I have a simple Room implementation in my app and am having issues with the Dao and RoomDatabase classes upon building the app (Build is failing).

1. Dao class is 'NoteDao'

   @Dao
   interface NoteDao {
   
    @Query("SELECT * FROM notes")
    suspend fun getAllNotes(): List<Note>
   
    @Query("SELECT * FROM notes WHERE uid = :uid")
    suspend fun getNoteByUid(uid: Int): Note
   
    @Insert(onConflict = OnConflictStrategy.REPLACE)
    suspend fun insertNote(note: Note): Long
   
    @Delete
    suspend fun deleteNote(note: Note): Int
   }
   

2. RoomDatabase class

    @Database(
        entities = [Note::class],
        version = 1,
        exportSchema = false
    )
    abstract class AppDatabase : RoomDatabase() {
   
    abstract fun noteDao() : NoteDao
   
    companion object {
   
        @Volatile private var instance: AppDatabase? = null
   
        fun getDatabase(context: Context): AppDatabase =
            instance ?: synchronized(this) { instance ?: buildDatabase(context).also { instance = it } }
   
        private fun buildDatabase(appContext: Context) =
            Room.databaseBuilder(appContext, AppDatabase::class.java, "NADB")
                .fallbackToDestructiveMigration()
                .build()
    }
   }
   

3. Note Entity

    @Entity(tableName = "notes")
    data class Note (
            @PrimaryKey(autoGenerate = true)
            val uid: Long,
            val title: String,
            val content: String,
            @ColumnInfo(name = "image_url") val imageUrl: String,
            @ColumnInfo(name = "created_on") val createdOn: Long,
            @ColumnInfo(name = "edited_on") val editedOn: Long
        )
   

Build Output errors -

1. NoteDao_Impl.java

/Users/KK/StudioProjects/K-K/app/build/generated/source/kapt/debug/com/task/noteapp/data/daos/NoteDao_Impl.java:29: error: duplicate class: com.task.noteapp.data.daos.NoteDao_Impl public final class NoteDao_Impl implements NoteDao {

and

2. AppDatabase_Impl.java

/Users/KK/StudioProjects/K-K/app/build/generated/source/kapt/debug/com/task/noteapp/data/local/AppDatabase_Impl.java:34: error: duplicate class: com.task.noteapp.data.local.AppDatabase_Impl public final class AppDatabase_Impl extends AppDatabase {

followed by -

Execution failed for task ':app:kaptDebugKotlin'. A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptWithoutKotlincTask$KaptExecutionWorkAction java.lang.reflect.InvocationTargetException (no error message)

Exception is: org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:kaptDebugKotlin'. Caused by: org.gradle.workers.internal.DefaultWorkerExecutor$WorkExecutionException: A failure occurred while executing org.jetbrains.kotlin.gradle.internal.KaptWithoutKotlincTask$KaptExecutionWorkAction Caused by: java.lang.reflect.InvocationTargetException

Caused by: org.jetbrains.kotlin.kapt3.base.util.KaptBaseError: Error while annotation processing

On further investigation, I found the following issues with the respective generated files -

1. NoteDao_Impl - class level error

Class 'NoteDao_Impl' must either be declared abstract or implement abstract method 'getAllNotes(Continuation<? super List<? extends Note>>)' in 'NoteDao'

and within this class, the 'getAllNotes()' method had this error -

getAllNotes(Continuation<? super List>)' in 'com.task.noteapp.data.daos.NoteDao_Impl' clashes with 'getAllNotes(Continuation<? super List<? extends Note>>)' in 'com.task.noteapp.data.daos.NoteDao'; both methods have same erasure, yet neither overrides the other

2. AppDatabase_Impl - class level error

Duplicate class found in the file '/Users/KK/StudioProjects/K-K/app/build/generated/ksp/debug/java/com/task/noteapp/data/local/AppDatabase_Impl.java'

As far as I can see that my implementation of Room is not wrong. However, I can’t figure out the issues.

Dependencies -

def room_version = "2.4.3"
implementation "androidx.room:room-runtime:$room_version"
implementation "androidx.room:room-ktx:$room_version"
annotationProcessor "androidx.room:room-compiler:$room_version"
kapt "androidx.room:room-compiler:$room_version"
ksp "androidx.room:room-compiler:$room_version"

CodePudding user response：

Try this version,

def room_version = "2.5.0-beta01"

I found the same issue,, tried everything, it didn't work. Then I just update my dependencies of room along with navigational components. That fixed my problem.

CodePudding user response：

kapt and ksp seems to be in conflict. Removing kapt seems to have solved the issue.

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

ksp "androidx.room:room-compiler:$room_version"