Java qpid-client ignores hostnames containing underscores

When defining a connection URL listing a broker that has an underscore the hostname results in the broker host being evaluated to "localhost" rather than the intended host.

e.g. amqp://guest:guest@clientid/test?brokerlist='tcp://under_score:5672'
amqp://guest:guest@clientid/test?brokerlist='tcp://under_score'