Unsupported major.minor version 52.0

[mradzinski]

Whenever adding the plugin to Android Studio I get:
Error:(2, 0) Cause: me/tatarka/RetrolambdaPlugin : Unsupported major.minor version 52.0

Andriod Studio 0.8.6
Gradle Build Tools 20.0.0

[dbachelder]

You need to start AS with JDK8 set as JAVA_HOME... just got through the same problem.

[mradzinski]

Actually setting classpath 'me.tatarka:gradle-retrolambda:2.2.2' to version 2.2.1 solves the issue. It seems this was introduced in the 2.2.2 version.

[evant]

@mradzinski could you tell me what java.home is set to when you run from Android Studio? Version 2.2.2 was my attempt to fix a case where I was getting an unexpected path, but I may have made it worse instead of better.

[dbachelder]

When it was set to /Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/Home it doesn't work for me.

when it's set to /Library/Java/JavaVirtualMachines/jdk1.8.0_11.jdk/Contents/Home it does work

[mradzinski]

JAVA_HOME: C:\Program Files\Java\jdk1.7.0_45
JAVA8_HOME: C:\Program Files\Java\jdk1.8.0_11

right now I'll try to set JAVA_HOME to use JDK8 and JAVA7_HOME for JDK7, let's see if that makes the trick.

[mradzinski]

Still throws the error after setting JAVA_HOME to C:\Program Files\Java\jdk1.8.0_11.

By using JAVA_HOME for JDK8 and JAVA7_HOME for SDK7 I managed to make it work, but still have to use version 2.2.1 instead of 2.2.2.

Found out also that compileOptions doesn't work anymore. It resets my language to 1.7.

Here's my app.gradle file:

buildscript {
    repositories {
        mavenCentral()
    }

    dependencies {
        classpath 'me.tatarka:gradle-retrolambda:2.2.1'
    }
}

apply plugin: 'retrolambda'
apply plugin: 'com.android.application'

retrolambda {
    jdk System.getenv("JAVA_HOME")
    oldJdk System.getenv("JAVA7_HOME")
    javaVersion JavaVersion.VERSION_1_7
}

android {
    compileSdkVersion 19
    buildToolsVersion '20.0.0'

    compileOptions {
       sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    defaultConfig {
        applicationId "com...."
        minSdkVersion 14
        targetSdkVersion 19
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
       release {
           runProguard false
           proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
       }
   }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.netflix.rxjava:rxjava-android:0.20.0-RC6'
}

[evant]

It's supposed to work both ways. @mradzinski could you test with version 2.2-SNAPSHOT? Instructions are in the README for the develop branch.

[mradzinski]

2.2-SNAPSHOT works, it doesn't throws the Unsupported major.minor version 52.0 error. Looks like you changed it to use localGroovy()... perhaps was a groovy issue?

[evant]

Aha! I changed the dependency from localGroovy() to org.codehaus.groovy:groovy-all:2.3.3 because it was failing if I built it with gradle 2.0. Looks like that caused more issues than it solved. I'll push a release changing that back and make sure to build with gradle 1.x for now.

[mradzinski]

ehmmm... maybe a little late, but... maybe forgot to mention classpath 'com.android.tools.build:gradle:0.12.2'

[evant]

Alright, fixed in 2.2.3, please allow time to sync. @dbachelder You said your having an issue with using JAVA_HOME=java7 and JAVA8_HOME=java8? If so, could you open a new issue? That is supposed to work.

[dbachelder]

@evant I'll try the 2.2.3 and let you know if the problem persists.

[mradzinski]

Sounds just right! let's close this issue now and forever :)
Thanks both

[Orabig]

I had this issue too, but making the JAVA_HOME point to JDK8 was not sufficient.
There is a (slightly hidden) parameter in Android Studio to change, hidden at File->Other Settings->Default Project Structure->SDKs
The solution was here : [http://stackoverflow.com/questions/16823790/android-studio-dont-know-where-is-java]