“Type of the parameter must be a class annotated with @Entity” while creating Generic DAO interface in Room

Question

I am using Room architecture component for persistence. I have created generic DAO interface to avoid boilerplate code. Room Pro Tips

But my code doesn\'t compile s

Answer 1

The reason is that you specified ReasonDao type as generic parameter instead of Reason.

Original code:

@Dao
public abstract class ReasonDao implements BaseDao {

   ...

}

Correct code:

@Dao
public abstract class ReasonDao implements BaseDao {

   ...

}

where Reason is the type marked with @Entity annotation.

By the way, this is fixed in the accepted answer, but is not mentioned in the changelist :)