kotlin-stdlib-jre7 is deprecated. Please use kotlin-stdlib-jdk7 instead

55
votes

Yesterday I updated Android Studio Version and Kotlin plugin version.

Android Studio Version: 3.1.2

Kotlin Version: 1.2.41

When I create an Android project using this configuration, I get Kotlin Compiler warning saying

w: /home/ganeshtikone/.gradle/caches/modules-2/files-2.1/org.jetbrains.kotlin/kotlin-stdlib-jre7/1.2.41/9e7a6f582de73d9cdc6c56ef4e23604a0ee55768/kotlin-stdlib-jre7-1.2.41.jar: kotlin-stdlib-jre7 is deprecated. Please use kotlin-stdlib-jdk7 instead

Changed as per suggestion, then I am getting following error

Unexpected inputs: ImmutableJarInput{name=org.jetbrains.kotlin:kotlin-stdlib-jre7:1.2.41, file=/home/ganeshtikone/Workspace/May-2018/fhs/app/build/intermediates/transforms/desugar/stage/debug/45.jar, contentTypes=CLASSES, scopes=EXTERNAL_LIBRARIES, status=REMOVED}

5
androidkotlin

5 Answers

92
votes

Go to Tools > Kotlin > Configure Kotlin Plugin Updates and check for updates then in your app gradle file replace jre with jdk 

implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
37
votes

Important Update

Must check JDK version before setting config

Kotlin gradle config page has detailed information about this.

First of all check your kotlin version in gradle file.

if (kotlin_version == '1.2.x' ) (Use jdk NOT jre)

First check your jdk version in File > Project Structure.

sc

Or check in build.gradle

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

if (jdk_version == 1.8)

implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"

if (jdk_version == 1.7)

implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

if (jdk_version is < 1.7)

implementation"org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"

else if(NO jdk version is set in Project Structure)

if(Android_Studio_Version < 2.2.1){
   your_jdk_version = 1.7;
}
else {
   your_jdk_version = 1.8;
}

Because Android Studio is bundled with jdk 1.8 since 2.2.1 version.

2. else if ( kotlin_version == '1.1.x') (Use jre NOT jdk)

implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version" // or jre8

Update Kotlin Version?

You can update Kotlin version from Tools > Kotlin > Configure Kotlin Updates

9
votes

Something is transitively importing those libraries. Run Gradle task dependencies to figure out what.

In my case, it was io.vertx:vertx-lang-kotlin-coroutines:3.5.1.

If there is no update for the dependency, there is not much you can do about it

6
votes

After reading Kotlin Gradle Script Topic I find out that some ponits

If you're targeting JDK 7 or JDK 8, you can use extended versions of the Kotlin standard library which contain additional extension functions for APIs added in new JDK versions. Instead of kotlin-stdlib, use one of the following dependencies:

compile "org.jetbrains.kotlin:kotlin-stdlib-jdk7"
compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8"

I used implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8" in my project. I think it's because of compileOptions set in build.graddle

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}
0
votes

You must swap the codes below:

     implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"

Not jre > jdk

     implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"