According to some major newspapers in Japan, one of Japanese trading companies was raided by police of Kanagawa prefecture on November 29, 2011. The company name is Intertec Corporation (http://www.itcj.com/e/index.html) who is small company with about 50 employees, founded on 1994 with the capital amount JPY 100 millions, and sell semiconductor manufacturing equipments and parts.
The news paper report the company exported semiconductor manufacturing equipment with controlled software to China without required export license. It seems (simply my guess from limited news article) the items are likely to be controlled under Category 7 (16) and its related technology of Japanese export control list (or equivalent to Category 3B001 and 3D001 in US ECCN).
Also, the news article imply the goods and technology might be used for development of missile technology in China. If this is true, the case is also the violation of WMD catch-all control.
I find on Intertec's company web site they mainly sell "used" semiconductor equipment. As many of export control professionals know, the classification whether the used equipment is controlled or not is difficult and require special knowledge and skill. This operational challenge may be behind this violation case.