Why am I getting "Entity class must be annotated with @Entity" error and how can I ignore it?

Question

I have a Lombok-annotated POJO that I'm using for other parts of the app and is not intended for Room. But when I try to build my project I get the Entity class must be annotated with @Entity error about it and the build fails.

I know I could just force one of my actual Room entities to fill this data object's role by adding a bunch of @Ignored fields, but that seems dumb. How can I tell it that this class is not an entity and that Room should leave it alone?

This is the class it complains about:

import androidx.annotation.DrawableRes;

import lombok.Builder;
import lombok.Value;

@Value
@Builder
public class MyPOJO {
    final String matchQuality;
    final String identifier;
    final String fitDate;
    @DrawableRes
    final int image;
}

Note: This happens even if I remove the Lombok annotations and include manual implementations of the constructor, getters/setters, etc — Reagankm
– Reagankm, Commented Feb 26, 2020 at 18:23

Reagankm · Accepted Answer · 2020-02-26 19:02:00Z

1

This was my bad.

When I was just starting with my implementation and hadn't made any entities, I needed something to go in the Database entities annotation and put MyPOJO there as a placeholder:

@Database(entities = {MyPOJO.class}, version = 1)
abstract public class MyDB extends RoomDatabase {

Once I replaced this with my actual @Entity classes, I no longer get this build error.

answered Feb 26, 2020 at 19:02

Reagankm

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