'Compilation failed: lambda expressions are not supported in -source 6 (use -source 8 or higher to enable lambda expressions) in Android Debugger

i'm trying to using the Optional to null-checking and get JsonObject using Gson

 final User user = RequestUtils.customDeserializerGson().fromJson(json, User.class);
        Optional<JsonElement> jsonAvatar = Optional.ofNullable(json)
                .filter(je -> je.isJsonObject())
                .map(je -> je.getAsJsonObject())
                .map(jso -> jso.get("avatar"))
                .filter(jeAvatar -> jeAvatar.isJsonObject());

    if ((user.getAvatar() == null) && jsonAvatar.isPresent()) {
        UserAvatar avatar = RequestUtils
                .customDeserializerGson()
                .fromJson(jsonAvatar.get(), UserAvatar.class);

        user.setUserAvatar(avatar);
    }

When i'm debugging the Optional part and try to add an expression containing a lambda expression:

Optional.ofNullable(json).filter(je -> je.isJsonObject())

, it can't show the result and said "Compilation failed: lambda expressions are not supported in -source 6 (use -source 8 or higher to enable lambda expressions)"

Here the image for it: enter image description here

I have enabled to use the Java 8+ API desugaring support base on https://developer.android.com/studio/write/java8-support#library-desugaring to use Optional feature, but its weird that its not work in Android Debugger, can anyone help me ?

javaandroidandroid-studio


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