Spring converts attribute name to lowercase in JSON serialization

Question

I have this nested class

data class UI(
val xPosition: Int,
val yPosition: Int
)

When the Object gets serialized through the @RestController I receive all lowercase on the HTTP endpoint (last line is the interesting one):

{"id":"c8a7b735-b407-4dae-9a41-a470f7596895",
"isActive":false,
"title":"First Sample",
"description":{"shortDescription":"...","longDescription":"...","additionalNotes":"..."},
"endDate":"2021-01-07","priority":0,
"ui":{"xposition":0,"yposition":0}}]   <<<<<< see here

I copy the data into a MongoDB document. There it correctly states

ui:
xPosition: 0
yPosition: 0

What is going on here? I cannot get the Spring RestController to return the second letter as uppercase. This destroys the consumption and update of the data in the attached UI :(

@nykon Hi, have you found any solution to the above problem? — Raj Khot, Apr 11 '22 at 06:37
Duplicate of https://stackoverflow.com/questions/30205006/why-does-jackson-2-not-recognize-the-first-capital-letter-if-the-leading-camel-c — Aybek Kokanbekov, Sep 11 '22 at 16:23

score 2 · Answer 1 · edited Mar 05 '23 at 18:17

2

For Java restrictions, the first 2 letters of a Json must be lowercase; I guess the only solution is to work with your variables as:

val xposition: Int,
val yposition: Int

edited Mar 05 '23 at 18:17

Adrian Mole

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answered Mar 02 '23 at 07:13

Jose Andres Flores Saavedra

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Spring converts attribute name to lowercase in JSON serialization

1 Answers1