Hi
We have 3 brokers connected to Zookeeper using replicated leveldb. Some
times we get the following INFO message on Master

*Client session timed out, have not heard from server in 2xxxms for
sessionid xxxxx* 
we do have  zkSessionTimeout="3s"
and the broker recycles and starts as slave, most of the times it becomes
slave successfully. but some times while restarting gives the following
warning and broker dies

2017-02-01 17:24:33,062 | WARN  | Exception while executing listener
(ignored) | org.apache.activemq.leveldb.replicated.groups.ZKClient |
ZooKeeper state change dispatcher thread
java.lang.NullPointerException
        at
org.linkedin.zookeeper.tracker.ZooKeeperTreeTracker.raiseEvents(ZooKeeperTreeTracker.java:402)[org.linkedin.zookeeper-impl-1.4.0.jar:]
        at
org.linkedin.zookeeper.tracker.ZooKeeperTreeTracker.track(ZooKeeperTreeTracker.java:240)[org.linkedin.zookeeper-impl-1.4.0.jar:]
        at
org.linkedin.zookeeper.tracker.ZooKeeperTreeTracker.track(ZooKeeperTreeTracker.java:228)[org.linkedin.zookeeper-impl-1.4.0.jar:]
        at
org.apache.activemq.leveldb.replicated.groups.ZooKeeperGroup.onConnected(ZooKeeperGroup.scala:124)[activemq-leveldb-store-5.13.3.jar:5.13.3]
        at
org.apache.activemq.leveldb.replicated.groups.ZKClient.callListeners(ZKClient.java:385)[activemq-leveldb-store-5.13.3.jar:5.13.3]
        at
org.apache.activemq.leveldb.replicated.groups.ZKClient$StateChangeDispatcher.run(ZKClient.java:354)[activemq-leveldb-store-5.13.3.jar:5.13.3]
2017-02-01 17:24:33,065 | ERROR | Failed to start Apache ActiveMQ
([broker-aamqwafiu1-amq, null], java.lang.NullPointerException) |
org.apache.activemq.broker.BrokerService | main
2017-02-01 17:24:33,066 | INFO  | Apache ActiveMQ 5.13.3
(broker-aamqwafiu1-amq, null) is shutting down |
org.apache.activemq.broker.BrokerService | main
2017-02-01 17:24:33,067 | INFO  | Connector openwire stopped |
org.apache.activemq.broker.TransportConnector | main
2017-02-01 17:24:33,068 | INFO  | StateChangeDispatcher terminated. |
org.apache.activemq.leveldb.replicated.groups.ZKClient | ZooKeeper state
change dispatcher thread
2017-02-01 17:24:33,071 | INFO  | Session: 0x458b45c4bc3001e closed |
org.apache.zookeeper.ZooKeeper | main
2017-02-01 17:24:33,072 | INFO  | EventThread shut down |
org.apache.zookeeper.ClientCnxn | main-EventThread
2017-02-01 17:24:33,174 | INFO  | Apache ActiveMQ 5.13.3
(broker-aamqwafiu1-amq, null) uptime 0.178 seconds |
org.apache.activemq.broker.BrokerService | main
2017-02-01 17:24:33,175 | INFO  | Apache ActiveMQ 5.13.3
(broker-aamqwafiu1-amq, null) is shutdown |
org.apache.activemq.broker.BrokerService | main
2017-02-01 17:24:33,176 | INFO  | Closing
org.apache.activemq.xbean.XBeanBrokerFactory$1@717ee24a: startup date [Wed
Feb 01 17:24:32 EST 2017]; root of context hierarchy |
org.apache.activemq.xbean.XBeanBrokerFactory$1 | main
2017-02-01 17:24:33,177 | WARN  | Exception thrown from LifecycleProcessor
on context close | org.apache.activemq.xbean.XBeanBrokerFactory$1 | main
java.lang.IllegalStateException: LifecycleProcessor not initialized - call
'refresh' before invoking lifecycle methods via the context:
org.apache.activemq.xbean.XBeanBrokerFactory$1@717ee24a: startup date [Wed
Feb 01 17:24:32 EST 2017]; root of context hierarchy
        at
org.springframework.context.support.AbstractApplicationContext.getLifecycleProcessor(AbstractApplicationContext.java:357)[spring-context-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:884)[spring-context-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:843)[spring-context-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.apache.activemq.hooks.SpringContextHook.run(SpringContextHook.java:30)[activemq-spring-5.13.3.jar:5.13.3]
        at
org.apache.activemq.broker.BrokerService.stop(BrokerService.java:873)[activemq-broker-5.13.3.jar:5.13.3]
        at
org.apache.activemq.xbean.XBeanBrokerService.stop(XBeanBrokerService.java:122)[activemq-spring-5.13.3.jar:5.13.3]
        at
org.apache.activemq.broker.BrokerService.start(BrokerService.java:627)[activemq-broker-5.13.3.jar:5.13.3]
        at
org.apache.activemq.xbean.XBeanBrokerService.afterPropertiesSet(XBeanBrokerService.java:73)[activemq-spring-5.13.3.jar:5.13.3]
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native
Method)[:1.7.0_60]
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)[:1.7.0_60]
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.7.0_60]
        at java.lang.reflect.Method.invoke(Method.java:606)[:1.7.0_60]
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeCustomInitMethod(AbstractAutowireCapableBeanFactory.java:1700)[spring-beans-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1639)[spring-beans-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1568)[spring-beans-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)[spring-beans-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)[spring-beans-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)[spring-beans-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)[spring-beans-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)[spring-beans-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)[spring-beans-4.1.9.RELEASE.jar:4.1.9.RELEASE]
        at
org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)[spring-beans-4.1.9.RELEASE.jar:4.1.9.RELEASE]


We are using 
Zookeeper 3.4.8
activemq 5.13.3

Any insight is appreciated




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