Room Persistence Library run time exception when calling Rooms inMemoryBuilder method

Question

When following the tutorial for setting up the Room persistence library I run in to this error when testing on an Android device.

java.lang.RuntimeException: cannot find implementation for PackageName.AppDatabase. AppDatabase_Impl does not exist

I know a similar question has been asked however the issues were due to kotlin gradle issues. Possible Duplicate

Test class:

@RunWith(AndroidJUnit4.class)
public class LocalDatabaseTest {

    private PhotoDao mPhotoDao;
    private AppDatabase mDb;

    @Before
    public void createDb() {
        Context context = InstrumentationRegistry.getTargetContext();
        mDb = Room.inMemoryDatabaseBuilder(context.getApplicationContext(), AppDatabase.class).build();
        mPhotoDao = mDb.photoDao();
    }

    @After
    public void closeDb() throws IOException {
    //mDb.close();
}

    @Test
    public void testPreConditions() {
        assertNotNull(mDb);
   }

Dao:

    @Dao
    public interface PhotoDao {
    @Delete()
    public void delete(Photo... photos);

    @Update
    public void update(Photo ... photos);

    @Insert
    public void insert(Photo ... photos);
    }

Database:

@Database(entities = {Photo.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
public abstract PhotoDao photoDao();
}

Stack Trace:

java.lang.RuntimeException: cannot find implementation for *PackageName*.AppDatabase. AppDatabase_Impl does not exist
at android.arch.persistence.room.Room.getGeneratedImplementation(Room.java:90)
at android.arch.persistence.room.RoomDatabase$Builder.build(RoomDatabase.java:340)
at pics.chooz.choozpics.LocalDatabaseTest.createDb(LocalDatabaseTest.java:40)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:59)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:262)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1853)

Gradle:

apply plugin: "com.android.application"
apply plugin: "android-apt"

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"

    defaultConfig {
        applicationId "*Package Name*"
        minSdkVersion 16
        targetSdkVersion 25
        versionCode 50
        versionName "1.0.32"
        multiDexEnabled true
        testInstrumentationRunner     "android.support.test.runner.AndroidJUnitRunner"
}

dexOptions {
    javaMaxHeapSize "4g"
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
    }
    debug {
        debuggable true
    }
}

lintOptions {
    abortOnError false
    disable "ResourceType"
}

sourceCompatibility = 1.7
targetCompatibility = 1.7
compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_7
    targetCompatibility JavaVersion.VERSION_1_7
}

packagingOptions {
    exclude 'META-INF/ASL2.0'
    exclude 'META-INF/LICENSE'
    exclude 'META-INF/NOTICE'
}
}
dependencies {

androidTestCompile "com.android.support:support-annotations:$androidVersion"
androidTestCompile 'com.android.support.test:runner:0.5'
androidTestCompile 'com.android.support.test:rules:0.5'

    compile "android.arch.persistence.room:runtime:1.0.0-alpha1"
    annotationProcessor "android.arch.persistence.room:compiler:1.0.0-alpha1"
}

Is it throwing error in testing only? or in developmene also .? — Moinkhan, Jun 08 '17 at 04:33

score 48 · Accepted Answer · edited Feb 06 '18 at 22:57

48

I changed the 'annotationProcessor' keyword to 'kapt' in my gradle file. Like so:

kapt "android.arch.persistence.room:compiler:1.0.0"

edited Feb 06 '18 at 22:57

ayz4sci

2,220
1
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17

answered Jun 16 '17 at 06:42

dxpelou

916
1
8
16

Same problem here. This fixed it. Going back to a deprecated annotation processor is not optimal though. – Bohsen Jun 20 '17 at 07:56
2

This did not fix it for me - I'm already using annotationProcessor – galaxigirl Nov 15 '17 at 11:48
7

`apply plugin: 'kotlin-kapt'` is a must! Even though your build works without adding it, adding it makes the annotation processor behave differently (e.g. not renaming parameters needed for SQL placeholders) – Randy Sugianto 'Yuku' Jan 02 '18 at 09:11
Don't forget to clean your project afterward. – user3144836 Feb 19 '18 at 06:32
I have conflict with Glide when change to kapt. How can i fix it? – Sinh Phan Mar 11 '18 at 15:59
@PhanSinh whats the conflict? – dxpelou Mar 17 '18 at 07:43
@dxpelou I have fixed. An Entity missing `@Notnull` annotation in primary key – Sinh Phan Mar 17 '18 at 10:32

score 27 · Answer 2 · answered Nov 20 '17 at 14:31

27

Rule of thumb when using Kotlin:

Replace your annotationProcessor dependencies with kapt. Also, include apply plugin: 'kotlin-kapt' in your app's build.gradle.

answered Nov 20 '17 at 14:31

solidak

5,033
3
31
33

Thanks - as you said `kapt "android.arch.persistence.room:compiler:$archRoomVersion"` instead of 'annotationProcessor' does the job – kosiara - Bartosz Kosarzycki Jan 15 '18 at 14:00

score 12 · Answer 3 · answered Oct 15 '17 at 15:23

12

Have a look on this thread

The solution is to replace :

annotationProcessor "android.arch.persistence.room:compiler:VERSION"

with :

kapt "android.arch.persistence.room:compiler:VERSION"

answered Oct 15 '17 at 15:23

Simon Rolin

940
13
34

galaxigirl · Answer 4 · 2017-11-21T15:17:06.640

2

You must add the annotation processor dependency to the module where your AppDatabase is. I assumed that the app would take the depencency from my API library module, where my data model classes are, but apparently this is not the case.

Answer came from this google issue: https://issuetracker.google.com/issues/67520422 And this SO answer: https://stackoverflow.com/a/43918701/1959110

edited Nov 21 '17 at 15:17

answered Nov 15 '17 at 12:46

galaxigirl

2,390
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score 1 · Answer 5 · answered Apr 12 '18 at 08:34

Had the same issue with

gradle 3.2.0-alpha09
koltin 1.2.31

Due the removal of apply plugin: 'kotlin-kapt' and other buggy stuff.. I had to downgrade to kotlin 1.1.60 to make it work. Then use:

apply plugin: 'kotlin-kapt'

dependencies {
    ...
    implementation 'android.arch.persistence.room:runtime:1.0.0'
    kapt "android.arch.persistence.room:compiler:1.0.0"
}

an other option would be to write the DB entities/DAOs and DataBase in Java instead.

score 0 · Answer 6 · answered Sep 23 '19 at 10:43

0

In my case I have change scheme but forgot to change version number.

@Database(entities = {Task1.class, Task2.class}, version = 2)

answered Sep 23 '19 at 10:43

Zeeshan Ali

2,211
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score -1 · Answer 7 · answered Apr 21 '18 at 16:56

-1

For kotlin

 //Room
implementation "android.arch.persistence.room:runtime:1.0.0"
//Room annotation processor
kapt "android.arch.persistence.room:compiler:1.0.0"

apply plugin: 'kotlin-kapt'

answered Apr 21 '18 at 16:56

Shaon

2,496
26
27

score -1 · Answer 8 · answered Jun 19 '18 at 14:44

-1

change the annotationProcessor from annotationProcessor 'android.arch.persistence.room:runtime:1.1.0' to annotationProcessor 'android.arch.persistence.room:compiler:1.1.0'

answered Jun 19 '18 at 14:44

Musa Abdul Wadud

147
1
3

1

To turn this into a good answer, you should add some more information. Why does this solve the problem? – Laurenz Albe Jun 19 '18 at 14:59

Room Persistence Library run time exception when calling Rooms inMemoryBuilder method

8 Answers8

Rule of thumb when using Kotlin:

Linked