@JsonFormat Annotation for field of Type java.time.Instant are Ignored

[FlorianKaemmerer]

I'm having trouble generating a correct swagger file from an Object that contains fields of type java.time.Instant.

Example Object:

public class GenerationStatus {

    @JsonProperty
    @JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ssZ", timezone = "Europe/Berlin")
    private Instant generationDate;

Snipped of generated swagger.yaml

definitions:
  ReportGenerationStatus:
    type: "object"
    properties:
      generationDate:
        type: "integer"
        format: "int64"

I would expect something like:

definitions:
  ReportGenerationStatus:
    type: "object"
    properties:
      generationDate:
        type: "string"
        format: "date-time"

My Plugin configuration is as follows:

<plugin>
                <groupId>com.github.kongchen</groupId>
                <artifactId>swagger-maven-plugin</artifactId>
                <version>${swagger-maven-plugin.version}</version>
                <configuration>
                    <apiSources>
                        <apiSource>
                            <springmvc>true</springmvc>
                            <locations>example.com.controller</locations>
                            <schemes>https</schemes>
                            <host>localhost:8080</host>
                            <basePath>/v2/api-docs</basePath>
                            <info>
                                <title>Generation Status API</title>
                                <version>v1</version>
                                <description>This API gives the status of the generation.</description>
                            </info>
                            <swaggerDirectory>${swagger-documentation-directory}</swaggerDirectory>
                            <swaggerFileName>swagger</swaggerFileName>
                            <outputFormats>yaml</outputFormats>
                        </apiSource>
                    </apiSources>
                </configuration>
                <executions>
                    <execution>
                        <phase>compile</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>

Am I missing something?