Store an array using MongoDB and Java

Question

I am saving a BasicDBObject in my mongoDb collection

BasicDBObject[] aBox = new BasicDBObject[5];
BasicDBObject obj = new BasicDBObject();
obj.append("box", aBox);

for the moment this is a void array so I have just [] in my collection

but when I am trying to get my array

DBObject[] aBox = (DBObject[]) obj.get("box");

I have this error

java.lang.ClassCastException: com.mongodb.BasicDBList cannot be cast to [Lcom.mongodb.DBObject;

Do you know how to have my array?

assylias · Accepted Answer · 2013-05-08 16:01:33Z

1

BasicBDList is a List and therefore has a toArray method. Or you could just keep it as a list. Something like this should work:

List<BasicDBObject> list = (List<BasicDBObject>) obj.get("box");
BasicDBObject[] aBox = list.toArray(new BasicDBObject[list.size()]);

answered May 8, 2013 at 16:01

assylias

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1 Comment

Thanks for your help, s I can also directly save list I have not to convert to array before saving