Hey! This is my entity code in kotlin/springboot ...

# spring

[Sheheryar Umair]

Hey! This is my entity code in kotlin/springboot

@Entity
@Table(name = "\"User\"")
class User(
    @Id
    @Column(nullable = false, updatable = false)
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    val id: Int,

    @Column(nullable = false)
    val name: String,

    @Column(nullable = false)
    val email: String,

    @Column(nullable = false)
    val password: String,

    @Column(nullable = false)
    val mobile: String,

    @Column(nullable = false)
    val role: String,

    @Column(nullable = false)
    val companyName: String,

    @Column(nullable = false)
    val address: String,

    @Column(nullable = false)
    val billingAddress: String,

    @Column
    val isDeleted: LocalDateTime,
)

The error I am getting is org.hibernate.InstantiationException: No default constructor for entity . Can someone assist me to solve this.

[Emil Kantis]

apply the kotlin spring boot plugin

[Sheheryar Umair]

this one?

plugins {
    id("org.jetbrains.kotlin.plugin.allopen") version "1.9.22"
}

[Emil Kantis]

kotlin("plugin.spring") version "1.9.22"

[Emil Kantis]

If you add that one, you can remove allOpen, it's added automatically by the spring plugin

[Sheheryar Umair]

Thank you for your response!!

[Szymon Jeziorski]

plugin.spring would just open classes annotated with Spring bean annotations @Component, @Service etc, it will not help you with this particlar issue.
To ensure default empty constructor is generated for JPA entities you would need to use plugin.jpa.

Take a look at this guide:
https://spring.io/guides/tutorials/spring-boot-kotlin/

also, don't skip Persistence with JPA part, as opening JPA classes is needed for lazy fetching to work properly

[Sheheryar Umair]

Sure, taking look now

[Sheheryar Umair]

Adding this _kotlin_("plugin.jpa") _version_ "1.9.22" has solved the error. Thank you!

[Emil Kantis]

Sorry, mixed them up 🙂

[Emil Kantis]

Spring wraps allOpen, JPA wraps noArg..

[kqr]

val id is working?

[Sheheryar Umair]

yes it is working