Is there a translation that means something similar as it does in English?
In my case I need that this was in the Informatic Sciences field, you can see the expression in this book: Java in a Nutshell
There are two phrases that come to my mind to translate "In a nutshell":
I think the second one can be used better for your example, in the following form:
Compendio de Java
See here the definition in RAE for "Compendio":
Del lat. compendium.
m. Breve y sumaria exposición, oral o escrita, de lo más sustancial de una materia ya expuesta latamente.
m. El Salv. complicación (‖ dificultad).
- loc. adv. p. us. en sustancia (‖ en resumen).
Like always, idiomatic expressions cannot be translated directly and saying "Java en una cáscara de nuez" wouldn't make any sense. Instead, we have to go to the meaning of it and try to find some equivalents.
Since the expression refers to "knowledge to be gained through a not very long set of information", these are the expressions that I would use in Spanish: