How to make data class in Kotlin immutable with java Date object in it?

Question

Itself java.util.Dateis a mutable object. Thus, even if the Kotlin data class (with val date declaration) does not allow me to change the link, I can change the date object itself to change its value.

Ways I could come up with:

Use normal class, override getter and setter. In each case, use the clone method to create a copy of the given date.

    @Column(name = "db_date")
    private var dbDate: Date? = null
    get() = dbDate?.clone() as Date
    set(date) {
        field = date?.clone() as Date
    }

Also, I cannot use the copydata class method , since these classes are sleeping entities. So I need to change them through the setters.

The reason I want to use data classes for my objects is because by default they implement equalsand hashcode. We used lombok in java for this, and now a convincing command to create these methods is complicated. Even if the generation is done using the IDE, it will still be checked for source control.

So that I can make user settings in the logic of the data class. Or in any way, can I generate equal and hash codes for regular classes without checking them in the source control?

: java.time.Instant, . , , , Hibernate Entity Class, hibernate 3.6. 5.2, , . , , , kotlin -. :

@Entity
@Table(name = "my_table")
data class MyTable(
    @Id
    @Column(name = "id")
    var id: Long? = null,


    @Column(name = "my_date")
    private var date: Date? = null,


) {
    fun getDate():Date = gradedDate?.clone() as Date
    fun setDate(date: Date?) {
        this.date = date?.clone() as Date
    }
}