[Java] Set the json library as a parameter

[cbornet]

Almost all java client implementations can support both Jackson and Gson as json library. So it would be useful to be able to choose the json lib with a parameter.
This would also avoid duplication of the gson model.mustache in all libs that use it.

[wing328]

Totally agree.

This would allow developers to choose any combination of HTTP library (jersey1.x, jersey2.x, Retrofit 1.x, Retrofit 2.x and more) and JSON library (gson or Jackson)

[konopski]

How about using an abstraction layer over json library?
Like https://github.com/VictorAlbertos/Jolyglot or https://github.com/rhkiswani/JavaFF ?

[wing328]

@konopski yup, that's one way to do it.

For PHP, we use https://github.com/php-http/httplug to allow developers choose their favorite HTTP libraries.

[cbornet]

I wouldn't use not well known libraries. I think that we can have templates that support multiple libraries : it's only about flagging some annotations.