I suggest you get a IDE, Netbeans or Eclipse. It will make your life easier.
Notes About The Client:
IP Addresses Are NOT 127.0.0.1 but their IP. Updated Client Will Have that updated.
Download The 614http://www.mediafire.com/download.php?tgxyn301f3xhbpcYou will need this for the client and for the server.
Extract it to C:/
Name the folder the files are in 614cache, take all the files within the runescape folder and put it in the main folder so it looks like this:
C:/614cache/main_file_cache.dat0
Fixing NullPointerException Cache Loading Error
Change PATH in dragonkk.rs2rsps.util.CacheConstants
public final static String PATH = "C:/614cache/";
That should load the cache files from the cache you client should be loading.