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MongoIterable.forEach requires a Block which is very similar to Java 8 Consumer . They are similar enough to cause problems, for example, the following doesn't compile:

MongoIterable<Document> result = collection.find(...);
result.forEach(System.out::println); 
because the compiler can't decide between Iterable.forEach( Consumer )  and MongoIterable.forEach( Block ). Fixing this requires workarounds like explicitly typing the parameter:
Block<Document> printer = System.out::println;
result.forEach(printer);   
or alternatively, treating MongoIterable as a plain Stream:
StreamSupport.stream(result.spliterator(), false).forEach(System.out::println);
Why is MongoIterable.forEach not defined using the Consumer interface, something like: MongoIterable.forEach(Consumer<? super TResult> consumer)? Even better - why have forEach in MongoIterable at all? 
                This explains why Consumer is not used, but I am still not clear as to why have MongoIterable.forEach in the first place. Is it to give non Java 8 users a Java 8 like experience ?
– David Soroko
                Jan 8, 2016 at 9:23
                It was intended to make it more friendly.  The jury's still out if that goal was achieved or not.
– evanchooly
                Jan 10, 2016 at 21:52
                It would have been nice to have a different name to avoid the name class, like forEachMongo (or maybe an even cooler name?). Luckily a simple type cast solves the issue.
– Freek de Bruijn
                Nov 5, 2016 at 21:13
        
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