Solved Assistance with new plugin.

Hello, everyone! I'm not new to plugin making, but I am new to the listeners in Bukkit, and as such, I am running into a problem that I don't know how to fix. The point of my plugin is to restrict what items you can hold, use, interact with, etc, but (obviously) I ran into trouble and need some help from the Bukkit community.

Here's my main class (ItemStackRestrictor.java):

Code:java

package com.thetruecolonel.plugin;
 
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;
 
public class ItemStackRestrictor extends JavaPlugin {
@Override
public void onEnable() {
new ItemListener(this);
 
getLogger().info("Plugin has been enabled.");
}
 
@Override
public void onDisable() {
getLogger().info("Plugin has been disabled.");
}
 
@Override
public boolean onCommand(CommandSender sender, Command cmd,
String label, String[] args) {
 
int version;
version = (int) 1.0;
 
if(sender instanceof Player) {
Player player = (Player) sender;
if(cmd.getName().equalsIgnoreCase("ItemRestrictor")
|| cmd.getName().equalsIgnoreCase("IR")) {
if(args.length == 0) {
player.sendMessage(ChatColor.AQUA + "Item Restrictor version: "
+ ChatColor.GOLD + version + ChatColor.AQUA + "!");
}
}
}
 
return false;
}
}
 

And here is my listener class (ItemListener.java):

Code:java

package com.thetruecolonel.plugin;
 
import org.bukkit.ChatColor;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;
 
public class ItemListener implements Listener {
 
public boolean needsChange;
 
public ItemListener(ItemStackRestrictor plugin) {
plugin.getServer().getPluginManager().registerEvents(this, plugin);
}
 
@EventHandler
public void inventoryListener(PlayerInventory e, Player p) {
Player player = p.getPlayer();
 
if(player.hasPermission("isr.wSword")) {
if(e.getItemInHand().isSimilar(ItemStack(Material.WOOD_SWORD))) {
Material item = e.getItemInHand().getType();
 
needsChange = true;
player.sendMessage(ChatColor.RED + "You cannot use that " + item + "!");
slotChange(e);
}
}
}
 
public void slotChange(PlayerInventory e) {
int change = e.getHeldItemSlot() - 1;
 
if(needsChange) {
if(change == -1) {
e.setHeldItemSlot(8);
} else if(change != -1) {
e.setHeldItemSlot(change);
}
}
}
 
private ItemStack ItemStack(Material material) {
throw new UnsupportedOperationException("Not supported yet.");
}
 
}

And I get this error:

Code:

[19:12:44] [Server thread/ERROR]: Could not load 'plugins/Inventory_Restrictor.jar' in folder 'plugins'
org.bukkit.plugin.InvalidPluginException: java.lang.UnsupportedClassVersionError: com/thetruecolonel/plugin/ItemStackRestrictor : Unsupported major.minor version 52.0
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:131) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at org.bukkit.plugin.SimplePluginManager.loadPlugin(SimplePluginManager.java:328) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at org.bukkit.plugin.SimplePluginManager.loadPlugins(SimplePluginManager.java:251) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at org.bukkit.craftbukkit.v1_7_R4.CraftServer.loadPlugins(CraftServer.java:364) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at org.bukkit.craftbukkit.v1_7_R4.CraftServer.(CraftServer.java:326) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at net.minecraft.server.v1_7_R4.PlayerList.(PlayerList.java:68) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at net.minecraft.server.v1_7_R4.DedicatedPlayerList.(SourceFile:14) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at net.minecraft.server.v1_7_R4.DedicatedServer.init(DedicatedServer.java:133) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:436) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
Caused by: java.lang.UnsupportedClassVersionError: com/thetruecolonel/plugin/ItemStackRestrictor : Unsupported major.minor version 52.0
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.7.0_03]
at java.lang.ClassLoader.defineClass(ClassLoader.java:791) ~[?:1.7.0_03]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.7.0_03]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) ~[?:1.7.0_03]
at java.net.URLClassLoader.access$100(URLClassLoader.java:71) ~[?:1.7.0_03]
at java.net.URLClassLoader$1.run(URLClassLoader.java:361) ~[?:1.7.0_03]
at java.net.URLClassLoader$1.run(URLClassLoader.java:355) ~[?:1.7.0_03]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.7.0_03]
at java.net.URLClassLoader.findClass(URLClassLoader.java:354) ~[?:1.7.0_03]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:77) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:62) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at java.lang.ClassLoader.loadClass(ClassLoader.java:423) ~[?:1.7.0_03]
at java.lang.ClassLoader.loadClass(ClassLoader.java:356) ~[?:1.7.0_03]
at java.lang.Class.forName0(Native Method) ~[?:1.7.0_03]
at java.lang.Class.forName(Class.java:264) ~[?:1.7.0_03]
at org.bukkit.plugin.java.PluginClassLoader.(PluginClassLoader.java:40) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
at org.bukkit.plugin.java.JavaPluginLoader.loadPlugin(JavaPluginLoader.java:127) ~[craftbukkit.jar:git-Bukkit-1.7.9-R0.2-24-g07d4558-b3116jnks]
... 9 more

My feeling is that it has something to do, if not everything to do, with the "Private ItemStack", but I don't know how to fix it. If you guys/gals could help me, that'd be great!

Thank you in advance to everyone that helps!

 

This is probably why

Code:java

Caused by: java.lang.UnsupportedClassVersionError: com/thetruecolonel/plugin/ItemStackRestrictor : Unsupported major.minor version 52.0

 

The_FrosTy_Clan Any idea on how to fix this?

 

benetha619 http://forums.bukkit.org/threads/unsupportedclassversionerror.44223/

 

The_FrosTy_Clan Alright, got it. Thanks, Mate!

 

benetha619 No problem.