The report is somewhat contradictory saying:
"The report said that during the first six months of 2007, Japan's National Police Agency detected as many as 2,112 hacker attacks from China on a single day."and then says:
"Japanese agencies have not detected attacks by Chinese on their networks but some experts say the Chinese conducted clandestine break-ins that left no traces."The report also discusses Japanese concerns that a large number on Chinese IT technicians working in Japan increase the risk of cyber attacks both by the Chinese government and individuals.
China Military Hackers Strike Again, This Time in Japan (requires sign-in)