Kotlin: For-loop must have an iterator method – is this a bug?

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Your ArrayList is of nullable type. So, you have to resolve this. There are several options:

for (p2 in list.orEmpty()) { ... }

or

 list?.let {
    for (p2 in it) {

    }
}

or you can just return an empty list

public fun findSomeLikeThis(): List<T> //Do you need mutable ArrayList here?
    = (Db4o.objectContainer()!!.queryByExample<T>(this as T) as Collection<T>)?.toList().orEmpty()

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