I use Spring Boot and included jackson-datatype-jsr310 with Maven:
jackson-datatype-jsr310
com.fasterxml.jackson.datatype
Like I put in the comment, you could also use this solution in the signature method: @RequestParam @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME) LocalDateTime start
@RequestParam @DateTimeFormat(iso = DateTimeFormat.ISO.DATE_TIME) LocalDateTime start