Hi all I am having trouble with an object getting frozen in its

init

block and then top level value assignments causing an exception. heres a min example:

class Foo(bar: Bar) {
    init {
        CoroutineScope(Dispatchers.Default).launch { 
            bar.buzz()
        }
    }
    
    val a = 3
}

in the init block since bar is accessed, it seems like that is causing the entire foo object to also get frozen then when it gets to

val a = 3

during runtime - it complains about foo instance already being frozen. how can i go about fixing this?

Maybe try initiliazing

a

before launching the coroutine ?

If

bar

is just a constructor parameter and not a property of

Foo

(eg

val bar: Bar

) then I wouldn’t expect the whole

Foo

to get frozen by that init block.

Yep, agreed that I wouldn't expect the whole

Foo

to be frozen there.

just checked my actual code, looks like i reference a constructor parameter, as well as a constructor property (didn't show that in my simplified code), so I'm guessing thats why it is frozen

If you started from something like this

class Foo(val bar: Bar) {
    init {
        CoroutineScope(Dispatchers.Default).launch { 
            bar.buzz()
        }
    }
}

then you can refactor like this to avoid freezing

Foo

class Foo(bar: Bar) {
    val bar = bar // need to suppress a warning here
    init {
        CoroutineScope(Dispatchers.Default).launch { 
            bar.buzz()
        }
    }
}

thanks guys for the help! i was able to change the constructor property to just a parameter and that fixed this one. Russell thats a neat trick - i'm hoping i wont need to use that but good to know