error: Type of the parameter must be a class annotated with @Entity or a collection/array of it

Question

I have looked at other posts regarding the same, but i don't follow what mistake i must be doing. I have the same name declared in Entity for the class as well as in Database declaration file too. I'm also passing the same type of parameter as the entity class name, and still i'm getting this error thrown and it is not compiling. Here's my code. TIA

 @Entity(tableName = "current_task_table")
  data class CurrentTask (
    @PrimaryKey(autoGenerate = true) val uid: Int,
    @ColumnInfo(name = "task_name") val taskName: String
)

@Dao
interface CurrentTaskDao {

    @Query("SELECT * FROM current_task_table")
    fun getAllCurrentTask(): LiveData<List<CurrentTask>>

    @Insert
    suspend fun insertCurrentTask(currentTask: CurrentTask)

    @Query("DELETE FROM current_task_table")
    fun deleteAllCurrentTasks()
}

@Database(entities = [CurrentTask::class], version = 1, exportSchema = false)
abstract class AppDatabase : RoomDatabase() {

    abstract val currentTaskDao: CurrentTaskDao

    companion object {

        @Volatile
        private var instance: AppDatabase? = null

        fun getInstance(context: Context): AppDatabase? {
            if (instance == null) {
                synchronized(this) {
                    instance = Room.databaseBuilder(
                        context.applicationContext,
                        AppDatabase::class.java, "app_database"
                    )
                        .fallbackToDestructiveMigration()
                        .build()
                }
            }
            return instance
        }
    }
}

@IntelliJAmiya changing my interface to abstract class did not work either, could you explain why i should be doing that? — Zayd Khan
– Zayd Khan, Commented Jun 10, 2020 at 10:22

emen · Accepted Answer · 2022-07-20 15:51:39Z

9

Fixed it by removing suspend from DAO

You cannot use suspend methods for DAO. Suspend function processed in compile time and compiler changes the signature of this function (different return type, an additional argument for state machine callback) to make it non-blocking. Room waits for particular method signature to generate code. So, until Room doesn't support coroutines directly, you cannot use suspend function for DAO.

Found my answer here: Error with Room dao class when using Kotlin coroutines

edited Jul 20, 2022 at 15:51

emen

6,37812 gold badges60 silver badges96 bronze badges

answered Jun 10, 2020 at 13:07

Zayd Khan

1622 silver badges12 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Muhammad Hamza Jul 5 at 19:11

Remove suspend from methods and its working

Ali Doran · Accepted Answer · 2022-07-31 15:10:11Z

3

Removing the suspend is not necessary.
I solve this problem by this link.
Non-identification @Entity annotation

You need only have a small change in your build.gradle
please change this line

kapt "androidx.room:room-compiler:$room"

to this:

annotationProcessor  "androidx.room:room-compiler:$room"

You can use suspend form in your DAO by this way

answered Jul 31, 2022 at 15:10

Ali Doran

6364 silver badges21 bronze badges

Collectives™ on Stack Overflow

error: Type of the parameter must be a class annotated with @Entity or a collection/array of it

2 Answers 2

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related