死锁发生在DefaultSingletonBeanRegistry和CachingConnectionFactory中创建bean时。

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英文:

Deadlock while creating bean in DefaultSingletonBeanRegistry and CachingConnectionFactory

问题

My application finds deadlock while bean initialization. Two beans are waiting and holding resources required by one another in different threads. During the bean initialization "BeanA" class has taken lock of connectionMonitor object by calling method [CachingConnectionFactory >> createConnection()] and waiting for lock of ConcurrentHashMap singletonObjects in DefaultSingletonBeanRegistry. Whereas "BeanB" has taken lock of ConcurrentHashMap singletonObjects by calling method [DefaultSingletonBeanRegistry >> getSingleton()] and is waiting for lock of connectionMonitor object in CachingConnectionFactory.

Thread dump :-

Thread 1 :-

   java.lang.Thread.State: BLOCKED (on object monitor)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:187)
- waiting to lock <0x000008001202c048> (a java.util.concurrent.ConcurrentHashMap)
at org.springframework.beans.factory.support.AbstractBeanFactory.isSingleton(AbstractBeanFactory.java:399)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:431)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:395)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:515)
at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:1197)
at org.springframework.amqp.rabbit.core.RabbitAdmin.initialize(RabbitAdmin.java:457)
at org.springframework.amqp.rabbit.core.RabbitAdmin$11.onCreate(RabbitAdmin.java:419)
at org.springframework.amqp.rabbit.connection.CompositeConnectionListener.onCreate(CompositeConnectionListener.java:33)
at org.springframework.amqp.rabbit.connection.CachingConnectionFactory.createConnection(CachingConnectionFactory.java:553)
- locked <0x000009fff2a3a620> (a java.lang.Object)
at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils$1.createConnection(ConnectionFactoryUtils.java:90)
at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.doGetTransactionalResourceHolder(ConnectionFactoryUtils.java:140)
at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.getTransactionalResourceHolder(ConnectionFactoryUtils.java:76)
at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:496)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1331)
at java.lang.Thread.run(Thread.java:748)

Thread 2 :-

   java.lang.Thread.State: BLOCKED (on object monitor)
at org.springframework.amqp.rabbit.connection.CachingConnectionFactory.createConnection(CachingConnectionFactory.java:544)
- waiting to lock <0x000009fff2a3a620> (a java.lang.Object)
at org.springframework.amqp.rabbit.core.RabbitTemplate.doExecute(RabbitTemplate.java:1431)
at org.springframework.amqp.rabbit.core.RabbitTemplate.execute(RabbitTemplate.java:1412)
at org.springframework.amqp.rabbit.core.RabbitTemplate.execute(RabbitTemplate.java:1388)
at org.springframework.amqp.rabbit.core.RabbitAdmin.declareQueue(RabbitAdmin.java:207)
<some call stack lines removed from here for privacy>
- locked <0x000008001202c048> (a java.util.concurrent.ConcurrentHashMap)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:372)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)

I am trying to establish connection to rabbit in the @PostConstruct method something like below:-

BeanA {
    
    @PostConstruct
    public void init() {
      <call to CachingConnectionFactory.createConnection is made using some code)>
    }
}

BeanB {
    
    @PostConstruct
    public void init() {
      <call to CachingConnectionFactory.createConnection is made using some code)>
    }
}

Please suggest what needs to be done. Thanks

英文:

My application finds deadlock while bean initialization. Two beans are waiting and holding resources required by one another in different threads. During the bean initialization "BeanA" class has taken lock of &quot;connectionMonitor&quot; object by calling method [CachingConnectionFactory &gt;&gt; createConnection()] and waiting for lock of ConcurrentHashMap &quot;singletonObjects&quot; in DefaultSingletonBeanRegistry. Whereas "BeanB" has taken lock of ConcurrentHashMap &quot;singletonObjects&quot; by calling method [DefaultSingletonBeanRegistry &gt;&gt; getSingleton()] and is waiting for lock of "connectionMonitor" object in CachingConnectionFactory.

Thread dump :-

Thread 1:-

   java.lang.Thread.State: BLOCKED (on object monitor)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:187)
- waiting to lock &lt;0x000008001202c048&gt; (a java.util.concurrent.ConcurrentHashMap)
at org.springframework.beans.factory.support.AbstractBeanFactory.isSingleton(AbstractBeanFactory.java:399)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:431)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:395)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:515)
at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:1197)
at org.springframework.amqp.rabbit.core.RabbitAdmin.initialize(RabbitAdmin.java:457)
at org.springframework.amqp.rabbit.core.RabbitAdmin$11.onCreate(RabbitAdmin.java:419)
at org.springframework.amqp.rabbit.connection.CompositeConnectionListener.onCreate(CompositeConnectionListener.java:33)
at org.springframework.amqp.rabbit.connection.CachingConnectionFactory.createConnection(CachingConnectionFactory.java:553)
- locked &lt;0x000009fff2a3a620&gt; (a java.lang.Object)
at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils$1.createConnection(ConnectionFactoryUtils.java:90)
at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.doGetTransactionalResourceHolder(ConnectionFactoryUtils.java:140)
at org.springframework.amqp.rabbit.connection.ConnectionFactoryUtils.getTransactionalResourceHolder(ConnectionFactoryUtils.java:76)
at org.springframework.amqp.rabbit.listener.BlockingQueueConsumer.start(BlockingQueueConsumer.java:496)
at org.springframework.amqp.rabbit.listener.SimpleMessageListenerContainer$AsyncMessageProcessingConsumer.run(SimpleMessageListenerContainer.java:1331)
at java.lang.Thread.run(Thread.java:748)

Thread 2:-

   java.lang.Thread.State: BLOCKED (on object monitor)
at org.springframework.amqp.rabbit.connection.CachingConnectionFactory.createConnection(CachingConnectionFactory.java:544)
- waiting to lock &lt;0x000009fff2a3a620&gt; (a java.lang.Object)
at org.springframework.amqp.rabbit.core.RabbitTemplate.doExecute(RabbitTemplate.java:1431)
at org.springframework.amqp.rabbit.core.RabbitTemplate.execute(RabbitTemplate.java:1412)
at org.springframework.amqp.rabbit.core.RabbitTemplate.execute(RabbitTemplate.java:1388)
at org.springframework.amqp.rabbit.core.RabbitAdmin.declareQueue(RabbitAdmin.java:207)
&lt;some call stack lines removed from here for privacy&gt;
- locked &lt;0x000008001202c048&gt; (a java.util.concurrent.ConcurrentHashMap)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:372)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)

I am trying to establish connection to rabbit in the @PostConstruct method something like below:-

BeanA {
    
    @PostConstruct
    public void init() {
      &lt;call to CachingConnectionFactory.createConnection is made using some code)&gt;
    }
}

BeanB {
    
    @PostConstruct
    public void init() {
      &lt;call to CachingConnectionFactory.createConnection is made using some code)&gt;
    }
}

Please suggest what needs to be done. Thanks

答案1

得分: 2

这是您要的翻译:

现在获取低级资源,比如在初始化阶段获取连接,还为时过早。

考虑实现SmartLifecycle,并在start() 实现中调用createConnection(),而不是使用@PostConstruct

英文:

It is too early to get access to low-level resources like connection from the initialization phase.

Consider to implement a SmartLifecycle and call that createConnection() from the start() implementation instead of that @PostConstruct.

huangapple
  • 本文由 发表于 2020年8月31日 19:57:27
  • 转载请务必保留本文链接:https://go.coder-hub.com/63670363.html
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