What is the structure of a fatjar, if any?

[Harald Kirsch]

Hi all,

I need to add dependent jars to my topology. With 'storm jar', the jar 
file shall contain all dependencies, but I miss information on how the 
jar must be structured. I only find references to maven plugins or 
gradle magic or leiningen whatever, none of which technologies I am using.

Could some kind soul just briefly describe how the jar needs to be 
structured:

1) Unpack all dependent jars and repack them into one jar. Is that what 
fatjar refers to?

2) Just add the dependent jars as jars and they are unpacked for use 
with the topology?

Thanks,
Harald.