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How would you write this MongoDB query using Java driver :

db.customers.find({'arrayName' : {$exists:true}, $where:'this.arrayName.length>0'})

Cheers, Yann

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    I would not use this query - it's a bad idea to use $where. Do a regular find with {arrayName.0:{$exists:true}} Commented Aug 5, 2014 at 13:42
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    Did you have a look at the API doc? Maybe you should be more precise if something there is not clear to you or does not work when you try. Commented Aug 5, 2014 at 14:10

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To build a query with the Java driver, you substitute any Javascript objects with DBObject's.

DBObject condition = new BasicDBObject();
condition.put("arrayName", new BasicDBObject("$exists", true));
condition.put("$where",  "this.arrayName.length>0");

DBCursor result = yourDatabase.getCollection("customers").find(condition);
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