Receiving JSON in the request body and turning that into java is possible, but not as easy as it should be. Specially when compared to other more modern languages (such as Ruby on Rails), java lacks some flexibilities which are sought for when manipulating schemaless external input.

1. RESTMODEL,
A HASHMAP ON STEROIDS
SIMPLIFY REST INPUT IN JAVA WITH
open source powered by

2. http://www.aiqudo.com/
voice to action
https://github.com/bxfsh

3. JSON TO JAVA
THE PROBLEM

4. THE PROBLEM: “JSON” TO “JAVA"
TWO VERY DIFFERENT WORLDS

5. THE PROBLEM: “JSON” TO “JAVA"
SOLUTION 1: SPRING (REST + JPA) 101

6. THE PROBLEM: “JSON” TO “JAVA"
SOLUTION 1: SPRING (REST + JPA) 101

7. THE PROBLEM: “JSON” TO “JAVA"
SOLUTION 1: SPRING (REST + JPA) 101

8. THE PROBLEM: “JSON” TO “JAVA"
SOLUTION 1: SPRING (REST + JPA) 101
HOW HOMAKOV HACKED GITHUB AND THE LINE OF CODE THAT COULD HAVE PREVENTED IT
HTTPS://GIST.GITHUB.COM/PETERNIXEY/1978249

9. THE PROBLEM: “JSON” TO “JAVA"
SOLUTION 1: SPRING (REST + JPA) 101
WE NEED TO SANITISE THE DATA
BEFORE WE SAVE IT!

10. ALTERNATIVES
MAPPING SON TO JAVA

11. THE PROBLEM: “JSON” TO “JAVA"
SOLUTION 1: MAP<STRING, OBJECT>

12. THE PROBLEM: “JSON” TO “JAVA"
SOLUTION 1: MAP<STRING, OBJECT>

13. THE PROBLEM: “JSON” TO “JAVA"
SOLUTION 2: AUTO MAPPER

14. THE PROBLEM: “JSON” TO “JAVA"
SOLUTION 2: AUTO MAPPER

15. REST MODEL
MAPPING SON TO JAVA

16. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL

17. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL
Good JSON-Serialisable error object
Chained instruction for setup
Cast-free conversions

18. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL permit(key) + baseline(key)

19. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL permit(key) + baseline(key)
Defaults “name" to "defaultName"
Uses whatever provided in the request body,
and uses the baseline if nothing was provided

20. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL permit(key) + has(key)

21. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL permit(key) + has(key)
has(key) checks against “blank”, not just null or empty

22. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL permitAll()

23. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL permitAll()
do no filter information, if you don’t want

24. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL nested validation

25. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL nested validation
Validation can be performed equally in child objects

26. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL easy cast to many types and lists

27. THE PROBLEM: “JSON” TO “JAVA"
THE REST MODEL easy cast to many types and lists
Loads can be done with it.

28. RestModel
FEATURES & ADVANTAGES
▸ JSON keys normalisation (both
camelCase and snake_case
work)
▸ Simple linguistics to scrutinise
and validate input
▸ Also works with Lists and
Nested objects in the same way
▸ When validation errors are
found, provides good JSON
Serialisable Errors object
▸ It’s dependency free!
▸ Cast-free conversion of values
to (almost) all basic types.
▸ Fluent API for chained
instructions
▸ Used in production for 1 year,
1.4 released recently

29. RestModel
WANT TO HELP?
▸ It’s currently not possible to
extend the converters. We have it
to (almost all) basic types, but
registering your own ain’t possible
▸ Desired, but no way to
simply .bindTo(Entity.class) using
the require/permit rule
HTTPS://GITHUB.COM/BXFSH/BOXFISH-COMMONS-WEB-MODEL

30. RestModel
WANT TO HELP?
▸ It’s currently not possible to
extend the converters. We have it
to (almost all) basic types, but
registering your own ain’t possible
▸ Desired, but no way to
simply .bindTo(Entity.class) using
the require/permit rule
HTTPS://GITHUB.COM/BXFSH/BOXFISH-COMMONS-WEB-MODEL
MAY SOON BE RENAMED TO AIQUDO

31. TIME FOR Q&A
// HUDSON MENDES
github.com/hudsonmendes
twitter.com/hudsonmendes
medium.com/@hudsonmendes
linkedin.com/in/hudsonmendes

32. THANKS!
// HUDSON MENDES