How do I make casting to BasicDBList?

Question

I have an ArrayList (json.get("pecas")) in which needs to be transformed into BasicDBList, I tried to turn on BasicDBObject before. How do I do that?

BasicDBList pecas = ((BasicDBList) json.get("pecas"));

Error

java.lang.ClassCastException: java.util.ArrayList cannot be cast to com.mongodb.BasicDBList

Answer 1

Use ArrayList's .addAll() see here for details

Here is an example of converting an ArrayList to a BasicDBList. I just used String since I don't know what type your ArrayList is. Make changes accordingly.

    BasicDBList dblist = new BasicDBList();
    // create arraylist to use
    ArrayList<String> alist = new ArrayList<String>();
    alist.add("blip");
    alist.add("bloop");
    alist.add("blap");

    dblist.addAll(alist); 

    System.out.println(dblist);
}