问题
I am trying to add Room in my project which is Java + Kotlin, but when I try to compile the project, it fails on :app:kaptDebugKotlin with following error:
e: java.lang.IllegalStateException: failed to analyze: java.lang.IllegalArgumentException: void cannot be converted to an Element
at org.jetbrains.kotlin.analyzer.AnalysisResult.throwIfError(AnalysisResult.kt:57)
at org.jetbrains.kotlin.cli.jvm.compiler.KotlinToJVMBytecodeCompiler.compileModules(KotlinToJVMBytecodeCompiler.kt:138)
at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:154)
at org.jetbrains.kotlin.cli.jvm.K2JVMCompiler.doExecute(K2JVMCompiler.kt:58)
at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:103)
at org.jetbrains.kotlin.cli.common.CLICompiler.execImpl(CLICompiler.java:51)
at org.jetbrains.kotlin.cli.common.CLITool.exec(CLITool.kt:92)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$1$2.invoke(CompileServiceImpl.kt:386)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$compile$1$2.invoke(CompileServiceImpl.kt:96)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:889)
at org.jetbrains.kotlin.daemon.CompileServiceImpl$doCompile$$inlined$ifAlive$lambda$2.invoke(CompileServiceImpl.kt:96)
at org.jetbrains.kotlin.daemon.common.DummyProfiler.withMeasure(PerfUtils.kt:137)
at org.jetbrains.kotlin.daemon.CompileServiceImpl.checkedCompile(CompileServiceImpl.kt:916)
at org.jetbrains.kotlin.daemon.CompileServiceImpl.doCompile(CompileServiceImpl.kt:888)
at org.jetbrains.kotlin.daemon.CompileServiceImpl.compile(CompileServiceImpl.kt:385)
at sun.reflect.GeneratedMethodAccessor88.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:346)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalArgumentException: void cannot be converted to an Element
at com.google.auto.common.MoreTypes$AsElementVisitor.defaultAction(MoreTypes.java:532)
at com.google.auto.common.MoreTypes$AsElementVisitor.defaultAction(MoreTypes.java:527)
at javax.lang.model.util.SimpleTypeVisitor6.visitNoType(SimpleTypeVisitor6.java:226)
at com.sun.tools.javac.code.Type$JCVoidType.accept(Type.java:1736)
at com.google.auto.common.MoreTypes.asElement(MoreTypes.java:524)
at com.google.auto.common.MoreTypes.asTypeElement(MoreTypes.java:553)
Here are the versions I am using:
kotlin_version = '1.1.51'
room library version = '1.0.0'
android build tool = '3.0.1'
below things I have added in my gradle for Room:
kapt "com.android.databinding:compiler:3.0.1"
//Room
implementation "android.arch.persistence.room:runtime:1.0.0"
kapt "android.arch.persistence.room:compiler:1.0.0"
implementation "android.arch.persistence.room:rxjava2:1.0.0"
I have also added apply plugin: 'kotlin-kapt' in my build.gradle.
Here's how I have implemented Room Library:
RoomDatabase.kt
@Database(entities = arrayOf(ProductTest::class), version = CartDatabase.DATABASE_VERSION)
abstract class CartDatabase : RoomDatabase() {
companion object {
const val DATABASE_VERSION = 1
const val DATABASE_NAME = "sall_customer_db"
}
abstract var cartRepositoryImpl: CartRepositoryImpl
}
ProductTest.kt
@Entity
data class ProductTest(
@PrimaryKey
@ColumnInfo(name = "id")
var productId: Int,
@ColumnInfo(name = "name")
var productName: String
)
CartRepositoryImpl.kt
@Dao
interface CartRepositoryImpl : CartRepository {
@Insert(onConflict = OnConflictStrategy.REPLACE)
override fun addToCart(product: ProductTest): Long
}
I have just coded this without using it anywhere & tried to compile, but it fails. It compiles fine if I comment out the Room stuff from gradle & code but fails with just the above code.
Have already tried cleaning the project but it didn't help. Am I missing something here? Please help me out here.
Edit I created the new demo project to check & I am also facing the same compilation error there. The Room related code is same as above, here I am adding the full build.gradle from my demo:
Project level gradle:
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext.kotlin_version = '1.1.51'
repositories {
google()
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:3.0.0'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
}
}
// Versions
ext {
support_library_version = '27.0.0'
play_services_version = '11.6.2'
retrofit_version = '2.3.0'
arch_components_version = '1.0.0'
}
task clean(type: Delete) {
delete rootProject.buildDir
}
app module's gradle
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'
android {
compileSdkVersion 26
defaultConfig {
applicationId "com.abc.kotlinroomdemo"
minSdkVersion 14
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
implementation 'com.android.support:appcompat-v7:26.1.0'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
// RxJava2
implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
implementation 'io.reactivex.rxjava2:rxjava:2.1.5'
//Room
implementation "android.arch.persistence.room:runtime:$arch_components_version"
implementation "android.arch.persistence.room:rxjava2:$arch_components_version"
kapt "android.arch.persistence.room:compiler:$arch_components_version"
//Dagger 2
//compile 'com.google.dagger:dagger-android:2.10'
//kapt 'com.google.dagger:dagger-android-processor:2.10'
//compileOnly 'com.google.dagger:dagger:2.10'
//implementation 'com.google.dagger:dagger:2.13'
//kapt 'com.google.dagger:dagger-compiler:2.13'
//provided 'javax.annotation:jsr250-api:1.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.1'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
}
回答1:
Maaan! What a silly mistake! In abstract RoomDatabase class, we need to declare the abstract fun returning the Dao object but I had defined abstract var there.
So changing
abstract var cartRepositoryImpl: CartRepositoryImpl
to:
abstract fun cartRepositoryImpl(): CartRepositoryImpl
fixed the compilation error! I overlooked this while following the stuff from a blog I admit, but still the better compile time error wouldn't have hurt!
回答2:
Try this
annotationProcessor "android.arch.persistence.room:compiler:1.0.0"
instead of
kapt "android.arch.persistence.room:compiler:1.0.0"
回答3:
I run into same exception when my database definition implemented Closeable interface.
It required empty override to pass that:
override fun close() {
super.close()
}
回答4:
In my case, I have added a function in the Dao layer which having no Table in it.
Mistake:
@Dao
interface ProductDao {
@Insert
fun insert(product: Int) // Here Int can't save in Room DB
}
This worked for me:
@Dao
interface ProductDao {
@Insert
fun insert(product: Product) // Here I added table instead Int
}
回答5:
in my case In Database Abstract class I changed var to val. like below :
abstract var noteDao: NoteDao
to this :
abstract val noteDao: NoteDao
and worked for me.
回答6:
I may be late to answer, but this is what worked for me after trying so many times and getting different errors.
implementation 'androidx.room:room-runtime:2.2.2'
kapt 'androidx.room:room-compiler:2.2.2'
but in my older project I were using this
implementation 'android.arch.persistence.room:runtime:1.1.1'
annotationProcessor 'android.arch.persistence.room:compiler:1.1.1'
you can give it a try
来源：https://stackoverflow.com/questions/47676905/kotlin-room-java-lang-illegalargumentexception-void-cannot-be-converted-to