Akka implementation, provides one reference.conf file per jar file.

In normal operation, the loaders are traversed, and the reference.conf 
files are merged together by akka. 

But when using the Maven shade plugin, the contents of all the jar files
are merged together into a single aggregate. 

As a result, only one reference.conf remains, the rest are thrown away, 
the result - failure. 

The trick is to use the AppendingTransformer to merge all these files into 
a reference.conf file. 

This maven snippet demonstrates how.