Hi I found that kapt would generate some stub with

@android.annotation.TargetApi(value = null)

in my project and it would cause build fail. does anyone know how to avoid it?

In your code are you calling @TargetApi , without putting the actual API level

in my kotlin file, the function is

@TargetApi(Build.VERSION_CODES.LOLLIPOP_MR1)
    fun isAsynchronous(isAsynchronous: Boolean): MessageBuilder = apply {
        this.isAsynchronous = isAsynchronous
    }

But in the generated java it is

@org.jetbrains.annotations.NotNull()
    @android.annotation.TargetApi(value = null)
    public final com.linecorp.lineat.android.util.MessageBuilder isAsynchronous(boolean isAsynchronous) {
        return null;
    }

Are you sure that constant isnt null

yes, constant value works but

Build.VERSION_CODES.LOLLIPOP_MR1

is in android sdk. that is the weird thing…