MRSimplerBatchPublisher will throw a NullPointerException when it tries to do any logging because the fLog object is null.

The fLog should have been set in the super constructor (in MRBaseClient), but the version of the super constructor called by the MRSimplerBatchPublisher class:

    protected MRBaseClient ( Collection<String> hosts ) throws MalformedURLException

does not set the fLog object. However, the other two versions of the constructor does.

Suggested fix is to set the fLog object for all constructors of the MRBaseClient class.