I was looking for Oracle support and got a response from oracle like the following. This was very helpful for me, hope it helps someone else.

Oracle Express Edition (XE) is not supported by normal Oracle Support Services because it is distributed at no charge.

The support for Oracle XE is done via a forum on OTN for which you have to register first.
This is documented in the FAQ accessible via
http://www.oracle.com/technology/products/database/xe/pdf/dbxe_faq.pdf
or
http://www.oracle.com/technetwork/products/express-edition/overview/index.html

Please refer to the next statement from above references:
“Support is provided through a free Oracle Discussion Forum monitored by Oracle employees as well as community experts.”

You can refer the below note for more details.
Where To Get Support For Oracle Express Edition (XE) ? (Doc ID 352768.1)