UTF-8 encoding problem

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Java

UTF-8

springboot

Hi there, Now I have prepared validation processes by writing rest api. And I prepared a resource-bundle operation for each validation operation. However, when I send a query in the postman, some UTF-8 characters that I added in the resource-bundle are not read. It looks like this. The letters I use here are from the Azerbaijani language.The text I want to show here is "no such Employee id found". Even when I look at the resource-bundl, Intellij itself gives such a warning on utf-8-e characters. What can I do to make UTF-8 letters appear normally?

Unsupported characters for the charset 'ISO-8859-1

{
    "code": 404,
    "message": "\"Bel? id-d? i?�i tap?lmad?."
}

What I have tried:

In some places they told me to download higher level from jdk 8 but it didn't help.