If limit is 1, and batchsize is 0, DBApiLayer.chooseBatchSize will return -1, and the cursor will be closed as a result.

in DBApiLayer.chooseBatchSize, I see
if (res == 1)

{ // optimization: use negative batchsize to close cursor res = -1; }

Code to replicate
I have 4 entries in the collection

DB m = Mongo.connect(new DBAddress("host", "dbname"));

DBCursor c1 = m.getCollection("mycoll").find();
int count1 = 0;
while (c1.hasNext())

{ c1.next(); count1++; }

System.out.println("Count 1 is: " + count1);

DBCursor c2 = m.getCollection("buttons").find().skip(2).limit(1);
int count2 = 0;
while (c2.hasNext())

{ c2.next(); count2++; }

System.out.println("Count 2 is: " + count2);

Output:
Count 1 is: 4
Count 2 is: 0