Crash while using SNAPSHOT version with GSON

Hello,

I’m trying to use the 0.11.0-SNAPSHOT version of the SDK.

I can build and run the app, but when I try to deserialize some JSON data, I’ve got a crash.

If I use the non-snapshot version (0.10.2), everything works perfectly.

I added my settings.gradle, global build.gradle & module build.gradle files to show how I configured the snapshot version.

Did I do something wrong?

Stacktrace:

2022-04-28 09:03:23.291 E/AndroidRuntime: FATAL EXCEPTION: DefaultDispatcher-worker-3
    Process: com.test.realmkotlin, PID: 5675
    java.lang.AssertionError: AssertionError (GSON 2.9.0): illegal type variable reference
        at com.google.gson.Gson.fromJson(Gson.java:1008)
        at com.google.gson.Gson.fromJson(Gson.java:956)
        at com.google.gson.Gson.fromJson(Gson.java:905)
        at com.test.realmkotlin.data.api.ApiRepository.getMailboxes(ApiRepository.kt:406)
        at com.test.realmkotlin.data.cache.MailRealm.getMailboxes(MailRealm.kt:55)
        at com.test.realmkotlin.ui.main.TestRealmViewModel.testRealm(TestRealmViewModel.kt:61)
        at com.test.realmkotlin.ui.main.MainActivity$onCreate$1$1.invokeSuspend(MainActivity.kt:40)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
        at kotlinx.coroutines.internal.LimitedDispatcher.run(LimitedDispatcher.kt:39)
        at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:95)
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)
     Caused by: java.lang.AssertionError: illegal type variable reference
        at libcore.reflect.TypeVariableImpl.resolve(TypeVariableImpl.java:111)
        at libcore.reflect.TypeVariableImpl.getGenericDeclaration(TypeVariableImpl.java:125)
        at libcore.reflect.TypeVariableImpl.hashCode(TypeVariableImpl.java:47)
        at java.util.HashMap.hash(HashMap.java:338)
        at java.util.HashMap.get(HashMap.java:556)
        at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:353)
        at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:396)
        at com.google.gson.internal.$Gson$Types.resolve($Gson$Types.java:343)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:159)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:101)
        at com.google.gson.Gson.getAdapter(Gson.java:501)
        at com.google.gson.internal.bind.CollectionTypeAdapterFactory.create(CollectionTypeAdapterFactory.java:53)
        at com.google.gson.Gson.getAdapter(Gson.java:501)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:116)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:165)
        at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:101)
        at com.google.gson.Gson.getAdapter(Gson.java:501)
        at com.google.gson.Gson.fromJson(Gson.java:990)
        at com.google.gson.Gson.fromJson(Gson.java:956) 
        at com.google.gson.Gson.fromJson(Gson.java:905) 
        at com.test.realmkotlin.data.api.ApiRepository.getMailboxes(ApiRepository.kt:406) 
        at com.test.realmkotlin.data.cache.MailRealm.getMailboxes(MailRealm.kt:55) 
        at com.test.realmkotlin.ui.main.TestRealmViewModel.testRealm(TestRealmViewModel.kt:61) 
        at com.test.realmkotlin.ui.main.MainActivity$onCreate$1$1.invokeSuspend(MainActivity.kt:40) 
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33) 
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106) 
        at kotlinx.coroutines.internal.LimitedDispatcher.run(LimitedDispatcher.kt:39) 
        at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:95) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678) 
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665) 

settings.gradle:

pluginManagement {
    repositories {
        gradlePluginPortal()
        google()
        mavenCentral()
    }
}

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        maven { url 'https://jitpack.io' }
        maven { url 'https://oss.sonatype.org/content/repositories/snapshots' } // Realm Kotlin SNAPSHOT
    }
}

rootProject.name = 'realmkotlin'
include ':app'

Global build.gradle:

buildscript {
    ext.gradle_version = '7.1.3'
    ext.kotlin_version = '1.6.20'
    ext.realm_kotlin_version = '0.11.0-SNAPSHOT' // Realm Kotlin SNAPSHOT
    ext.navigation_version = '2.4.2'
    ext.java_version = JavaVersion.VERSION_1_8

    repositories { maven { url 'https://oss.sonatype.org/content/repositories/snapshots' } } // Realm Kotlin SNAPSHOT
    dependencies { classpath "io.realm.kotlin:gradle-plugin:$realm_kotlin_version" } // Realm Kotlin SNAPSHOT
}

plugins {
    id 'com.android.application' version "$gradle_version" apply false
    id 'com.android.library' version "$gradle_version" apply false
    id 'org.jetbrains.kotlin.android' version "$kotlin_version" apply false
}

task clean(type: Delete) { delete rootProject.buildDir }

Module build.gradle:

plugins {
    id 'com.android.application'
    id 'org.jetbrains.kotlin.android'
}

configurations.all { resolutionStrategy.cacheChangingModulesFor 0, 'seconds' } // Realm Kotlin SNAPSHOT
apply plugin: "io.realm.kotlin" // Realm Kotlin SNAPSHOT

android {
    compileSdk 32

    defaultConfig {
        applicationId 'com.test.realmkotlin'
        minSdk 24
        targetSdk 32
        versionCode 1
        versionName '1.0'
        testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        sourceCompatibility rootProject.ext.java_version
        targetCompatibility rootProject.ext.java_version
    }

    kotlinOptions { jvmTarget = rootProject.ext.java_version }

    buildFeatures { viewBinding true }
}

dependencies {
    implementation "io.realm.kotlin:library-base:$rootProject.ext.realm_kotlin_version" // Realm Kotlin SNAPSHOT

    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

[cmelchior]

This should fix the issues:

    var gson: Gson = GsonBuilder()
        .registerTypeAdapter(Date::class.java, CustomDateTypeAdapter())
        .setExclusionStrategies(object: ExclusionStrategy {
            override fun shouldSkipField(f: FieldAttributes?): Boolean =
                f?.name?.startsWith("io_realm_kotlin_") ?: false
            override fun shouldSkipClass(clazz: Class<*>?): Boolean =
                false
        })
        .create()

I suspect GSON is having issues with our internal class, this one: https://github.com/realm/realm-kotlin/blob/master/packages/library-base/src/commonMain/kotlin/io/realm/internal/RealmObjectReference.kt#L44, but ignoring it should be perfectly fine.

I’ll make sure it gets added to our documentation.

[cmelchior]

Hi @KevinBoulongne Thanks for the hint, I’m taking a look.