[FIXED] How to force variable to be public kotlin

Issue

i have the following code:

@Entity
@Table(name = "`users`")
class User(
    var name: String,
    var avatar: ByteArray
) {
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    var id: Long = -1


    fun getAvatarAsImage(): BufferedImage? {
        val img: InputStream = ByteArrayInputStream(avatar)
        return ImageIO.read(img)
    }

    fun setAvatarAsImage(img: BufferedImage) {
        val out = ByteArrayOutputStream()
        ImageIO.write(img, "PNG", out)
        avatar = out.toByteArray()
    }

}

but hibernate says that id is private (thats because kotlin auto-generating getters and setters), so compiled to java it seems like:

@Id
@GeneratedValue(
   strategy = GenerationType.AUTO
)
private long id;

public long getId() {
   return this.id;
}

public void setId(long var1) {
   this.id = var1;
}

QUESTION: how to make it compiled like:

@Id
@GeneratedValue(
   strategy = GenerationType.AUTO
)
public long id;

???

idk what is this....

Solution

I'm not sure you have interpreted the error message from Hibernate properly, as the @Id-annotation seems correct. But I'm wondering if you perhaps forgot to use the kotlin-jpa compiler plugin that helps creating Hibernate-friendly classes?

Read more here: https://kotlinlang.org/docs/no-arg-plugin.html#jpa-support

Maybe you can try putting the annotations on the getter instead to force Hibernate to use property-based access... Try modifying the annotations to:

@get:Id
@get:GeneratedValue(strategy = GenerationType.AUTO)
var id: Long = -1

... or even worst case expose the field as public (as you are asking for) with...

@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@JvmField
var id: Long = -1

Answered By - Per Huss
Answer Checked By - Gilberto Lyons (JavaFixing Admin)