java.lang.ClassCastException: com.mongodb.BasicDBList cannot be cast to scala.collection.immutable.List with a List inside a Map

[Miguel Angel Iglesias]

I've seen this problem over and over again in the group and in the issues, apparently it should be solved, but for some reason I have the problem.

My thing is really straightforward:

The field in question has this form by default,

{ "1" : [ ] , "2" : [ ] , "3" : [ ] , "4" : [ ] , "5" : [ ] , "6" : [ ] , "7" : [ ]}

those [] are actually meant to contain an array of elements like this one: {"start": 12121,"end": 12121}

The problem is happening with the empty arrays, don't know if it will occur with data in the arrays, haven't have time to mock it up.

The case class for what goes inside the arrays is:

case class MidnightRange(start: Int,end: Int)

and the map is declared like this:

Map[String, List[MidnightRange]]

Any idea of what can be going on?

[Anton Stamov]

четверг, 31 июля 2014 г., 23:58:59 UTC+3 пользователь Miguel Angel Iglesias написал:

I have the similar problem, but with List[List[Double]: 

I have the following structure:

case class A(list: List[List[Double]])

case class B(a: A)

case class C(id: ObjectId, b:B)

when I trying to get from Mongo saved object with type of C and get access to list (something like c.b.a.list.head) I get ClassCastException: com.mongodb.BasicDBList cannot be cast to scala.collection.Traversable

What can be cause of this? 

[rose katherine toomey]

Please see https://github.com/salat/salat/wiki/Collections

Nested lists are not supported.

Maps whose values are lists are not supported.

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