Cannot set up Realm in project using Kotlin

Question

I'm trying to build a test project in Kotlin with Realm. Here's my model:

open class Book : RealmObject() { // Standard getters & setters generated by your IDE… @PrimaryKey open var id: Long = 0 open var title = "" open var description = "" open var author = "" open var imageUrl = "" }

and here's exception I get:

FATAL EXCEPTION: main Process: app.androidhive.info.realm, PID: 18782 java.lang.RuntimeException: Unable to start activity ComponentInfo{app.androidhive.info.realm/app.androidhive.info.realm.activity.MainActivity}: java.lang.IllegalArgumentException: Book is not part of the schema for this Realm at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) at android.app.ActivityThread.-wrap11(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) Caused by: java.lang.IllegalArgumentException: Book is not part of the schema for this Realm

I searched around for the solution so and added classpath "io.realm:realm-gradle-plugin:2.2.2" in build.gradle and apply plugin: 'realm-android' and

dependencies { ... // Realm compile 'io.realm:realm-android:0.87.4' kapt "io.realm:realm-annotations:0.87.4" kapt "io.realm:realm-annotations-processor:0.87.4" }

into build script in module app. It gives me another problem:

Error:(15, 48) Cannot access '<init>': it is public/*package*/ in 'Builder' /Volumes/Toshiba/Users/macuser/Development/Android/Exersises/MyApplication/app/src/main/java/realmtest/realm/RealmController.kt Error:(27, 15) Unresolved reference: refresh Error:(34, 15) Unresolved reference: clear Error:(53, 23) Unresolved reference: allObjects [KOTLIN] deleting /Volumes/Toshiba/Users/macuser/Development/Android/Exersises/MyApplication/app/build/tmp/kotlin-classes/debug on error

I can only build my project successfully if Book is written in java. Any suggestion how to make Realm and Kotlin work together?

@EpicPandaForce, do you mean verson 2.2.3 of io.realm:realm-gradle-plugin? I've tried this and I've got "Could not find io.realm:realm-gradle-plugin:2.2.3" gradle build Error — AlexKost
– AlexKost, Commented Jan 16, 2017 at 5:08

Эльнар Берхеев · Accepted Answer · 2017-01-15 21:39:10Z

2

Use RealmClass annotation + RealmModel interface

import io.realm.Realm import io.realm.RealmModel import io.realm.annotations.PrimaryKey import io.realm.annotations.RealmClass @RealmClass open class Example( @PrimaryKey open var Id : Long = 0, open var Field : String = "" ) : RealmModel

In module gradle file add

apply plugin: 'realm-android'

In project gradle file add

classpath "io.realm:realm-gradle-plugin:2.2.2"

No additional compile/kapt needed

edited Jan 15, 2017 at 21:39

answered Jan 15, 2017 at 16:28

Эльнар Берхеев

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3 Comments

AlexKost Over a year ago

Thanks, @Эльнар Берхеев, it helped! Just in case it would help someone: I had to make few other changes to build the project.

AlexKost Over a year ago

Theres no need for args in RealmConfiguretion.Build() call and I had to call Realm.init(context) before it. Also refresh(), clean() and allObjects() method were replaced with waitForChange(), delete() and where().findAll() methods respectively, as stated here: github.com/realm/realm-java/issues/2864. Cheers!

EpicPandaForce Over a year ago

waitForChange() works differently than refresh(), use this instead stackoverflow.com/a/38839808/2413303

Saeed · Accepted Answer · 2017-10-21 17:28:26Z

Realm java 4.1.0 has been released and most problem of Realm with Kotlin has resolved! You don't need to use open var just use var. You can test my sample project. My sample is for testing module in Realm object Server with kotlin.

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