This is fixed in ActiveMQ Artemis 1.3.0

https://issues.apache.org/jira/browse/ARTEMIS-385

MultipleThreadsOpeningTest will fail eventually because of this.
avax.jms.JMSException: Failed to create session factory
at org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory.createConnectionInternal(ActiveMQConnectionFactory.java:727)
at org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory.createConnection(ActiveMQConnectionFactory.java:233)
at org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory.createConnection(ActiveMQConnectionFactory.java:229)
at org.apache.activemq.artemis.tests.integration.jms.cluster.MultipleThreadsOpeningTest$1ThreadOpen.run(MultipleThreadsOpeningTest.java:59)
Caused by: ActiveMQConnectionTimedOutException[errorType=CONNECTION_TIMEDOUT message=AMQ119013: Timed out waiting to receive cluster topology. Group:null]
at org.apache.activemq.artemis.core.client.impl.ServerLocatorImpl.createSessionFactory(ServerLocatorImpl.java:861)
at org.apache.activemq.artemis.jms.client.ActiveMQConnectionFactory.createConnectionInternal(ActiveMQConnectionFactory.java:724)
... 3 more