Draces's profile - activity

I wrote some code that detects faces and recognizes who that face is in C++ and then tried to implement this in Android using Java, only to find out that Eigenfaces aren't supported in the Java library. Does this lack of support in the Java libraries extend to the native code, or can I simply implement what i have written in C++ as native code? If so is there a good resource I could reference for converting it from regular C++ into native jni files?