“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

I had initially followed the method used in Kotlin, but that gives the error in Java code. Two quick changes fixed it for me

• Change BaseDao to Abstract class
• Added @Dao annotation to the BaseDao

Please find the code below and now it runs properly

@Dao
abstract class BaseDao {

   @Insert(onConflict = OnConflictStrategy.REPLACE)
   abstract void insert(T entity);

   @Update
   abstract void update(T entity);

   @Delete
   abstract void delete(T entity);
 }

 @Dao
 public abstract class ReasonDao extends BaseDao{

    @Query("SELECT * from Reason")
    abstract public List getReasons();

  }