some Testing with Blockdisplays

.idea/modules.xml

@@ -3,6 +3,7 @@
   <component name="ProjectModuleManager">
     <modules>
       <module fileurl="file://$PROJECT_DIR$/.idea/modules/PixelBlocks.main.iml" filepath="$PROJECT_DIR$/.idea/modules/PixelBlocks.main.iml" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/modules/eu.mhsl.minecraft.PixelBlocks.main.iml" filepath="$PROJECT_DIR$/.idea/modules/eu.mhsl.minecraft.PixelBlocks.main.iml" />
     </modules>
   </component>
 </project>

.idea/modules/PixelBlocks.main.iml

@@ -11,4 +11,8 @@
       </configuration>
     </facet>
   </component>
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
 </module>

.idea/modules/eu.mhsl.minecraft.PixelBlocks.main.iml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module version="4">
+  <component name="FacetManager">
+    <facet type="minecraft" name="Minecraft">
+      <configuration>
+        <autoDetectTypes>
+          <platformType>PAPER</platformType>
+          <platformType>ADVENTURE</platformType>
+        </autoDetectTypes>
+        <projectReimportVersion>1</projectReimportVersion>
+      </configuration>
+    </facet>
+  </component>
+</module>

src/main/java/commands/ChessCommand.java

@@ -0,0 +1,47 @@
+package commands;
+
+import org.bukkit.Location;
+import org.bukkit.Material;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.BlockDisplay;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+public class ChessCommand implements CommandExecutor {
+    @Override
+    public boolean onCommand(@NotNull CommandSender sender, @NotNull Command command, @NotNull String label, @NotNull String[] args) {
+        if(sender instanceof Player p) {
+            Location playerLocation = p.getLocation();
+
+            for (int i = 0; i < 8; i++) {
+                int finalI = i+1;
+                for (int j = 0; j < 8; j++) {
+                    int finalJ = j+1;
+                    p.getWorld().spawn(
+                        new Location(p.getWorld(),
+                                playerLocation.x()+i,
+                                playerLocation.y(),
+                                playerLocation.z()+j),
+                        BlockDisplay.class, blockDisplay -> {
+                            if(finalI % 2 == 0 && finalJ % 2 == 0) {
+                                blockDisplay.setBlock(Material.BLACK_CONCRETE.createBlockData());
+                            } else if(finalI % 2 != 0 && finalJ % 2 != 0) {
+                                blockDisplay.setBlock(Material.BLACK_CONCRETE.createBlockData());
+                            } else {
+                                blockDisplay.setBlock(Material.WHITE_CONCRETE.createBlockData());
+                            }
+                            blockDisplay.setDisplayHeight(0.5f);
+                            blockDisplay.setDisplayWidth(0.5f);
+                        }
+                    );
+                }
+            }
+
+        } else {
+            return(true);
+        }
+        return true;
+    }
+}

src/main/java/eu/mhsl/minecraft/pixelblocks/PixelBlocks.java

@@ -1,7 +1,11 @@
 package eu.mhsl.minecraft.pixelblocks;
 
+import commands.ChessCommand;
+import listeners.PlayerJumpListener;
 import org.bukkit.plugin.java.JavaPlugin;
 
+import java.util.Objects;
+
 public final class PixelBlocks extends JavaPlugin {
     public static PixelBlocks plugin;
 
@@ -9,6 +13,8 @@ public final class PixelBlocks extends JavaPlugin {
     public void onEnable() {
         PixelBlocks.plugin = this;
         this.getLogger().info("Hello World");
+        getServer().getPluginManager().registerEvents(new PlayerJumpListener(), this);
+        Objects.requireNonNull(getCommand("chess")).setExecutor(new ChessCommand());
     }
 
     @Override

src/main/java/listeners/PlayerJoinListener.java

@@ -0,0 +1,12 @@
+package listeners;
+
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerJoinEvent;
+
+public class PlayerJoinListener implements Listener {
+    @EventHandler
+    static void onPlayerJoin(PlayerJoinEvent event) {
+
+    }
+}

src/main/java/listeners/PlayerJumpListener.java

@@ -0,0 +1,17 @@
+package listeners;
+
+import com.destroystokyo.paper.event.player.PlayerJumpEvent;
+import org.bukkit.Material;
+import org.bukkit.entity.BlockDisplay;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+
+public class PlayerJumpListener implements Listener {
+    @EventHandler
+    static void onPlayerJump(PlayerJumpEvent event) {
+        event.getPlayer().getWorld().spawn(event.getPlayer().getLocation(), BlockDisplay.class, blockDisplay -> {
+            blockDisplay.setBlock(Material.OAK_LOG.createBlockData());
+        });
+
+    }
+}

src/main/resources/plugin.yml

@@ -2,3 +2,5 @@ name: PixelBlocks
 version: '${version}'
 main: eu.mhsl.minecraft.pixelblocks.PixelBlocks
 api-version: '1.21'
+commands:
+  chess: