Description of problem:

https://datastax-oss.atlassian.net/browse/JAVA-231

This I've seen multiple times:

05:04:47,406 ERROR [com.datastax.driver.core.RequestHandler] (http-/0.0.0.0:7080-394) Unexpected error while querying vp25q03ad-hpan17033701.iad.apple.com/17.176.208.136: java.lang.NullPointerException
        at com.datastax.driver.core.HostConnectionPool.waitForConnection(HostConnectionPool.java:200) [cassandra-driver-core-1.0.5.jar:]
        at com.datastax.driver.core.HostConnectionPool.borrowConnection(HostConnectionPool.java:126) [cassandra-driver-core-1.0.5.jar:]
        at com.datastax.driver.core.RequestHandler.query(RequestHandler.java:122) [cassandra-driver-core-1.0.5.jar:]
        at com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:103) [cassandra-driver-core-1.0.5.jar:]
        at com.datastax.driver.core.Session$Manager.execute(Session.java:459) [cassandra-driver-core-1.0.5.jar:]
        at com.datastax.driver.core.Session$Manager.executeQuery(Session.java:495) [cassandra-driver-core-1.0.5.jar:]
        at com.datastax.driver.core.Session.executeAsync(Session.java:156) [cassandra-driver-core-1.0.5.jar:]
        at org.rhq.server.metrics.StorageSession.executeAsync(StorageSession.java:181) [rhq-server-metrics-4.12.0.jar:4.12.0]
        at org.rhq.server.metrics.MetricsDAO.updateIndex(MetricsDAO.java:244) [rhq-server-metrics-4.12.0.jar:4.12.0]
        at org.rhq.server.metrics.MetricsServer.addNumericData(MetricsServer.java:473) [rhq-server-metrics-4.12.0.jar:4.12.0]

Fix is in 1.0.6 release.

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