Please tell me what i'm doing wrong

I am trying to make a basic plugin for my server, I am new to java, and plugins. Even when I type /plugins, it doesn't show up. This is it, thank you!
-----------------------------------------------------------------------------------------------------------------------

package me.nanerz_123;

import org.bukkit.Bukkit;

import org.bukkit.Location;

import org.bukkit.command.Command;

import org.bukkit.command.CommandSender;

import org.bukkit.entity.HumanEntity;

import org.bukkit.entity.Player;

import org.bukkit.event.Listener;

import org.bukkit.inventory.PlayerInventory;

/* This gives the player a whole list of info! */


publicclass MyFirstPlugin implements Listener {


publicvoid onEnable() {






}





publicvoid onDisable() {




}



publicboolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {

// Uses equalsIgnoreCase() over equals() to accept "pinfo" or "pInFo"

if (cmd.getName().equalsIgnoreCase("pinfo")) {

// Make sure that the player specified exactly one argument (the name of the player to pinfo).

if (args.length != 1) {

// When onCommand() returns false, the help message associated with that command is displayed.

returnfalse;


}



// Make sure the sender is a player.

if (!(sender instanceof Player)) {

sender.sendMessage("Only players can see other players info ingame");

returntrue;


}



// Get the player who you should get the info about. Remember that indecies start with 0, not 1.


Player target = Bukkit.getServer().getPlayer(args[0]);



// Make sure the player is online.

if (target == null) {

sender.sendMessage(args[0] + " is not currently online.");

returntrue;


}



// The thing that you make happen, in this case send the sender the player's info. Use target for the argument for example target.setFireTicks(1000);


Location playerspawnloc = ((Player) sender).getBedSpawnLocation();



Location playersloc = ((Player) sender).getLocation();



PlayerInventory playersinvent = ((HumanEntity) sender).getInventory();





sender.sendMessage("Your spawn X Coordinates : " + playerspawnloc.getX());


sender.sendMessage("Your spawn Y Coordinates : " + playerspawnloc.getY());


sender.sendMessage("Your spawn Z Coordinates : " + playerspawnloc.getZ());


sender.sendMessage("Your x cord is : " + playersloc.getX());


sender.sendMessage("Your y cord is : " + playersloc.getY());


sender.sendMessage("Your z cord is : " + playersloc.getZ());


sender.sendMessage("Your world is : " + playersloc.getWorld());


sender.sendMessage("Your direction is : " + playersloc.getDirection());


sender.sendMessage("The chunk you are in is : " + playersloc.getChunk());


sender.sendMessage("Your Pitch is : " + playersloc.getPitch());


sender.sendMessage("You have this helment : " + playersinvent.getHelmet());


sender.sendMessage("You have this chestplate : " + playersinvent.getChestplate());


sender.sendMessage("You have these leggings : " + playersinvent.getLeggings());


sender.sendMessage("You have these boots : " + playersinvent.getBoots());

returntrue;


}

returnfalse;


}



}

 

nanerz_123 You are implementing Listener when you should be extending JavaPlugin.

Code:

package me.nanerz_123;
 
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.HumanEntity;
import org.bukkit.entity.Player;
import org.bukkit.inventory.PlayerInventory;
import org.bukkit.plugin.java.JavaPlugin;
 
/* This gives the player a whole list of info! */
 
public class MyFirstPlugin extends JavaPlugin {
 
public void onEnable() {
 
}
 
public void onDisable() {
 
}
 
public boolean onCommand(CommandSender sender, Command cmd, String label,
String[] args) {
 
// Uses equalsIgnoreCase() over equals() to accept "pinfo" or "pInFo"
 
if (cmd.getName().equalsIgnoreCase("pinfo")) {
 
// Make sure that the player specified exactly one argument (the
// name of the player to pinfo).
 
if (args.length != 1) {
 
// When onCommand() returns false, the help message associated
// with that command is displayed.
 
return false;
 
}
 
// Make sure the sender is a player.
 
if (!(sender instanceof Player)) {
 
sender.sendMessage("Only players can see other players info ingame");
 
return true;
 
}
 
// Get the player who you should get the info about. Remember that
// indecies start with 0, not 1.
 
Player target = Bukkit.getServer().getPlayer(args[0]);
 
// Make sure the player is online.
 
if (target == null) {
 
sender.sendMessage(args[0] + " is not currently online.");
 
return true;
 
}
 
// The thing that you make happen, in this case send the sender the
// player's info. Use target for the argument for example
// target.setFireTicks(1000);
 
Location playerspawnloc = ((Player) sender).getBedSpawnLocation();
 
Location playersloc = ((Player) sender).getLocation();
 
PlayerInventory playersinvent = ((HumanEntity) sender)
.getInventory();
 
sender.sendMessage("Your spawn X Coordinates : "
+ playerspawnloc.getX());
 
sender.sendMessage("Your spawn Y Coordinates : "
+ playerspawnloc.getY());
 
sender.sendMessage("Your spawn Z Coordinates : "
+ playerspawnloc.getZ());
 
sender.sendMessage("Your x cord is : " + playersloc.getX());
 
sender.sendMessage("Your y cord is : " + playersloc.getY());
 
sender.sendMessage("Your z cord is : " + playersloc.getZ());
 
sender.sendMessage("Your world is : " + playersloc.getWorld());
 
sender.sendMessage("Your direction is : "
+ playersloc.getDirection());
 
sender.sendMessage("The chunk you are in is : "
+ playersloc.getChunk());
 
sender.sendMessage("Your Pitch is : " + playersloc.getPitch());
 
sender.sendMessage("You have this helment : "
+ playersinvent.getHelmet());
 
sender.sendMessage("You have this chestplate : "
+ playersinvent.getChestplate());
 
sender.sendMessage("You have these leggings : "
+ playersinvent.getLeggings());
 
sender.sendMessage("You have these boots : "
+ playersinvent.getBoots());
 
return true;
 
}
 
return false;
 
}
 
}

 

thx