I've been working on dictionary app for a while in kotlin with compose. I want the user to be able to create their own dictionary as a feature of the application.I use the room database for this, I have done all the integrations, but I don't understand why it keeps getting errors. I checked everything but couldn't find where the problem is originating from. I will share my codes and errors.
errors
error: Entities and POJOs must have a usable public constructor. You can have an empty constructor or a constructor whose parameters match the fields (by name and type). - kotlin.Unit
C:\Users\enest\AndroidStudioProjects\DictionaryApp\app\build\tmp\kapt3\stubs\debug\com\enestigli\dictionaryapp\data\locale\OwnDicDao.java:11: error: Not sure how to convert a Cursor to this method's return type (kotlin.Unit).
public abstract java.lang.Object GetAllDictionary(@org.jetbrains.annotations.NotNull()
^
C:\Users\enest\AndroidStudioProjects\DictionaryApp\app\build\tmp\kapt3\stubs\debug\com\enestigli\dictionaryapp\data\locale\OwnDicDao.java:11: warning: The query returns some columns [dicName, creationTime, uid] which are not used by kotlin.Unit. You can use @ColumnInfo annotation on the fields to specify the mapping. You can annotate the method with @RewriteQueriesToDropUnusedColumns to direct Room to rewrite your query to avoid fetching unused columns. You can suppress this warning by annotating the method with @SuppressWarnings(RoomWarnings.CURSOR_MISMATCH). Columns returned by the query: dicName, creationTime, uid. Fields in kotlin.Unit: .
public abstract java.lang.Object GetAllDictionary(@org.jetbrains.annotations.NotNull()
^
C:\Users\enest\AndroidStudioProjects\DictionaryApp\app\build\tmp\kapt3\stubs\debug\com\enestigli\dictionaryapp\data\locale\OwnDicDao.java:33: error: Unused parameter: dicId
public abstract java.lang.Object Update(@org.jetbrains.annotations.Nullable()
^
C:\Users\enest\AndroidStudioProjects\DictionaryApp\app\build\tmp\kapt3\stubs\debug\com\enestigli\dictionaryapp\data\locale\OwnDictionaryDatabase.java:7: warning: Schema export directory is not provided to the annotation processor so we cannot export the schema. You can either provide `room.schemaLocation` annotation processor argument OR set exportSchema to false.
public abstract class OwnDictionaryDatabase extends androidx.room.RoomDatabase {
FAILURE: Build failed with an exception.
* What went wrong:
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$KaptExecutionWorkAction
Caused by: java.lang.reflect.InvocationTargetException
at org.jetbrains.kotlin.gradle.internal.KaptExecution.run(KaptWithoutKotlincTask.kt:288)
at org.jetbrains.kotlin.gradle.internal.KaptWithoutKotlincTask$KaptExecutionWorkAction.execute(KaptWithoutKotlincTask.kt:243)
Caused by: org.jetbrains.kotlin.kapt3.base.util.KaptBaseError: Error while annotation processing
at org.jetbrains.kotlin.kapt3.base.AnnotationProcessingKt.doAnnotationProcessing(annotationProcessing.kt:130)
at org.jetbrains.kotlin.kapt3.base.AnnotationProcessingKt.doAnnotationProcessing$default(annotationProcessing.kt:31)
at org.jetbrains.kotlin.kapt3.base.Kapt.kapt(Kapt.kt:45)
Deprecated Gradle features were used in this build, making it incompatible with Gradle 8.0.
You can use '--warning-mode all' to show the individual deprecation warnings and determine if they come from your own scripts or plugins.
OwnDicDao
@Dao
interface OwnDicDao {
@Query("SELECT * FROM OwnDictionaries")
suspend fun GetAllDictionary()
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun Insert(dictionary: OwnDicEntity)
@Delete
suspend fun Delete(dictionary: OwnDicEntity)
@Query("DELETE FROM owndictionaries")
suspend fun DeleteAll()
@Query("UPDATE OwnDictionaries SET dicName =:dicName")
suspend fun Update(dicId:Int?,dicName:String)
}
When I comment out the @Query anatations, that is, when I comment out the Update and GetAllDictionary functions, the problems disappear and the application works properly. I noticed this.
for example like this
/* @Query("UPDATE OwnDictionaries SET dicName =:dicName")
suspend fun Update(dicId:Int?,dicName:String)*/
/* @Query("SELECT * FROM OwnDictionaries")
suspend fun GetAllDictionary()*/
OwnDicEntity
@Entity(tableName = "OwnDictionaries")
data class OwnDicEntity(
@ColumnInfo(name = "dicName") val ownDicName:String,
@ColumnInfo(name = "creationTime") val creationTime:String,
@PrimaryKey(autoGenerate = true) val uid: Int? = null
)
OwnDicDatabase
@Database(
entities = [OwnDicEntity::class],
version = 1
)
abstract class OwnDicDatabase: RoomDatabase() {
abstract val ownDicDao: OwnDicDao
}
build.gradle(Module)
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
id 'kotlin-kapt'
id 'dagger.hilt.android.plugin'
id 'org.jetbrains.kotlin.android.extensions'
}
android {
compileSdk 32
defaultConfig {
applicationId "com.enestigli.dictionaryapp"
minSdk 21
targetSdk 32
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
vectorDrawables {
useSupportLibrary true
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
buildFeatures {
compose true
}
composeOptions {
kotlinCompilerExtensionVersion compose_version
}
packagingOptions {
resources {
excludes = '/META-INF/{AL2.0,LGPL2.1}'
}
}
androidExtensions {
experimental = true
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.7.0'
implementation "androidx.compose.ui:ui:$compose_version"
implementation "androidx.compose.material:material:$compose_version"
implementation "androidx.compose.ui:ui-tooling-preview:$compose_version"
implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.3.1'
implementation 'androidx.activity:activity-compose:1.3.1'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
androidTestImplementation "androidx.compose.ui:ui-test-junit4:$compose_version"
debugImplementation "androidx.compose.ui:ui-tooling:$compose_version"
debugImplementation "androidx.compose.ui:ui-test-manifest:$compose_version"
// Retrofit
implementation 'com.squareup.retrofit2:retrofit:2.9.0'
implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
implementation "com.squareup.okhttp3:okhttp:4.9.0"
implementation "com.squareup.okhttp3:logging-interceptor:4.9.0"
//Dagger - Hilt
implementation "com.google.dagger:hilt-android:2.38.1"
kapt "com.google.dagger:hilt-android-compiler:2.38.1"
//implementation "androidx.hilt:hilt-lifecycle-viewmodel:1.0.0-alpha03"
kapt "androidx.hilt:hilt-compiler:1.0.0"
implementation 'androidx.hilt:hilt-navigation-compose:1.0.0-alpha03'
// Coroutines
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.5.1'
implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.1'
// Coroutine Lifecycle Scopes
implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1"
implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.3.1"
// Room
implementation "androidx.room:room-runtime:2.3.0"
kapt "androidx.room:room-compiler:2.3.0"
// To use Kotlin annotation processing tool (kapt)
// Kotlin Extensions and Coroutines support for Room
implementation "androidx.room:room-ktx:2.3.0"
//Material theme3
implementation "androidx.compose.material3:material3:1.0.0-alpha12"
implementation "androidx.compose.material3:material3-window-size-class:1.0.0-alpha12"
//skrape{it}
implementation 'org.jsoup:jsoup:1.12.1'
//compose
implementation "androidx.compose.runtime:runtime-livedata:$compose_version"
}
build.gradle(Project)
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext {
compose_version = '1.0.1'
}
repositories {
google()
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:7.2.2'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.21"
classpath 'com.google.dagger:hilt-android-gradle-plugin:2.40.1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
When I delete room completely, for example, when I delete classes such as dao, database, entity, it works as before, and as I said above, it works when I remove or comment @Query queries. What could be the problem, I've been dealing with these errors for 2 days. I have not encountered such errors when using room in my previous projects.
CodePudding user response：
The issue from as your quires returning some data so you need implement return type to suspend function like below
@Dao
interface OwnDicDao {
@Query("SELECT * FROM OwnDictionaries")
suspend fun GetAllDictionary():List<OwnDicEntity> // here change
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun Insert(dictionary: OwnDicEntity)
@Delete
suspend fun Delete(dictionary: OwnDicEntity)
@Query("DELETE FROM owndictionaries")
suspend fun DeleteAll() // here no change need because it returns nothing
@Query("UPDATE OwnDictionaries SET dicName =:dicName")
suspend fun Update(dicId:Int?,dicName:String):List<OwnDicEntity> //here change
}