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

Answer 1

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

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

Answer 2

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'

Answer 3

Rule of thumb when using Kotlin:

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

Answer 4

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"

Answer 5

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

Answer 6

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.