Util Force open a book

I was roaming the internet for an actual util to open a book that's non-version dependent, clear to read, and would run the best. I couldn't find one that fit all three, so I made a one. Here's the code, the usable part is one method that accepts a player and itemstack and opens the book. (If you're wondering why I use the depreciated methods it's for backwards compatibility. If you would like to remove them, just add Main when you get and set the main hand.)

Code (open) Code (close)

Code:

import java.lang.reflect.Method;

import org.bukkit.Bukkit;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;

public class OpenBook {

    private static Class<?> _CRAFTPLAYER_CLASS;
    private static Method _GETHANDLE_METHOD, _A_METHOD;
    private static Object _ITEMSTACK, _MAIN_HAND;

    static {
        String name = Bukkit.getServer().getClass().getName();
        name = name.substring(name.indexOf("craftbukkit.") + "craftbukkit.".length());
        final String _VERSION = name.substring(0, name.indexOf("."));
        try {
            _CRAFTPLAYER_CLASS = Class.forName("org.bukkit.craftbukkit." + _VERSION + ".entity.CraftPlayer");
            Class<?> _ITEMSTACK_CLASS = Class.forName("net.minecraft.server." + _VERSION + ".ItemStack");
            Class<?> _ENUMHAND_ENUM = Class.forName("net.minecraft.server." + _VERSION + ".EnumHand");

            _GETHANDLE_METHOD = _CRAFTPLAYER_CLASS.getMethod("getHandle");
            _A_METHOD = Class.forName("net.minecraft.server." + _VERSION + ".EntityPlayer").getMethod("a",
                    _ITEMSTACK_CLASS, _ENUMHAND_ENUM);

            for (Object obj : _ENUMHAND_ENUM.getEnumConstants()) {
                if (obj.toString().equals("MAIN_HAND")) {
                    _MAIN_HAND = obj;
                    break;
                }
            }

            _ITEMSTACK = _ITEMSTACK_CLASS.getConstructor(Class.forName("net.minecraft.server." + _VERSION + ".Item"))
                    .newInstance(Class.forName("net.minecraft.server." + _VERSION + ".Items").getField("WRITTEN_BOOK")
                            .get(null));
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }

    @SuppressWarnings("deprecation")
    public static void openBook(Player player, ItemStack book) {
        ItemStack itemInHand = player.getInventory().getItemInHand();
        player.getInventory().setItemInHand(book);
        try {
            Object craftPlayer = _CRAFTPLAYER_CLASS.cast(player);
            Object entityPlayer = _GETHANDLE_METHOD.invoke(craftPlayer);
            _A_METHOD.invoke(entityPlayer, _ITEMSTACK, _MAIN_HAND);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        player.getInventory().setItemInHand(itemInHand);
    }
}

Any questions or suggestions would be appreciated.

UPDATE: I changed the some of the fields in the class so it doesn't waste as much ram.