java.lang.OutOfMemoryError through Iterator.collectEntries and others (part 2: handle others)

DGM.collectEntries(Iterator, ...) naively calls toList(Iterator<T> self) to convert the Iterator to a list. There's no need to do this since iterator suffices to collect the entries. Even worse, toList uses ArrayList what may lead to multiple reallocations when the ArrayList's capacity must be enlarged.

Error:
Caught: java.lang.OutOfMemoryError: GC overhead limit exceeded

The same problems may occur when calling other methods that internally convert Iterator to lists.