Hi is there any adjustment need to be done when us...

# k2-adopters

[Doni Winata]

Hi is there any adjustment need to be done when using k2?
i got error

Symbol public final static field EVENT_ID: R|kotlin/String| = String(event_id)
is invisible
any clue ? thank you

[dmitriy.novozhilov]

Could you please provide more details?
How is this field is declared?
How it is accessed?

[Doni Winata]

This is the field from android
https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/provider/CalendarContract.java

public final class CalendarContract {
  protected interface AttendeesColumns {
    String ATTENDEE_EMAIL = "attendeeEmail";


  }
}

[dmitriy.novozhilov]

And how do you access it?
From same module/from other module?
How is it imported, is call-site in same package as CalendarContract or not?

[Doni Winata]

val cRingtone: Boolean = cur.getString(cur.getColumnIndex(ContactsContract.Contacts.CUSTOM_RINGTONE))?.length ?: 0 > 0

it is imported

import android.provider.ContactsContract

Because im using android library plugin so able to import it

[Doni Winata]

i will try to create reproducable project later and report this one.

Btw i got another error after ingnoring those class, now error on another module: 'com.traveloka.android.common.localization.provider.LocaleProvider' is compiled by the new Kotlin compiler frontend
and cannot be loaded by the old compiler

Do i need to enable k2 on all module ?

[dmitriy.novozhilov]

This issue is known and fixed in 1.8.20
https://youtrack.jetbrains.com/issue/KT-54921

[dmitriy.novozhilov]

Do i need to enable k2 on all module ?

Yes

[Doni Winata]

so this mean i need to remove kapt from my project to use k2 ?

[dmitriy.novozhilov]

K2 compiler is not stable, which means that we can not guarantee that ABI of same code won't change between compilation with 1.8 and 1.9. So because of that we mark all binaries compiled with K2 as unsatable, to prevent leaking it into production code
Since kapt is not supported by K2 yet you can add -Xallow-unstable-dependencies to modules with kapt
This arg allows compiler to depend on unstable binaries
But be careful and don't publish such binaries to users

[dmitriy.novozhilov]

Those cautions are more relevant for library authors, but I steel must to warn about them

[Doni Winata]

ah okay thanks. is there any article to show how much improvement when using k2 ?

[dmitriy.novozhilov]

All user-visible improvements are mostly in performance of compilation
In regular compilations we observe 2x-2.5x performance boost comparing with current compiler

If you are interested in real compiler/language changes (which are mostly bug/architecture/design fixes) you can check YT tickets with fixed-in-k2 tag

[Doni Winata]

noted, thank you for info

[Doni Winata]

I put sample project to repro on this issue tracker
https://youtrack.jetbrains.com/issue/KT-55571/K2-Error-Symbol-public-final-static-field-is-invisible