Android Room insertAll issues

The calls done by Room are not synchronous so probably when you perform

List<Order> myOrders = mDb.getOrderDao().getAll()

it is still inserting the orders.

Try this

@Dao public interface OrderDao {     @Insert(onConflict = OnConflictStrategy.REPLACE)     public long insertOrder(Order order);     @Insert(onConflict = OnConflictStrategy.REPLACE)     void insertAllOrders(List<Order> order);     @Query("SELECT * FROM orders")     List<Order> getAll();  }@Entity(tableName = TABLE_NAME) public class Order {    public static final String TABLE_NAME = "orders";    @PrimaryKey (autoGenerate = true)   private int id;    @SerializedName("order_number")    @ColumnInfo(name = "order_number")    private String orderNumber; } // Call mDb.getOrderDao().insertAllOrders(orders);Log.d(TAG, "inserted all");Executor executor = Executors.newSingleThreadExecutor();executor.execute(new Runnable() {        @Override        public void run() {             List<Order> myOrders = mDb.getOrderDao().getAll();             Log.d(TAG, "Orders nr = " + myOrders.size());         }});

OnConflict Property must be added.

@Insert(onConflict = OnConflictStrategy.REPLACE)