How to convert mongo shell code to java code using document and mongo aggregation

Question

How can I convert this code to java? How to use aggregation framework in java ? Can anyone please help me out...

My java code:

Document update = new Document("$project",new Document("TOTAL_EMPLOYEE_SALARY",new Document("$sum","$employees.EMP_SALARY")));
 AggregationOutput output = coll.aggregate(update); // throwing some error in eclipse

My mongo shell code :

db.collection.aggregate([
    { "$project": {
        "TOTAL_EMPLOYEE_SALARY": {
           "$sum": "$employees.EMP_SALARY"
        }
    }}
])

Actually eclipse is not allowing me to write this line:AggregationOutput output = coll.aggregate(update); .It is asking for cast argument 'update' to List<? extends BSON> — dev777
– dev777, Commented Apr 22, 2016 at 8:26

Neil Lunn · Accepted Answer · 2016-04-22 08:36:59Z

1

So use a List:

List<Document> pipeline = Arrays.<Document>asList(
    new Document("$project",
        new Document("TOTAL_EMPLOYEE_SALARY",new Document("$sum","$employees.EMP_SALARY"))
    )
);

AggregationOutput output = coll.aggregate(pipeline);

answered Apr 22, 2016 at 8:36

Neil Lunn

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