Null Point Exception

I am getting a null point error and my code doesn't work. It doesn't check if I have a enchanted book named something.
Error

Code:

2013-01-21 02:41:23 [SEVERE] Could not pass event PlayerInteractEvent to Magic Book v1.0
org.bukkit.event.EventException
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
    at org.bukkit.craftbukkit.v1_4_6.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:178)
    at net.minecraft.server.v1_4_6.PlayerInteractManager.interact(PlayerInteractManager.java:376)
    at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:656)
    at net.minecraft.server.v1_4_6.Packet15Place.handle(SourceFile:58)
    at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)
    at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:112)
    at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
    at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:598)
    at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:224)
    at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
    at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
    at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
    at Listener.MagicListener.onInteract(MagicListener.java:28)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    ... 16 more

Code

Code:

package Listener;
 
import me.Magic.Magic;
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.entity.SmallFireball;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
 
public class MagicListener implements Listener {
    private Magic plugin;
 
    public MagicListener(Magic plugin) {
        this.plugin = plugin;
    }
 
    @EventHandler
    public void onInteract(PlayerInteractEvent e) {
        Player p = e.getPlayer();
        ItemStack hand = p.getItemInHand();
        ItemMeta newStick = hand.getItemMeta();
        if (hand.getTypeId() == 280
                && newStick.getDisplayName().equals("Wand") && hand.getType() != null) {
            if (e.getAction() == Action.RIGHT_CLICK_AIR
                    || e.getAction() == Action.RIGHT_CLICK_BLOCK) {
                int Slot = 0;
                while (p.getInventory().getItem(Slot) != new ItemStack(
                        Material.BOOK) && Slot < 35) {
                    Slot++;
                }
                if (p.getInventory().getItem(Slot) == new ItemStack(
                        Material.ENCHANTED_BOOK)) {
                    ItemStack book = p.getInventory().getItem(Slot);
                    ItemMeta newBook = book.getItemMeta();
                    if (newBook.getDisplayName().equals("Spell Book of Fireball")
                            && !(newBook.hasEnchants())) {
                        p.getInventory().remove(Slot);
                        if (p.getFoodLevel() > 2) {
                            p.setFoodLevel(p.getFoodLevel() - 2);
                            p.sendMessage("You have casted Fireball!");
                            SmallFireball fireball = p
                                    .launchProjectile(SmallFireball.class);
                            fireball.setShooter(p);
                            fireball.setYield(2);
                            fireball.setBounce(false);
                        } else {
                            p.sendMessage(ChatColor.RED
                                    + "Your current mana level is too low to cast this spell");
                        }
                    }
                    if (newBook.getDisplayName().equals("Spell Book of Health")
                            && !(newBook.hasEnchants())) {
                        p.getInventory().remove(Slot);
                        if (p.getFoodLevel() > 10) {
                            if (p.getHealth() < 12) {
                                p.setHealth(20);
                            }
                            if (p.getHealth() > 12) {
                                p.setHealth(p.getHealth() + 8);
                            }
                            p.setFoodLevel(p.getFoodLevel() - 15);
                            p.sendMessage("You have casted Regen!");
                        } else {
                            p.sendMessage(ChatColor.RED
                                    + "Your current mana level is too low to cast this spell");
                        }
                    }
                }
                else{
                    p.sendMessage("You need " + ChatColor.BLUE + "Spell Books" + ChatColor.WHITE + " to use the wand!");
                }
            }
        }
    }
}

 

"hand" doesn't have a display name. Add a check for that first using hand.hasDisplayName()

 

Also, check if hand.getType is null before checking if hand.getTypeId == 280.

 

RealDope
It works, when I right click with a stick named "Wand" but when I get this error when I right click with a normal stick. Also when I do it, it doesn't detect the Enchanted Book.

 

Yes because when you right click with a regular stick it doesn't have a display name. You have to do the check like I told you.