Fixed a NoSuchMethodError on versions pre 1.13

src/main/java/com/songoda/skyblock/listeners/Grow.java

@@ -36,14 +36,15 @@ public class Grow implements Listener {
     }
 
     /**
-	 * Checks that a structure like a tree is not growing outside or into another island.
+     * Checks that a structure like a tree is not growing outside or into another
+     * island.
+     * 
      * @author LimeGlass
      */
     @EventHandler(ignoreCancelled = true)
     public void onStructureGrow(StructureGrowEvent event) {
         WorldManager worldManager = skyblock.getWorldManager();
-		if (!worldManager.isIslandWorld(event.getWorld()))
+        if (!worldManager.isIslandWorld(event.getWorld())) return;
-			return;
 
         IslandManager islandManager = skyblock.getIslandManager();
         Island origin = islandManager.getIslandAtLocation(event.getLocation());
@@ -51,8 +52,7 @@ public class Grow implements Listener {
             BlockState state = it.next();
             Island growingTo = islandManager.getIslandAtLocation(state.getLocation());
             // This block is ok to continue as it's not related to Skyblock islands.
-			if (origin == null && growingTo == null)
+            if (origin == null && growingTo == null) continue;
-				continue;
             // A block from the structure is outside/inside that it's not suppose to.
             if (origin == null || growingTo == null) {
                 it.remove();
@@ -70,13 +70,11 @@ public class Grow implements Listener {
     public void onCropUpgrade(BlockGrowEvent event) {
         org.bukkit.block.Block block = event.getBlock();
         WorldManager worldManager = skyblock.getWorldManager();
-		if (!skyblock.getWorldManager().isIslandWorld(block.getWorld()))
+        if (!skyblock.getWorldManager().isIslandWorld(block.getWorld())) return;
-			return;
 
         IslandManager islandManager = skyblock.getIslandManager();
         Island island = islandManager.getIslandAtLocation(block.getLocation());
-		if (island == null)
+        if (island == null) return;
-			return;
 
         // Check spawn block protection
         IslandWorld world = worldManager.getIslandWorld(block.getWorld());
@@ -88,8 +86,7 @@ public class Grow implements Listener {
         }
 
         List<Upgrade> upgrades = skyblock.getUpgradeManager().getUpgrades(Upgrade.Type.Crop);
-		if (upgrades == null || upgrades.size() == 0 || !upgrades.get(0).isEnabled() || !island.isUpgrade(Upgrade.Type.Crop))
+        if (upgrades == null || upgrades.size() == 0 || !upgrades.get(0).isEnabled() || !island.isUpgrade(Upgrade.Type.Crop)) return;
-			return;
 
         if (NMSUtil.getVersionNumber() > 12) {
             try {
@@ -97,26 +94,18 @@ public class Grow implements Listener {
                 if (blockData instanceof org.bukkit.block.data.Ageable) {
                     org.bukkit.block.data.Ageable ageable = (org.bukkit.block.data.Ageable) blockData;
                     ageable.setAge(ageable.getAge() + 1);
-					block.getClass()
+                    block.getClass().getMethod("setBlockData", Class.forName("org.bukkit.block.data.BlockData")).invoke(block, ageable);
-							.getMethod("setBlockData", Class.forName("org.bukkit.block.data.BlockData"))
-							.invoke(block, ageable);
                 }
-			} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
+            } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException | NoSuchMethodException | SecurityException | ClassNotFoundException e) {
-					| NoSuchMethodException | SecurityException | ClassNotFoundException e) {
                 e.printStackTrace();
             }
         } else {
             Material type = block.getType();
-			if (block.getState().getData() instanceof Crops
+            if (block.getState().getData() instanceof Crops || type.name().equals("BEETROOT_BLOCK") || type.name().equals("CARROT") || type.name().equals("POTATO")
-					|| type.name().equals("BEETROOT_BLOCK")
+                    || type.name().equals("WHEAT") || type.name().equals("CROPS")) {
-					|| type.name().equals("CARROT")
-					|| type.name().equals("POTATO")
-					|| type.name().equals("WHEAT")
-					|| type.name().equals("CROPS")) {
                 try {
                     block.getClass().getMethod("setData", byte.class).invoke(block, (byte) (block.getData() + 1));
-				} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException
+                } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException | NoSuchMethodException | SecurityException e) {
-						| NoSuchMethodException | SecurityException e) {
                     e.printStackTrace();
                 }
             }
@@ -124,24 +113,23 @@ public class Grow implements Listener {
     }
 
     /**
-	 * Checks that a block like a pumpkins and melons are not growing outside or into another island.
+     * Checks that a block like a pumpkins and melons are not growing outside or
+     * into another island.
+     * 
      * @author LimeGlass
      */
     @EventHandler(ignoreCancelled = true)
     public void onBlockGrow(BlockGrowEvent event) {
         WorldManager worldManager = skyblock.getWorldManager();
         BlockState state = event.getNewState();
-		if (!worldManager.isIslandWorld(state.getWorld()))
+        if (!worldManager.isIslandWorld(state.getWorld())) return;
-			return;
+        if (state.getType() != Materials.PUMPKIN.parseMaterial() && state.getType() != Materials.MELON.parseMaterial()) return;
-		if (state.getType() != Materials.PUMPKIN.parseMaterial() && state.getType() != Materials.MELON.parseMaterial())
-			return;
 
         IslandManager islandManager = skyblock.getIslandManager();
         Island origin = islandManager.getIslandAtLocation(event.getBlock().getLocation());
         Island growingTo = islandManager.getIslandAtLocation(state.getLocation());
         // This block is ok to continue as it's not related to Skyblock islands.
-		if (origin == null && growingTo == null)
+        if (origin == null && growingTo == null) return;
-			return;
         // The growing block is outside/inside that it's not suppose to.
         if (origin == null || growingTo == null) {
             event.setCancelled(true);
@@ -155,22 +143,20 @@ public class Grow implements Listener {
     }
 
     /**
-	 * Checks that a structure growing like a tree, does not impact spawn location of the island.
+     * Checks that a structure growing like a tree, does not impact spawn location
+     * of the island.
      */
     @EventHandler(ignoreCancelled = true)
     public void onStructureCreate(StructureGrowEvent event) {
-		if (!skyblock.getFileManager().getConfig(new File(skyblock.getDataFolder(), "config.yml")).getFileConfiguration().getBoolean("Island.Spawn.Protection"))
+        if (!skyblock.getFileManager().getConfig(new File(skyblock.getDataFolder(), "config.yml")).getFileConfiguration().getBoolean("Island.Spawn.Protection")) return;
-			return;
 
         List<BlockState> blocks = event.getBlocks();
-		if (blocks.isEmpty())
+        if (blocks.isEmpty()) return;
-			return;
 
         WorldManager worldManager = skyblock.getWorldManager();
         IslandManager islandManager = skyblock.getIslandManager();
         Island island = islandManager.getIslandAtLocation(event.getLocation());
-		if (island == null)
+        if (island == null) return;
-			return;
 
         // Check spawn block protection
         IslandWorld world = worldManager.getIslandWorld(blocks.get(0).getWorld());
@@ -184,27 +170,22 @@ public class Grow implements Listener {
 
     @EventHandler
     public void onFireSpread(BlockSpreadEvent event) {
-		if (event.getSource().getType() != Material.FIRE)
+        if (event.getSource().getType() != Material.FIRE) return;
-			return;
 
         org.bukkit.block.Block block = event.getBlock();
-		if (!skyblock.getWorldManager().isIslandWorld(block.getWorld()))
+        if (!skyblock.getWorldManager().isIslandWorld(block.getWorld())) return;
-			return;
 
         IslandManager islandManager = skyblock.getIslandManager();
-		if (!islandManager.hasSetting(block.getLocation(), IslandRole.Owner, "FireSpread"))
+        if (!islandManager.hasSetting(block.getLocation(), IslandRole.Owner, "FireSpread")) event.setCancelled(true);
-			event.setCancelled(true);
     }
 
     @EventHandler
     public void onLeavesDecay(LeavesDecayEvent event) {
         org.bukkit.block.Block block = event.getBlock();
-		if (!skyblock.getWorldManager().isIslandWorld(block.getWorld()))
+        if (!skyblock.getWorldManager().isIslandWorld(block.getWorld())) return;
-			return;
 
         IslandManager islandManager = skyblock.getIslandManager();
-		if (!islandManager.hasSetting(block.getLocation(), IslandRole.Owner, "LeafDecay"))
+        if (!islandManager.hasSetting(block.getLocation(), IslandRole.Owner, "LeafDecay")) event.setCancelled(true);
-			event.setCancelled(true);
     }
 
 }

src/main/java/com/songoda/skyblock/scoreboard/ScoreboardManager.java

@@ -161,7 +161,7 @@ public class ScoreboardManager extends BukkitRunnable {
 
                 obj.setDisplayName(primaryObjective.getDisplayName());
                 obj.setDisplaySlot(primaryObjective.getDisplaySlot());
-                obj.setRenderType(primaryObjective.getRenderType());
+                if (VERSION > 12) obj.setRenderType(primaryObjective.getRenderType());
             }
 
             for (Team primaryTeam : teams) {