Seems there are still Illegal Reflective Access warnings in jackson-datatype-jsr310:2.10.1 LocalDate with JDK 11.0.5.
Here is what is reported when LocalDate is tried to be serialized:
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.fasterxml.jackson.databind.util.ClassUtil (file:/C:/Users/mcekovic/.gradle/caches/modules-2/files-2.1/com.fasterxml.jackson.core/jackson-databind/2.10.1/18eee15ffc662d27538d5b6ee84e4c92c0a9d03e/jackson-databind-2.10.1.jar) to field java.time.LocalDate.year
WARNING: Please consider reporting this to the maintainers of com.fasterxml.jackson.databind.util.ClassUtil
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release