java - How to write the Criteria(Query) for MongoDB -


i have written mongo query in robomongo , want write query criteria , query 

db.getcollection('collection').find({"_class": "a", devices : {$exists:true}, $where:'this.devices.value.length>0'})

in java writing 

final query query = query.query(criteria.where("_class").is(typealias).and("devices").exists(true).and("devices.value.length>0"));

but, not working. can guide me on this?


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