e: [kapt] An exception occurred: java.lang.IllegalArgumentException: intcannot be converted to an Element

user_9568474 0
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I am trying to implement Room in my android application. I am trying to get data from API and save them in local database. But when I run the application this error occurred

e: [kapt] An exception occurred: java.lang.IllegalArgumentException: intcannot be converted to an Element

This is my database class:

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


    abstract fun userDao(): UserDao

    companion object {

        @Volatile
        private var INSTANCE: UserDatabase? = null

        fun getDatabase(context: Context): UserDatabase {

            if (INSTANCE == null){
                synchronized(this){
                    INSTANCE = Room.databaseBuilder(
                            context.applicationContext,
                            UserDatabase::class.java,
                            "user_database")
                            .build()
                }
            }
            return INSTANCE!!
        }
    }


}

This is my Repository:

class Repository(application: Application) {


    private var mUserDao: UserDao

init {
        val db = UserDatabase.getDatabase(application)


    }
    @WorkerThread
    fun createUser(user: User) {
        mUserDao.createUser(user)
    }

    @WorkerThread
    fun deleteUser(id: Int) {
        mUserDao.deleteUser(id)
    }

    @WorkerThread
    fun getUser(id: Int) {
        mUserDao.getUser(id)
    }

And here is my userDao

@Dao
interface UserDao{

    @Insert(onConflict = OnConflictStrategy.REPLACE)
    fun createUser(user: User)

    @Delete
    fun deleteUser(int: Int)

    @Query("SELECT * FROM user WHERE user_id = :userID")
    fun getUser(userID: Int): LiveData<User>

}

My LogginViewModel:

class LoginViewModel(application: Application) : AndroidViewModel(application) {

    var repository: Repository = Repository(application)


    fun createUser(user: User) = repository.createUser(user)

}

Also this error get occurred:

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:kaptDebugKotlin' <30 internal calls> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)<1 internal call> at java.lang.Thread.run(Thread.java:745) Caused by: org.gradle.api.GradleException: Compilation error. See log for more details at org.jetbrains.kotlin.gradle.tasks.TasksUtilsKt.throwGradleExceptionIfError(tasksUtils.kt:16) at org.jetbrains.kotlin.gradle.internal.KaptWithKotlincTask.compile(KaptWithKotlincTask.kt:79)<17 internal calls> ...33 more

kapt android-room kotlin android
2 Answers

The problem lies in your @Delete

@Delete
fun deleteUser(int: Int)

Which should be

@Delete
fun deleteUser(user: User)

The parameter for @Delete method should be an entity or an array of an entity, not an Int

user_84121920

This is the solution:

As @musooff mentioned above I changed the delete method like this:

@Delete
fun deleteUser(user: User)

or if you want to delete a user with a specific id you do this query:

@Query("DELETE FROM user WHERE user_id = :id")
fun deleteUser(id: Int)

Then to solve next error you should execute methods in UserDao inside an Asynctask in Repository file for example for creating user I did this:

private class insertAsyncTask internal constructor(private val mAsyncTaskDao: UserDao) : AsyncTask<User, Void, Void>() {
    override fun doInBackground(vararg params: User): Void? {
        mAsyncTaskDao.createUser(params[0])
        return null
    }
}

Then createUser function in Repository goes like this:

fun createUser(user: User) {
    insertAsyncTask(mUserDao).execute(user)
}

This solved the problem for me.

user_95684740
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