https://issues.apache.org/jira/browse/AMQ-5258

Fixed, early created connection is closed so that it can expire or error
out as needed.

activemq-jms-pool/src/main/java/org/apache/activemq/jms/pool/PooledConnectionFactory.java

@@ -285,7 +285,7 @@ public class PooledConnectionFactory implements ConnectionFactory, QueueConnecti
         if (isCreateConnectionOnStartup()) {
             try {
                 // warm the pool by creating a connection during startup
-                createConnection();
+                createConnection().close();
             } catch (JMSException e) {
                 LOG.warn("Create pooled connection during start failed. This exception will be ignored.", e);
             }