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From "Josef Spillner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (AMQ-2272) JMX/transport connector exception due to lack of entropy in randomness device
Date Fri, 29 May 2009 07:01:50 GMT

    [ https://issues.apache.org/activemq/browse/AMQ-2272?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=51976#action_51976
] 

Josef Spillner commented on AMQ-2272:
-------------------------------------

As an addition, removing /dev/random and symlinking it to /dev/urandom can be used as a workaround.
I've placed this into ActiveMQ's init script. Yuck!

> JMX/transport connector exception due to lack of entropy in randomness device
> -----------------------------------------------------------------------------
>
>                 Key: AMQ-2272
>                 URL: https://issues.apache.org/activemq/browse/AMQ-2272
>             Project: ActiveMQ
>          Issue Type: Bug
>          Components: JMX
>    Affects Versions: 5.2.0
>         Environment: Linux / User-Mode-Linux virtualisation
>            Reporter: Josef Spillner
>
> [This report is probably not describing a bug in ActiveMQ itself, but it shows up when
using ActiveMQ and prevents it from functioning correctly, this is why I'm starting to report
it at this level of the stack. Depending on feedback, it can be propagated further down the
stack.]
> When running ActiveMQ on User-Mode-Linux, some of its parts (notably the transport connector
registration with JMX) fails because some random id cannot be created due to lack of entropy
in /dev/random. As opposed to /dev/urandom, /dev/random is known to not have a lot of entropy
and to block any read access until the pool is filled up again. This is a known, documented
and correct behaviour. For some reason, it seems that the Sun implementation's seed generator
accesses this device in non-blocking mode and fails to read random numbers. Or maybe it is
instrumented to do so from the code which uses it.
> Among other issues, it means that the listener on port 61616 is running while the Stomp
listener on port 61613 won't be active. It would be nice to have someone with knowledge of
the stack, including the use of Spring, to see whose fault causes this issue.
> This is the full backtrace:
> ERROR: java.lang.Exception: org.springframework.beans.factory.BeanCreationException:
Error creating bean with name 'org.apache.activemq.xbean.XBeanBrokerService#0' defined in
class path resource [activemq.xml]: Invocation of init method failed; nested exception is
java.io.IOException: Transport Connector could not be registered in JMX: URLSeedGenerator
file:/dev/random reached end of file   
> java.lang.Exception: org.springframework.beans.factory.BeanCreationException: Error creating
bean with name 'org.apache.activemq.xbean.XBeanBrokerService#0' defined in class path resource
[activemq.xml]: Invocation of init method failed; nested exception is java.io.IOException:
Transport Connector could not be registered in JMX: URLSeedGenerator file:/dev/random reached
end of file          
>         at org.apache.activemq.console.command.StartCommand.runTask(StartCommand.java:99)
                                                                                         
                 
>         at org.apache.activemq.console.command.AbstractCommand.execute(AbstractCommand.java:57)
                                                                                         
           
>         at org.apache.activemq.console.command.ShellCommand.runTask(ShellCommand.java:129)
                                                                                         
                
>         at org.apache.activemq.console.command.AbstractCommand.execute(AbstractCommand.java:57)
                                                                                         
           
>         at org.apache.activemq.console.command.ShellCommand.main(ShellCommand.java:79)
                                                                                         
                    
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)              
                                                                                         
                      
>         at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
                                                                                         
                  
>         at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
                                                                                         
          
>         at java.lang.reflect.Method.invoke(Method.java:616)                         
                                                                                         
                      
>         at org.apache.activemq.console.Main.runTaskClass(Main.java:225)             
                                                                                         
                      
>         at org.apache.activemq.console.Main.main(Main.java:106)                     
                                                                                         
                      
> Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'org.apache.activemq.xbean.XBeanBrokerService#0' defined in class path resource
[activemq.xml]: Invocation of init method failed; nested exception is java.io.IOException:
Transport Connector could not be registered in JMX: URLSeedGenerator file:/dev/random reached
end of file                    
>         at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1337)
                                                
>         at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:473)
                                                   
>         at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
                                                          
>         at java.security.AccessController.doPrivileged(Native Method)               
                                                                                         
                      
>         at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
                                                     
>         at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
                                                                                  
>         at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:221)
                                                               
>         at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
                                                                                    
>         at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
                                                                                      
>         at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
                                                                                      
>         at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:429)
                                                       
>         at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:729)
                                                      
>         at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:381)
                                                                              
>         at org.apache.xbean.spring.context.ResourceXmlApplicationContext.<init>(ResourceXmlApplicationContext.java:64)
                                                                              
>         at org.apache.xbean.spring.context.ResourceXmlApplicationContext.<init>(ResourceXmlApplicationContext.java:52)
                                                                              
>         at org.apache.activemq.xbean.XBeanBrokerFactory.createApplicationContext(XBeanBrokerFactory.java:96)at
org.apache.activemq.xbean.XBeanBrokerFactory.createBroker(XBeanBrokerFactory.java:52) 
>         at org.apache.activemq.broker.BrokerFactory.createBroker(BrokerFactory.java:71)
                                                                                         
                   
>         at org.apache.activemq.broker.BrokerFactory.createBroker(BrokerFactory.java:54)
                                                                                         
                   
>         at org.apache.activemq.console.command.StartCommand.startBroker(StartCommand.java:115)
                                                                                         
            
>         at org.apache.activemq.console.command.StartCommand.runTask(StartCommand.java:74)
                                                                                         
                 
>         ... 10 more                                                                 
                                                                                         
                      
> Caused by: java.io.IOException: Transport Connector could not be registered in JMX: URLSeedGenerator
file:/dev/random reached end of file                                                     
      
>         at org.apache.activemq.util.IOExceptionSupport.create(IOExceptionSupport.java:27)
                                                                                         
                 
>         at org.apache.activemq.broker.BrokerService.registerConnectorMBean(BrokerService.java:1434)
                                                                                         
       
>         at org.apache.activemq.broker.BrokerService.startTransportConnector(BrokerService.java:1893)
                                                                                         
      
>         at org.apache.activemq.broker.BrokerService.startAllConnectors(BrokerService.java:1844)
                                                                                         
           
>         at org.apache.activemq.broker.BrokerService.start(BrokerService.java:480)   
                                                                                         
                      
>         at org.apache.activemq.xbean.XBeanBrokerService.afterPropertiesSet(XBeanBrokerService.java:52)
                                                                                         
    
>         at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1368)
                                             
>         at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1334)
                                                
>         ... 30 more                                                                 
                                                                                         
                      
> Caused by: java.lang.InternalError: URLSeedGenerator file:/dev/random reached end of
file                                                                                     
                      
>         at sun.security.provider.SeedGenerator$URLSeedGenerator.getSeedByte(SeedGenerator.java:478)
                                                                                         
       
>         at sun.security.provider.SeedGenerator.getSeedBytes(SeedGenerator.java:140) 
                                                                                         
                      
>         at sun.security.provider.SeedGenerator.generateSeed(SeedGenerator.java:135) 
                                                                                         
                      
>         at sun.security.provider.SecureRandom.engineGenerateSeed(SecureRandom.java:131)
                                                                                         
                   
>         at sun.security.provider.SecureRandom.engineNextBytes(SecureRandom.java:188)
                                                                                         
                      
>         at java.security.SecureRandom.nextBytes(SecureRandom.java:450)              
                                                                                         
                      
>         at java.security.SecureRandom.next(SecureRandom.java:472)                   
                                                                                         
                      
>         at java.util.Random.nextInt(Random.java:204)                                
                                                                                         
                      
>         at sun.security.ssl.SSLContextImpl.engineInit(SSLContextImpl.java:102)      
                                                                                         
                      
>         at javax.net.ssl.SSLContext.init(SSLContext.java:265)                       
                                                                                         
                      
>         at org.apache.activemq.broker.SslContext.getSSLContext(SslContext.java:126) 
                                                                                         
                      
>         at org.apache.activemq.transport.tcp.SslTransportFactory.createServerSocketFactory(SslTransportFactory.java:155)
                                                                            
>         at org.apache.activemq.transport.tcp.SslTransportFactory.doBind(SslTransportFactory.java:76)
                                                                                         
      
>         at org.apache.activemq.transport.TransportFactory.bind(TransportFactory.java:131)
                                                                                         
                 
>         at org.apache.activemq.broker.TransportConnector.createTransportServer(TransportConnector.java:293)
                                                                                         
>         at org.apache.activemq.broker.TransportConnector.getServer(TransportConnector.java:135)
                                                                                         
           
>         at org.apache.activemq.broker.TransportConnector.asManagedConnector(TransportConnector.java:98)
                                                                                         
   
>         at org.apache.activemq.broker.BrokerService.registerConnectorMBean(BrokerService.java:1428)
                                                                                         
       
>         ... 36 more

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