CJK TureType font has only one Font style: normal normal, because of LARGE CHARACATER SET. So FOP can not render a italic font using a Normal Normal font. In Java2, Local fonts can be used, and you can create a Italic font derive from a normal font. And so in Arcobat on windows. Can FOP extends such ability in farther version?? I understand that FOP can not transform Font Style automatically, it may be due to some other Error(??).
FOP only uses Java's font subsystem for the AWT Renderer. The other renderers use their own font subsystem. The AWT fonts suffer from several deficiencies where the most problematic is the fact that the behvaiour is inconsistent over JDK versions. I'm pretty sure that if you want to wait for FOP to implement such a functionality for the PDF renderer, for examples, you have to be prepared to wait for a long time. The other solution is: you implement it yourself. You'll be better off finding another font that has italic characters. Please close this bug if you find a work-around and you don't think this is very important.
*** This bug has been marked as a duplicate of bug 39293 ***
batch transition resolved+duplicate to closed+duplicate