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

Question

As per mentioned in developer.android website

"The Jack toolchain is deprecated, as per this announcement. If your project depends on Jack, you should migrate to using Java 8 support built into Android Studio’s default toolchain."

I need to use lambda expressions so I have disabled the jack options, but when I compile my code, I get the following error

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

Below is the screenshot of my build.gradle file

Raconteur

Answer 1

Check you version of com.android.tools.build:gradle.

I had the same error. My solution:

• set com.android.tools.build:gradle:3.0.0-alpha6
• update kotlin to 1.1.3-2
• add to repositories google()

I'm using AS 3.0 Canary 6.

Mallon

what if we don't use the beta version of AS, no workaround on this? – Eltonelucidate

Answer 2

You should do the following:

• Update your Android Studio to version 3.0.1.

• Upgrade your gradle to 'com.android.tools.build:gradle:3.0.1'

• Make sure you buildToolsVersion is at least 26.0.2.

After that you can remove Jack options and use supported Java 8 features.

Centigrade