NPE in ClientSessionFactoryImpl - NettySymmetricClusterWithBackupTest

An issue has been identified where an NullPointerException can occur in ClientSessionFactoryImpl if the platform is shut down while activity is still occurring. Messages similar to the following are reported in the log. The workaround to this issue is to first confirm that there is no activity when shutting down the server. <screen> [junit] java.lang.NullPointerException     [junit] at org.hornetq.core.client.impl.ClientSessionFactoryImpl$PingRunnable.send(ClientSessionFactoryImpl.java:1656)     [junit] at org.hornetq.core.client.impl.ClientSessionFactoryImpl.getConnection(ClientSessionFactoryImpl.java:1289)     [junit] at org.hornetq.core.client.impl.ClientSessionFactoryImpl.getConnectionWithRetry(ClientSessionFactoryImpl.java:992)     [junit] at org.hornetq.core.client.impl.ClientSessionFactoryImpl.connect(ClientSessionFactoryImpl.java:223)     [junit] at org.hornetq.core.client.impl.ServerLocatorImpl$StaticConnector$Connector.tryConnect(ServerLocatorImpl.java:1792)     [junit] at org.hornetq.core.client.impl.ServerLocatorImpl$StaticConnector.connect(ServerLocatorImpl.java:1629)     [junit] at org.hornetq.core.client.impl.ServerLocatorImpl.connect(ServerLocatorImpl.java:592)     [junit] at org.hornetq.core.client.impl.ServerLocatorImpl$3.run(ServerLocatorImpl.java:559)     [junit] at org.hornetq.utils.OrderedExecutorFactory$OrderedExecutor$1.run(OrderedExecutorFactory.java:100)     [junit] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)     [junit] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)     [junit] at java.lang.Thread.run(Thread.java:662) </screen>