodAccessorImpl . invoke0? (NativeMethodAccessorImpl.java) (Native)
sun.reflect.NativeMethodAccessorImpl . invoke? (NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl . invoke? (DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method . invoke? (Method.java:498)
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleElement . invoke? (InitDestroyAnnotationBeanPostProcessor.java:366)
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor$LifecycleMetadata . invokeInitMethods? (InitDestroyAnnotationBeanPostProcessor.java:309)
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor . postProcessBeforeInitialization? (InitDestroyAnnotationBeanPostProcessor.java:136)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory . applyBeanPostProcessorsBeforeInitialization? (AbstractAutowireCapableBeanFactory.java:416)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory . initializeBean? (AbstractAutowireCapableBeanFactory.java:1686)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory . doCreateBean? (AbstractAutowireCapableBeanFactory.java:573)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory . createBean? (AbstractAutowireCapableBeanFactory.java:495)
org.springframework.beans.factory.support.AbstractBeanFactory . lambda$doGetBean$0? (AbstractBeanFactory.java:317)
org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$168/1906808037 . getObject? ()
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry . getSingleton? (DefaultSingletonBeanRegistry.java:222)
org.springframework.beans.factory.support.AbstractBeanFactory . doGetBean? (AbstractBeanFactory.java:315)
org.springframework.beans.factory.support.AbstractBeanFactory . getBean? (AbstractBeanFactory.java:204)
org.springframework.context.annotation.CommonAnnotationBeanPostProcessor . autowireResource? (CommonAnnotationBeanPostProcessor.java:514)
org.springframework.context.annotation.CommonAnnotationBeanPostProcessor . getResource? (CommonAnnotationBeanPostProcessor.java:485)
org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement . getResourceToInject? (CommonAnnotationBeanPostProcessor.java:619)
org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement . inject? (InjectionMetadata.java:180)
org.springframework.beans.factory.annotation.InjectionMetadata . inject? (InjectionMetadata.java:90)
org.springframework.context.annotation.CommonAnnotationBeanPostProcessor . postProcessPropertyValues? (CommonAnnotationBeanPostProcessor.java:318)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory . populateBean? (AbstractAutowireCapableBeanFactory.java:1336)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory . doCreateBean? (AbstractAutowireCapableBeanFactory.java:572)
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory . createBean? (AbstractAutowireCapableBeanFactory.java:495)
org.springframework.beans.factory.support.AbstractBeanFactory . lambda$doGetBean$0? (AbstractBeanFactory.java:317)
org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$168/1906808037 . getObject? ()
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry . getSingleton? (DefaultSingletonBeanRegistry.java:222)
org.springframework.beans.factory.support.AbstractBeanFactory . doGetBean? (AbstractBeanFactory.java:315)
org.springframework.beans.factory.support.AbstractBeanFactory . getBean? (AbstractBeanFactory.java:199)
org.springframework.beans.factory.support.DefaultListableBeanFactory . preInstantiateSingletons? (DefaultListableBeanFactory.java:759)
org.springframework.context.support.AbstractApplicationContext . finishBeanFactoryInitialization? (AbstractApplicationContext.java:867)
org.springframework.context.support.AbstractApplicationContext . refresh? (AbstractApplicationContext.java:548)
org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext . refresh? (ServletWebServerApplicationContext.java:140)
org.springframework.boot.SpringApplication . refresh? (SpringApplication.java:754)
org.springframework.boot.SpringApplication . refreshContext? (SpringApplication.java:386)
org.springframework.boot.SpringApplication . run? (SpringApplication.java:307)
org.springframework.boot.SpringApplication . run? (SpringApplication.java:1242)
org.springframework.boot.SpringApplication . run? (SpringApplication.java:1230)
cn.caijiajia.magic.realtimecompute.RealtimeApplication . main? (RealtimeApplication.java:31)
sun.reflect.NativeMethodAccessorImpl . invoke0? (NativeMethodAccessorImpl.java) (Native)
sun.reflect.NativeMethodAccessorImpl . invoke? (NativeMethodAccessorImpl.java:62)
sun.reflect.DelegatingMethodAccessorImpl . invoke? (DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method . invoke? (Method.java:498)
org.springframework.boot.loader.MainMethodRunner . run? (MainMethodRunner.java:48)
org.springframework.boot.loader.Launcher . launch? (Launcher.java:87)
org.springframework.boot.loader.Launcher . launch? (Launcher.java:50)
org.springframework.boot.loader.JarLauncher . main? (JarLauncher.java:51)
--------------------------------------------------------------------------------
Thread Name: datacollect-1
Waited Count: 3 Waited Time: -1ms
Blocked Count: 13 Blocked Time: -1ms
Lock Name: java.util.concurrent.ConcurrentHashMap@1b841c8 Lock Class Name: java.util.concurrent.ConcurrentHashMap Lock Identity Hash Code: 28852680
Waiting for lock owned by 1 Owner Name: main
Locked Synchronizers
Class Name: java.util.concurrent.ThreadPoolExecutor$Worker Identity Hash Code: 1810349933
Locked Monitors
Frame: 15 org.springframework.amqp.rabbit.connection.CachingConnectionFactory . createConnection? (CachingConnectionFactory.java)
Stack Trace
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry . getSingleton? (DefaultSingletonBeanRegistry.java:179)
org.springframework.beans.factory.support.AbstractBeanFactory . isTypeMatch? (AbstractBeanFactory.java:490)
org.springframework.beans.factory.support.DefaultListableBeanFactory . doGetBeanNamesForType? (DefaultListableBeanFactory.java:426)
org.springframework.beans.factory.support.DefaultListableBeanFactory . getBeanNamesForType? (DefaultListableBeanFactory.java:397)
org.springframework.beans.factory.support.DefaultListableBeanFactory . getBeansOfType? (DefaultListableBeanFactory.java:510)
org.springframework.beans.factory.support.DefaultListableBeanFactory . getBeansOfType? (DefaultListableBeanFactory.java:502)
org.springframework.context.support.AbstractApplicationContext . getBeansOfType? (AbstractApplicationContext.java:1196)
org.springframework.amqp.rabbit.core.RabbitAdmin . initialize? (RabbitAdmin.java:485)
org.springframework.amqp.rabbit.core.RabbitAdmin . lambda$null$9? (RabbitAdmin.java:453)
org.springframework.amqp.rabbit.core.RabbitAdmin$$Lambda$594/1637332799 . doWithRetry? ()
org.springframework.retry.support.RetryTemplate . doExecute? (RetryTemplate.java:287)
org.springframework.retry.support.RetryTemplate . execute? (RetryTemplate.java:164)
org.springframework.amqp.rabbit.core.RabbitAdmin . lambda$afterPropertiesSet$10? (RabbitAdmin.java:452)
org.springframework.amqp.rabbit.core.RabbitAdmin$$Lambda$591/256139608 . onCreate? ()
org.springframework.amqp.rabbit.connection.CompositeConnectionListener . onCreate? (CompositeConnectionListener.java:36)
org.springframework.amqp.rabbit.connection.CachingConnectionFactory . createConnection? (CachingConnectionFactory.java:634)
org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils . createConnection? (ConnectionFactoryUtils.java:240)
cn.caijiajia.rabbitmq.client.CjjRabbitTemplate . doExecute? (CjjRabbitTemplate.java:1467)
cn.caijiajia.rabbitmq.client.CjjRabbitTemplate . access$300? (CjjRabbitTemplate.java:121)
cn.caijiajia.rabbitmq.client.CjjRabbitTemplate$3 . doWithRetry? (CjjRabbitTemplate.java:1420)
org.springframework.retry.support.RetryTemplate . doExecute? (RetryTemplate.java:287)
org.springframework.retry.support.RetryTemplate . execute? (RetryTemplate.java:180)
cn.caijiajia.rabbitmq.client.CjjRabbitTemplate . execute? (CjjRabbitTemplate.java:1411)
cn.caijiajia.rabbitmq.client.CjjRabbitTemplate . sendme? (CjjRabbitTemplate.java:535)
cn.caijiajia.rabbitmq.client.CjjRabbitTemplate . sendTwice? (CjjRabbitTemplate.java:527)
cn.caijiajia.rabbitmq.client.CjjRabbitTemplate . send? (CjjRabbitTemplate.java:513)
cn.caijiajia.rabbitmq.client.CjjRabbitTemplate . convertAndSend? (CjjRabbitTemplate.java:628)
cn.caijiajia.rabbitmq.client.CjjRabbitTemplate . convertAndSend? (CjjRabbitTemplate.java:623)
cn.caijiajia.traceplus.starter.collector.reporter.RabbitmqReporter . report? (RabbitmqReporter.java:46)
cn.caijiajia.traceplus.starter.collector.AbstractDataCollector . syncReport? (AbstractDataCollector.java:143)
cn.caijiajia.traceplus.starter.collector.AbstractDataCollector . lambda$asyncReport$0? (AbstractDataCollector.java:120)
cn.caijiajia.traceplus.starter.collector.AbstractDataCollector$$Lambda$582/962927234 . run? ()
java.util.concurrent.Executors$RunnableAdapter . call? (Executors.java:511)
java.util.concurrent.FutureTask . run? (FutureTask.java:266)
java.util.concurrent.ThreadPoolExecutor . runWorker? (ThreadPoolExecutor.java:1149)
java.util.concurrent.ThreadPoolExecutor$Worker . run? (ThreadPoolExecutor.java:624)
java.lang.Thread . run? (Thread.java:748)
貼一個(gè)堆棧信息：
