Configure LocaldateTime in Spring Rest API

Question

I use Java 10 with latest Spring spring-boot-starter-parent 2.1.0.RELEASE

POM configuration:

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
    </parent>

    <dependencies>          
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-xml</artifactId>
            <version>2.9.7</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.7</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.module</groupId>
            <artifactId>jackson-module-jaxb-annotations</artifactId>
            <version>2.9.7</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.jaxrs</groupId>
            <artifactId>jackson-jaxrs-json-provider</artifactId>
            <version>2.9.7</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.6</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.woodstox</groupId>
            <artifactId>woodstox-core-asl</artifactId>
            <version>4.4.1</version>
        </dependency>
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.3.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-core</artifactId>
            <version>2.3.0.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <version>2.3.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mapstruct</groupId>
            <artifactId>mapstruct-jdk8</artifactId>
            <version>1.2.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.jxls</groupId>
            <artifactId>jxls-poi</artifactId>
            <version>1.0.15</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>8.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.security.oauth</groupId>
            <artifactId>spring-security-oauth2</artifactId>
            <version>2.3.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.security.oauth.boot</groupId>
            <artifactId>spring-security-oauth2-autoconfigure</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.session</groupId>
            <artifactId>spring-session-core</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
    </dependencies>

Rest Endpoint:

    @GetMapping("{id}")
    public ResponseEntity<?> get(@PathVariable String id) {
        return transactionRepository
                .findById(Integer.parseInt(id))
                .map(mapper::toDTO)
                .map(ResponseEntity::ok)
                .orElseGet(() -> notFound().build());
    }

DTO:

public class PaymentTransactionsDTO {

    private Integer id;

    private String status;

    private LocalDateTime created_at;

    private String merchant;
    .... getters and setters
}

But when I try to return JSON data for LocalDateTime created_at I get empty result. I suppose that LocalDateTime is not properly converted into JSON value.

Can you advice how I can fix this issue?

You need to add converter and register in spring eg. https://www.baeldung.com/spring-mvc-custom-data-binder — Vipul Pandey, Nov 21 '18 at 07:47

Peter Walser · Answer 1 · 2019-03-12T15:13:44.097

JSON serialization is driven by Jackson's ObjectMapper, which I recommend configuring explicitely. For proper serialization of the Java 8 date and time objects, make sure to

register the JavaTimeModule
disable writing dates as timestamps
setting the date format (use StdDateFormat)

Description of StdDateFormat:

Default DateFormat implementation used by standard Date serializers and deserializers. For serialization defaults to using an ISO-8601 compliant format (format String "yyyy-MM-dd'T'HH:mm:ss.SSSZ") and for deserialization, both ISO-8601 and RFC-1123.

Recommended configuration:

@Configuration
public class JacksonConfig {

    @Bean
    public ObjectMapper objectMapper() {
        return new ObjectMapper()
            .setAnnotationIntrospector(new JacksonAnnotationIntrospector())
            .registerModule(new JavaTimeModule())
            .setDateFormat(new StdDateFormat())
            .disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    }

} }

Examples of serialized date and time objects:

LocalDate: 2018-11-21
LocalTime: 11:13:13.274
LocalDateTime: 2018-11-21T11:13:13.274
ZonedDateTime: 2018-11-21T11:13:13.274+01:00

Edit: standalone dependencies (already included transitively in spring-boot-starter-web):

com.fasterxml.jackson.core:jackson-annotations
com.fasterxml.jackson.core:jackson-databind
com.fasterxml.jackson.datatype:jackson-datatype-jsr310

What do you mean by `register the JavaTimeModule`? Add maven dependency? — user1285928, Nov 21 '18 at 10:28
It means the line `mapper.registerModule(new JavaTimeModule());`. I edited the post to list the explicit jackson modules required, however they are already included in `spring-boot-starter-web`. — Peter Walser, Nov 21 '18 at 11:23

score 4 · Answer 2 · answered Nov 19 '18 at 05:26

4

Try using @JsonFormat on your created_at field.

@JsonFormat(pattern="yyyy-MM-dd")
@DateTimeFormat(iso = DateTimeFormat.ISO.TIME)
private LocalDateTime created_at;

answered Nov 19 '18 at 05:26

Pooja Aggarwal

1,125
5
14

No, it's not fixing the issue. – user1285928 Nov 19 '18 at 11:25
Probably I'm applying this annotation on DTO not in JPA Entity? – user1285928 Nov 20 '18 at 19:17
You need to apply it on DTO only. You can use a workaround by taking string instead of local date time and convert your local date time into string. This is not the best approach but may be helpful. – Pooja Aggarwal Nov 21 '18 at 01:37
Also you can try solutions from https://stackoverflow.com/questions/28802544/java-8-localdate-jackson-format – Pooja Aggarwal Nov 21 '18 at 01:39

score 1 · Answer 3 · answered Nov 21 '18 at 09:52

1

You need to add converter and register in spring eg. baeldung.com/spring-mvc-custom-data-binder

answered Nov 21 '18 at 09:52

Vipul Pandey

1,201
10
19

score 1 · Answer 4 · answered Nov 21 '18 at 10:13

You can type your PaymentTransactionsDTO "created_at" attribute as a String and use a converter to convert the String to LocalDate (type of the attribute created_at of your entity "PaymentTransactions")

@Component
public class PaymentTransactionsConverter implements Converter<PaymentTransactionsDTO, PaymentTransactions> {

    @Override
    public PaymentTransactions convert(PaymentTransactionsDTO paymentTransactionsDTO) {

        PaymentTransactions paymentTransactions = new PaymentTransactions();
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");

        ...

        paymentTransactions.setCreated_at(LocalDate.parse(paymentTransactionsDTO.getCreated_at(), formatter));

        return paymentTransactions;
    }
}

Configure LocaldateTime in Spring Rest API

4 Answers4

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