Cannot find symbol error

Im trying to make my first mod, which was going to just be a mod of http://www.minecraftforum.net/viewtopic.php?f=25&t=61032 , but I cant even get that to compile. I keep getting errors about not being able to find aj(vector). Ive programmed in other languages(C++,etc), but I havent touched java in 5 years. I assume that it should be looking in minecraft.jar or one of the classes in that(I tried extracting them all), but its not finding anything. Im compiling with
javac -g -cp bin\minecraft.jar;bin\jinput.jar;bin\lwjgl.jar;bin\lwjgl_util.jar;minecraft -sourcepath src -d minecraft src\*.java
all the paths are correct