Github user wilderrodrigues commented on the pull request: https://github.com/apache/cloudstack/pull/761#issuecomment-136318482 It has been partially fixed on 4.6, but still the code can be improved since it might return null. Below an snippet of the 4.6 code: @Override public boolean isVmAlive(com.cloud.vm.VirtualMachine vm, Host host) throws UnknownVM { Status status = isAgentAlive(host); if (status == null) { throw new UnknownVM(); } return status == Status.Up ? true : null; } As you can see, they now throw an Exception in canse the status is null. However, in the return it might return null. In addition, the return type is no longer a wrapper class, but a native boolean. Returning null would be very bad. Could you perhaps make an amalgama of the fix, @remibergsma ? You can then push it towards 4.4 and 4.6 Cheers, Wilder
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