Add code.

pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.hyperling.minecraft</groupId>
+  <artifactId>CoderDojoTest</artifactId>
+  <version>0.1.3-SNAPSHOT</version>
+  <name>Coder Dojo Test</name>
+  <description>Test project written to learn how to do Minecraft plug-in for Coder Dojo.</description>
+  
+  <build>
+      <plugins>
+          <plugin>
+              <groupId>org.apache.maven.plugins</groupId>
+              <artifactId>maven-compiler-plugin</artifactId>
+              <configuration>
+                  <source>1.7</source>
+                  <target>1.7</target>
+              </configuration>
+          </plugin>
+      </plugins>
+   </build>
+   
+   <repositories>
+       <repository>
+         <id>spigot-repo</id>
+         <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
+       </repository>
+   </repositories>
+   
+   <dependencies>
+       <dependency>
+           <groupId>org.bukkit</groupId>
+           <artifactId>bukkit</artifactId>
+           <version>1.12.2-R0.1-SNAPSHOT</version><!--change this value depending on the version or use LATEST-->
+           <type>jar</type>
+           <scope>provided</scope>
+       </dependency>
+       
+       <dependency>
+           <groupId>org.spigotmc</groupId>
+           <artifactId>spigot-api</artifactId>
+           <version>1.12.2-R0.1-SNAPSHOT</version><!--change this value depending on the version-->
+           <type>jar</type>
+           <scope>provided</scope>
+       </dependency>
+   </dependencies>    
+   
+</project>

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

target/classes/plugin.yml

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

target/maven-archiver/pom.properties

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+#Generated by Maven
+#Thu Dec 27 10:04:47 CST 2018
+version=0.1.3-SNAPSHOT
+groupId=com.hyperling.minecraft
+artifactId=CoderDojoTest

target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst

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+/home/ling/Programs/eclipse-workspace/CoderDojoTest/src/main/java/com/hyperling/minecraft/coderdojotest/CoderDojoTest.java