Persist time with hibernate and java

Question

(Spring app - MVC) I defined a table with the column:

`time` TIME NOT NULL,

In the entity class I have:

@Getter @Setter
@NotNull
private java.sql.Time time;

In my DTO class, I have:

@Getter @Setter
private java.sql.Time time;

When I send "time": "12:10" from postman I get: com.fasterxml.jackson.databind.JsonMappingException: Instantiation of [simple type, class java.sql.Time] value failed: null (through reference chain: (<points to a field (of java.sql.Time) in my aforementioned DTO class>))

When I have TIMESTAMP in MySQL, java LocalTime in both dto and entity, then it works but it persists both time and date. I would like to have time only.

I walked through different previous topics fe Joda-Time-Hibernate so I used LocalTime (in both dto and entity) with annotation @Type(type="org.joda.time.contrib.hibernate.PersistentLocalTimeAsTime") but it didn't work.

Could someone help me, what are the right types (time only) for dto, entity, table's column, so jackson can serialize, hibernate understand and persist.

Answer 1

As for serialization, you have to add this to your application.properties

spring.jackson.serialization.WRITE_DATES_AS_TIMESTAMPS = false

this way you will allow simple date form mapping (Java8 requirement)

What I am using to store LocatDate as birthday

Dependecy:

compile('org.hibernate:hibernate-java8:5.0.12.Final')

In entity class

@Column
private LocalDate birthday;

No additional configuration required. What do I get in the database:

and the birthday is of type date

To have date and time I use Instant

@Data
@MappedSuperclass
public abstract class TimestampedEntity extends AbstractEntity {

    @Column(updatable = false)
    @Setter(value = AccessLevel.PRIVATE)
    private Instant createdAt;

    @Column
    @Setter(value = AccessLevel.PRIVATE)
    private Instant modifiedAt;

    @PrePersist
    private void beforeCreation() {
        this.setCreatedAt(Instant.now());
    }

    @PreUpdate
    private void beforeUpdate() {
        this.setModifiedAt(Instant.now());
    }

}

and this persists as Timestamp in database.

PS. I am using Spring+JPA+Hibernate+MySQL