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

Question

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}

Ali · Accepted Answer · 2022-08-16 15:12:13Z

98

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"

Update

Newer version is jdk8

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

edited Aug 16, 2022 at 15:12

Ali

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answered May 21, 2018 at 10:31

Aman Saxena

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2 Comments

IgorGanapolsky Over a year ago

Why not org.jetbrains.kotlin:kotlin-stdlib-jdk8?

Shubham AgaRwal Over a year ago

@IgorGanapolsky Would you like to answer your comment. Thanks in Advance

Khemraj Sharma · Accepted Answer · 2019-01-24 08:56:31Z

39

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.

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

edited Jan 24, 2019 at 8:56

answered Oct 1, 2018 at 6:50

Khemraj Sharma

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4 Comments

Santanu Sur Over a year ago

I am using jdk8 and latest kotlin version ie. 1.3.11 but still the warning shows .. jre7 is deprecated.. P.S my android studio version is 3.3.0

Khemraj Sharma Over a year ago

@SantanuSur I am not sure. Perhaps, check if any of your dependency is using that version?

Santanu Sur Over a year ago

Yes I am using some open source libs..might be one of'em

Khemraj Sharma Over a year ago

@SantanuSur You can check if there is some update from your libraries.

Nikola Mihajlović · Accepted Answer · 2018-05-29 00:18:59Z

9

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

answered May 29, 2018 at 0:18

Nikola Mihajlović

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Comments

tynn · Accepted Answer · 2018-05-15 17:39:16Z

7

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
}

edited May 15, 2018 at 17:39

tynn

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answered May 15, 2018 at 8:54

Ganesh Tikone

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Comments

samet kaya · Accepted Answer · 2018-11-26 21:09:34Z

1

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"

answered Nov 26, 2018 at 21:09

samet kaya

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Comments

Christian Grandez · Accepted Answer · 2022-02-19 15:39:36Z

1

Change SDK7 to Java SDK8 try this:

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

}

answered Feb 19, 2022 at 15:39

Christian Grandez

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

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Important Update

Must check JDK version before setting config

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

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

Update Kotlin Version?

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6 Answers 6

Update

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Important Update

Must check JDK version before setting config

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

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

Update Kotlin Version?

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

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