👀 Views: 56 💬 Answers: 1 📅 Created: 2025-06-08

spring-boot jackson localdatetime Java

I recently switched to I'm upgrading from an older version and I'm working with an scenario with deserializing LocalDateTime fields when using Spring Boot 2.6.4 and Jackson 2.12.3. My JSON input has timestamps in ISO-8601 format, but they are not being parsed correctly into LocalDateTime objects, resulting in a `com.fasterxml.jackson.databind.exc.InvalidFormatException`. The behavior message indicates that the input string does not match the format expected by the LocalDateTime parser. Here’s a snippet of the code I'm using: ```java import com.fasterxml.jackson.annotation.JsonFormat; import java.time.LocalDateTime; public class Event { @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSS") private LocalDateTime eventTime; // Getters and Setters } ``` The JSON I'm trying to deserialize looks like this: ```json { "eventTime": "2023-10-01T10:15:30.000" } ``` However, when I run the application, I get the following exception: ``` com.fasterxml.jackson.databind.exc.InvalidFormatException: want to parse "2023-10-01T10:15:30.000": not a valid representation (behavior: Failed to parse Date value '2023-10-01T10:15:30.000') ``` I've tried various patterns in the `@JsonFormat` annotation, including omitting the milliseconds portion and using just `yyyy-MM-dd'T'HH:mm:ss`, but the behavior continues. I also verified that my Jackson version is compatible with LocalDateTime, and I added the necessary modules, like `jackson-datatype-jsr310`, to my Spring Boot configuration: ```java import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class JacksonConfig { @Bean public ObjectMapper objectMapper() { ObjectMapper mapper = new ObjectMapper(); mapper.registerModule(new JavaTimeModule()); return mapper; } } ``` Despite these efforts, I still encounter the same deserialization scenario. Any insights on how to correctly configure Jackson to handle LocalDateTime would be greatly appreciated. For context: I'm using Java on macOS. What am I doing wrong? I'm working in a macOS environment. Am I missing something obvious?