A modern programming language that makes developers happier.

kotlinlang

anybody with a hint on

```
java.lang.UnsupportedOperationException: Kotlin class Masterplan has no .copy(…) method for property id!
	at org.springframework.data.mapping.model.BeanWrapper$KotlinCopyUtil.setProperty(BeanWrapper.java:181) ~[spring-data-commons-2.1.2.RELEASE.jar:2.1.2.RELEASE]
```

```
data class Masterplan(
	@Id val id: Int? = null,
	val description: Description,
	val fileUid: FileUid,
	val creator: Creator,
	val projectUid: ProjectUid
)
```

probably I am missing some annotation :disappointed: