Add code.

src/main/java/com/hyperling/minecraft/coderdojotest/CoderDojoTest.java

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+package com.hyperling.minecraft.coderdojotest;
+
+import org.bukkit.Bukkit;
+import org.bukkit.GameMode;
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+import org.bukkit.event.player.PlayerLoginEvent;
+import org.bukkit.inventory.Inventory;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.PlayerInventory;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public final class CoderDojoTest extends JavaPlugin implements Listener {
+	public CoderDojoTest() {
+		
+	}
+    
+	@Override
+	public void onEnable() {
+		getLogger().info("onEnable has been accessed.");
+		getServer().getPluginManager().registerEvents(this, this);
+	}
+	
+	@Override
+	public void onDisable() {
+		getLogger().info("onDisable has been accessed.");
+	}
+	
+	@EventHandler
+	public void onJoin(PlayerJoinEvent event) {
+		getLogger().info("Running onJoin.");
+		Player player = event.getPlayer();
+		
+		getServer().broadcastMessage("Welcome to the server, " + player.getDisplayName() + "!");
+
+		final PlayerInventory inv = player.getInventory();
+
+		// Give diamond tools and food if not in creative
+		if (getServer().getDefaultGameMode() != GameMode.CREATIVE) {
+			getServer().broadcastMessage("Enjoy your items!");
+			ItemStack item;
+			item = new ItemStack(Material.DIAMOND_SWORD);
+			inv.remove(Material.DIAMOND_SWORD);
+			inv.addItem(item);
+			item = new ItemStack(Material.DIAMOND_AXE);
+			inv.remove(Material.DIAMOND_AXE);
+			inv.addItem(item);
+			item = new ItemStack(Material.DIAMOND_PICKAXE);
+			inv.remove(Material.DIAMOND_PICKAXE);
+			inv.addItem(item);
+			item = new ItemStack(Material.DIAMOND_SPADE);
+			inv.remove(Material.DIAMOND_SPADE);
+			inv.addItem(item);
+			item = new ItemStack(Material.DIAMOND_HOE);
+			inv.remove(Material.DIAMOND_HOE);
+			inv.addItem(item);
+			
+			// Give food
+			item = new ItemStack(Material.GOLDEN_APPLE);
+			inv.remove(Material.GOLDEN_APPLE);
+			item.setAmount(64);
+			inv.addItem(item);
+			
+			// These work
+			item = new ItemStack(Material.DIAMOND_BOOTS);
+			inv.setBoots(item);		
+			item = new ItemStack(Material.DIAMOND_LEGGINGS);
+			inv.setLeggings(item);		
+			item = new ItemStack(Material.DIAMOND_CHESTPLATE);
+			inv.setChestplate(item);		
+			item = new ItemStack(Material.DIAMOND_HELMET);
+			inv.setHelmet(item);
+		}
+		else {
+			inv.clear();
+			getServer().broadcastMessage("Inventory has been cleared for Creative mode.");
+		}
+
+		getLogger().info("Refreshed diamond items.");
+	}
+}

src/main/resources/plugin.yml

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+name: CoderDojoTest
+main: com.hyperling.minecraft.coderdojotest.CoderDojoTest
+version: 0.1.2