kinnerapriyap

@Entity(primaryKeys = {"categoryId","itemID"})
data class Item {
  ...
}

kinnerapriyap

@Entity
public class Item {
    @EmbeddedId ItemId id;
     ...
}

@Embeddable
class ItemId {
    long categoryId;
    int itemId;

kinnerapriyap

data class Address(
    val addressLine1: String,
    val addressLine2: String,
    val city: String,
    val country: String,
    val pincode: Int
)

kinnerapriyap

@Entity
data class Person(
    @PrimaryKey(autoGenerate = true)
    val id: Long,
    @SerializedName("name")
    val personName: String,
    val addressLine1: String,
    val addressLine2: String,
    val city: String,
    val country: String,

kinnerapriyap

data class Person(
    val id: Long,
    val name: String,
    val addressLine1: String,
    val addressLine2: String,
    val city: String,
    val country: String,
    val pincode: Int,
    val phoneNumber: String
)