Migrating from Jack to native Java 8

I'm trying to use lambda expressions and streams in my android project I use the streamsupport library as a stream and native Java 8 for lambda expressions In order to be able to use the Java 8 features I need to add

compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

This code is in my gradle, but the compiler shows this error:

Error:Jack is required to support java 8 language features. Either enable Jack or remove sourceCompatibility JavaVersion.VERSION_1_8.

Then I added this

jackOptions {
    enabled true
}

And the compiler has no errors, but at run time, the same errors are constantly displayed This is my fool

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.3"

    defaultConfig {
        applicationId "home.gio.calorieplanner"
        minSdkVersion 16
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

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

dependencies {
    compile fileTree(include: ['*.jar'],dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2',{
        exclude group: 'com.android.support',module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.3.1'
    compile 'com.android.support:recyclerview-v7:25.3.1'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.android.support:support-v4:25.3.1'
    compile 'org.greenrobot:eventbus:3.0.0'
    compile 'com.android.support:design:25.3.1'
    compile 'com.google.firebase:firebase-crash:10.0.1'
    compile 'com.google.code.gson:gson:2.8.0'
    compile 'com.google.firebase:firebase-database:10.2.4'
    compile 'com.google.firebase:firebase-core:10.2.4'
    compile 'com.jakewharton:butterknife:8.5.1'
    compile 'com.firebaseui:firebase-ui-database:1.1.0'
    compile 'org.jsoup:jsoup:1.10.2'
    compile 'com.android.support:percent:25.3.1'
    compile 'com.thoughtbot:expandablecheckrecyclerview:1.4'
    testCompile 'junit:junit:4.12'
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.5.1'
    compile 'net.sourceforge.streamsupport:streamsupport:1.5.4'
}



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

This is how I use lambda expressions and streams

public String identifySubMenu(String group,int index) {
    List<Product> prod = StreamSupport
            .stream(Main.outRetailChainList.get(Constants.GOODWILL).getProducts())
            .filter(item -> item.getCategory().equals(group))
            .collect(Collectors.toList());
    return prod.get(index).getSubMenu();
}

So my question is how to solve this error

Solution

You have many choices:

1 – upgrade your Android studio version to 3.0. This version no longer requires a jack. Now handle lambda correctly, but this version is on the Canary channel. This is their "beta" version

2 – don't use lambda now and wait for 3.0 release, because Jack can't handle lambda completely correctly You have a full explanation page: https://developer.android.com/guide/platform/j8-jack.html

3 - use a plug-in called retrorambda, but this will increase compilation time In my opinion, this option is too heavy for lambda