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kotlinlang

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hi, I am using Spring Data JPA and creating some entities. I have the kotlin jpa plugin installed in Gradle so it should be making no-arg constructors for my entities. But I still get the error below in IntelliJ. Is there a project setting I need to change so IntelliJ recognizes I'm using the kotlin jpa plugin?

Few tips:
• do not use `data class`, use `class` instead (generated equals/hashCode are not really suitable for JPA, it's always the best to define them yourself)
• id must be nullable as well as `var` , also you can make it a class property, rather than constructor parameter (there is no point in making it class-level parameter)

<@UE0E6UWAJ> Do all the JPA properties in the class that map to collumns have to be var's?

Everything, except `@Id`  annotation (and few others, like `@CreatedBy`), is managed by end user, so this decision is all yours.
If data definitely immutable, then you can use `val`(which is a rare case, if you think about it), otherwise `var` .