Japan has released its 2011 Defense White paper and a provisional translation is available on their website now. As noted in the report, China's rise in maritime capabilities and activities is of significant concern to Japan.
Previous years white papers are also available on their website and a nice compilation of White papers from other countries can be found at the NDU Library's MERLN White Paper site.
My many hats include: Outreach and Academic Support Manager & reference librarian at the Naval Postgraduate School's Dudley Knox Library and content manager for the Homeland Security Digital Library (HSDL). My subject areas include: Security Studies, Homeland Security, Intelligence, and Special Operations.