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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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