我正在将Spring-boot REST API应用程序中的某些模型转换为使用Java 8
java.time.LocalDateTime而不是joda的模型DateTime。我希望从API调用返回的时间戳遵循该ISO_8601格式。动机是要与Java8的时间向前兼容

事实证明，困难的部分是序列化包含LocalDateTimeJSON 的对象。

例如，我有以下实体：

// ... misc imports

import java.time.LocalDateTime;
import java.time.ZoneOffset;

@Data 
@Entity
@Table(name = "users")
public class User {

    @Id @Column
    private String id;

    @Column
    private String name;

    @Column
    private String email;

    @Column
    @JsonFormat(pattern = "yyyy-MM-dd'T'HH:mm:ss", timezone = "UTC")
    private java.time.LocalDateTime createdAt;

    public User(String name, String email) {
        this.id = Utils.generateUUID();
        this.createdAt = LocalDateTime.now(ZoneOffset.UTC);
    }
}

我还设置了application.properties关闭日期作为时间戳杰克逊功能：

spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS = false

我的行家部门：

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <version>1.3.6.RELEASE</version>
</dependency>

<dependency>
    <groupId>com.fasterxml.jackson.datatype</groupId>
    <artifactId>jackson-datatype-jsr310</artifactId>
    <version>2.8.1</version>
</dependency>

<dependency>
     <groupId>org.hibernate</groupId>
     <artifactId>hibernate-core</artifactId>
     <version>5.0.1.Final</version>
 </dependency>

最后，我尝试通过控制器检索JSON表示形式：

@RequestMapping("/users")
@RestController
public class UserController {

    private UserService userService;

    @Autowired
    public UserController(UserService userService) {
        this.userService = userService;
    }

    @RequestMapping(
        value = "/{id}",
        method = RequestMethod.GET,
        produces = MediaType.APPLICATION_JSON_UTF8_VALUE
    )
    public User getUser(@PathVariable("id") String id) {
        return userService.findById(id);
    }
}

当我实际调用此端点时，出现以下异常：

java.lang.NoSuchMethodError: 
com.fasterxml.jackson.datatype.jsr310.ser.JSR310FormattedSerializerBase.findFormatOverrides(Lcom/fasterxml/jackson/databind/SerializerProvider;Lcom/fasterxml/jackson/databind/BeanProperty;Ljava/lang/Class;)Lcom/fasterxml/jackson/annotation/JsonFormat$Value;

另外，我还在ObjectMapper配置类中配置了应用程序：

@Configuration
public class ServiceConfiguration {

    @Bean
    public ObjectMapper getJacksonObjectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.registerModule(new JavaTimeModule());
        objectMapper.configure(
            com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS,
            false
        );
        return objectMapper;
    }
}

任何线索将不胜感激。

更新：

事实证明，这是Spring
Boot的Jackson版本与我的版本中的版本不匹配pom.xml。正如Miloš和Andy所建议的那样，一旦我设置了正确的版本并使用运行应用程序spring.jackson.serialization.write_dates_as_timestamps=true，问题就解决了，而无需ObjectMapper在LocalDateTime模型字段上配置或添加注释。

    ...
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>1.3.6.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>1.3.6.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
        </dependency>

    </dependencies>