What types is supported by Solrj addBean() in the fields of POJO objects?

[T. Kuro Kurosaka]

What are supported types of the POJO objects that are sent to 
SolrServer.addBean(obj)?
A quick glance of DocumentObjectBinder seems to suggest that
an arbitrary combination of an Collection, List, ArrayList, array ([]), Map, 
Hashmap,
of primitive types, String and Date is supported, but I'm not too sure. I would 
also
like to know what Solr field types are allowed for each object's (Java) field 
types.
Is there documentation explaining this?
Kuro