fix: update to changes in 1.21 class paths

Bukkit/src/main/java/com/plotsquared/bukkit/BukkitPlatform.java

@@ -1171,7 +1171,9 @@ public final class BukkitPlatform extends JavaPlugin implements Listener, PlotPl
     @Override
     public @NonNull String serverNativePackage() {
         final String name = Bukkit.getServer().getClass().getPackage().getName();
-        return name.substring(name.lastIndexOf('.') + 1);
+        String ver = name.substring(name.lastIndexOf('.') + 1);
+        // org.bukkit.craftbukkit is no longer suffixed by a version
+        return ver.equals("craftbukkit") ? "" : ver;
     }
 
     @Override

Bukkit/src/main/java/com/plotsquared/bukkit/listener/SingleWorldListener.java

@@ -49,9 +49,14 @@ public class SingleWorldListener implements Listener {
             this.methodGetHandleChunk = classCraftChunk.getMethod("getHandle").getRealMethod();
         } catch (NoSuchMethodException ignored) {
             try {
-                ReflectionUtils.RefClass classChunkStatus = getRefClass("net.minecraft.world.level.chunk.ChunkStatus");
+                String chunkStatus = PlotSquared.platform().serverVersion()[1] < 21
+                        ? "net.minecraft.world.level.chunk" + ".ChunkStatus"
+                        : "net.minecraft.world.level.chunk.status.ChunkStatus";
+                ReflectionUtils.RefClass classChunkStatus = getRefClass(chunkStatus);
                 this.objChunkStatusFull = classChunkStatus.getRealClass().getField("n").get(null);
-                this.methodGetHandleChunk = classCraftChunk.getMethod("getHandle", classChunkStatus.getRealClass()).getRealMethod();
+                this.methodGetHandleChunk = classCraftChunk
+                        .getMethod("getHandle", classChunkStatus.getRealClass())
+                        .getRealMethod();
             } catch (NoSuchMethodException ex) {
                 throw new RuntimeException(ex);
             }

Core/src/main/java/com/plotsquared/core/PlotSquared.java

@@ -206,7 +206,8 @@ public class PlotSquared {
         GlobalFlagContainer.setup();
 
         try {
-            new ReflectionUtils(this.platform.serverNativePackage());
+            String ver = this.platform.serverNativePackage();
+            new ReflectionUtils(ver.isEmpty() ? null : ver);
             try {
                 URL logurl = PlotSquared.class.getProtectionDomain().getCodeSource().getLocation();
                 this.jarFile = new File(
@@ -214,7 +215,7 @@ public class PlotSquared {
                                 logurl.toURI().toString().split("\\!")[0].replaceAll("jar:file", "file"))
                                 .getPath());
             } catch (URISyntaxException | SecurityException e) {
-                e.printStackTrace();
+                LOGGER.error(e);
                 this.jarFile = new File(this.platform.getDirectory().getParentFile(), "PlotSquared.jar");
                 if (!this.jarFile.exists()) {
                     this.jarFile = new File(
@@ -238,7 +239,7 @@ public class PlotSquared {
             copyFile("skyblock.template", Settings.Paths.TEMPLATES);
             showDebug();
         } catch (Throwable e) {
-            e.printStackTrace();
+            LOGGER.error(e);
         }
     }