java - Command in my bukkitplugin not working -

now have changed 'commands' 'commands' in plugin.yml error in cmd when run server. error says '.jar file not contain plugin.yml'.

this plugin.yml of now:

name: wand version: 1.0 main: me.pixel.main commands:  wand: 

and main file currently:

package me.pixel;  import java.util.arraylist; import java.util.list;  import org.bukkit.chatcolor; import org.bukkit.effect; import org.bukkit.material; import org.bukkit.command.command; import org.bukkit.command.commandsender; import org.bukkit.entity.player; 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; import org.bukkit.plugin.java.javaplugin;  public class main extends javaplugin implements listener {     public main plugin;     public list<string> spells = new arraylist<string>();     public gettargets gettargets = new gettargets();     public spark spark = new spark(this);     public poisonwave poisonwave = new poisonwave(this);     public darkspark darkspark = new darkspark(this);      @override     public void onenable() {         plugin = this;         getserver().getpluginmanager().registerevents(this, this);         spells.add("spark");         spells.add("poisonwave");         spells.add("darkspark");     }      @override     public boolean oncommand(commandsender sender, command command,             string label, string[] args) {         if(label.equalsignorecase("wand")) {             if(!(sender instanceof player)) {                 sender.sendmessage(chatcolor.red + "you need in-game player perform action!");             } else {                 player p = (player) sender;                 if(sender.haspermission("wand.wand")) {                     itemstack stack = new itemstack(material.blaze_rod);                     itemmeta stackmeta = stack.getitemmeta();                     stackmeta.setdisplayname(chatcolor.red + "empire wand");                     stack.setitemmeta(stackmeta);                     p.getinventory().additem(stack);                     chatutilities.sendmessage(p, "you have got powerful empire wand!");                 } else {                     chatutilities.sendmessage(p, chatcolor.red + "error: no permission!");                 }             }         }         return false;     }      @eventhandler     public void onclick(playerinteractevent e) {         if((e.getaction() == action.right_click_air) || e.getaction() == action.right_click_block) {             player p = e.getplayer();             itemstack stack = p.getiteminhand();             if(stack != null && stack.gettype() == material.blaze_rod && stack.hasitemmeta() && stack.getitemmeta().getdisplayname().equals(chatcolor.red + "empire wand")) {                 int spellselected = stack.getdurability();                 if(spellselected < 2) {                     stack.setdurability((short) (spellselected + 1));                     p.getworld().playeffect(p.getlocation(), effect.step_sound, 119, 30);                 } else {                     stack.setdurability((short) 0);                 }                 chatutilities.sendmessage(p, "selected: " + spells.get(spellselected));             }         }         if(e.getaction() == action.left_click_air || e.getaction() == action.left_click_block) {             player p = e.getplayer();             itemstack stack = p.getiteminhand();             if(stack != null && stack.gettype() == material.blaze_rod && stack.hasitemmeta() && stack.getitemmeta().getdisplayname().equals(chatcolor.red + "empire wand")) {                 int spellselected = stack.getdurability();                 if(spellselected == 1) {                     this.spark.oncast(p);                   } else if (spellselected == 0) {                    this.poisonwave.oncast(p);                 }             }         }     } } 

the plugin.yml file case senstitive, name of list of commands needs lowercase (commands instead of commands). since have capitalized, bukkit/spigot doesn't register commands resulting in "unknown command. type "/help" help." message if test /wand command (i'm assuming error you're getting, didn't describe problem nor expected behavior, happened when tested code, , correcting name of commands list made command execute).