Schema cache in SpecificData

[Vyacheslav Zholudev]

Hi,

maybe a simple question. But is it ok if schemaCache in SpecificData contains 
an entry:
class 
java.util.ArrayList={"type":"record","name":"ArrayList","namespace":"java.util","fields":[]}

I thought any type of collection should get an array schema type.

I'm using avro 1.6.1

Vyacheslav