<@U0ZFBBUBU>: the problem was caused by Spring’s `...

# announcements

[dstarcev]

@groostav: the problem was caused by Spring’s DefaultJackson2JavaTypeMapper. It somehow used different classloader internally. I think class MessageDTO was loaded twice and that was the reason why types didn’t match. However, when I converted the code of DefaultJackson2JavaTypeMapper to Kotlin and substituted the original class with the rewritten one, everything started working fine. 🤔