Using solrJ to get all fields in a particular schema/index

[Rakhi Khatwani]

Hi,
           Is there any way to get all the fields (irrespective of whether
it contains a value or null) in solrDocument.
or
Is there any way to get all the fields in schema.xml of the url link (
http://localhost:8983/solr/core0/)??

Regards,
Raakhi