Kotlin MyClass.class.java Unresolved reference: java

Question

In Java Android we use MyActivity.class to start a new activity. I was playing with Android Studio 3 beta1 and tried to convert it to kotlin. It gets converted to MyActivity::class.java but this doesn't compile. It gives me Unresolved reference: java. What would be the correct equivalent?

Project Build.gradle:

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0-beta1'
        classpath 'com.google.gms:google-services:3.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        jcenter()
        maven { url "https://jitpack.io" }
    }
}

App Build.gradle:

apply plugin: 'com.android.application'

android {
    signingConfigs {
    }
    compileSdkVersion 25
    buildToolsVersion "25.0.2"
    lintOptions {
        abortOnError false
    }
    defaultConfig {
        vectorDrawables.useSupportLibrary = true
        applicationId "app"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 104
        versionName "4.0.11"
    }

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

    productFlavors {
        free {
            dimension "mode"
        }
        paid {
            dimension "mode"
            applicationId "app.paid"
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}


dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support:support-v4:25.3.1'
    compile 'com.android.support:design:25.3.1'
    compile 'com.android.support:recyclerview-v7:25.3.1'
    compile 'com.android.support:cardview-v7:25.3.1'
    compile 'com.google.android.gms:play-services-ads:10.2.6'
    releaseCompile 'ch.acra:acra:4.9.1'
    //    compile 'ch.acra:acra:4.9.1'
    compile 'com.google.firebase:firebase-core:10.2.6'
    compile 'com.google.firebase:firebase-database:10.2.6'
    compile 'com.google.firebase:firebase-auth:10.2.6'
    compile 'com.google.android.gms:play-services-auth:10.2.6'
    compile 'com.github.frangsierra:rx2firebase:1.1.3'
}

apply plugin: 'com.google.gms.google-services'

what is the error message / logs? Can you post your code snippet? — Sachin Chandil
– Sachin Chandil, Commented Aug 9, 2017 at 19:18
MyActivity::class.java is the kotlin version. What are the error logs ? — Umar Farooque
– Umar Farooque, Commented Aug 9, 2017 at 19:24
At a first look, i guess you are missing classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.3-2" line in your project level build.gradle file. — Sachin Chandil
– Sachin Chandil, Commented Aug 9, 2017 at 19:50

Sachin Chandil · Accepted Answer · 2017-08-09 20:42:41Z

1

Try adding following changes in your gradle file.

Add classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.3-2" in your project build.gradle file.

build.gradle(:project)

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.0-beta1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.1.3-2" // New 
        classpath 'com.google.gms:google-services:3.0.0'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

...
...

And add

apply plugin: 'kotlin-android-extensions' apply plugin: 'kotlin-android'

two lines in app build.gradle file.

build.gradle(:app)

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android-extensions' // New 
apply plugin: 'kotlin-android' // New 

android {
    ...
    ...

    ...
    ...
}


dependencies {
    ...
    ...
}

apply plugin: 'com.google.gms.google-services'

This must solve your problem as i have updated My Android Studio to 3.0 beta 1 and having so issues.

I Hope this helps.

answered Aug 9, 2017 at 20:42

Sachin Chandil

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2 Comments

Robin Dijkhof Over a year ago

It doesn't make a difference. I even did a clean build. Any other suggestions?

Sachin Chandil Over a year ago

@RobinDijkhof dumb thing to ask but still : have you installed kotlin plugin?

Robin Dijkhof · Accepted Answer · 2017-08-16 16:14:31Z

1

I think this was an bug. I just updated to beta2 an the problem was solved.

answered Aug 16, 2017 at 16:14

Robin Dijkhof

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