Throw meaningful warnings when wrong Essentials version is used with unsupported mod packs.

Author: khobbits

Essentials/src/com/earth2me/essentials/Essentials.java

@@ -158,10 +158,7 @@ public void onEnable()
 				final int versionNumber = Integer.parseInt(versionMatch.group(1));
 				if (versionNumber < BUKKIT_VERSION && versionNumber > 100)
 				{
-					LOGGER.log(Level.SEVERE, " * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! *");
-					LOGGER.log(Level.SEVERE, _("notRecommendedBukkit"));
-					LOGGER.log(Level.SEVERE, _("requiredBukkit", Integer.toString(BUKKIT_VERSION)));
-					LOGGER.log(Level.SEVERE, " * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! *");
+					wrongVersion();
 					this.setEnabled(false);
 					return;
 				}
@@ -570,6 +567,14 @@ public void showError(final CommandSource sender, final Throwable exception, fin
 		}
 	}
 
+	static public void wrongVersion()
+	{
+		LOGGER.log(Level.SEVERE, " * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! *");
+		LOGGER.log(Level.SEVERE, _("notRecommendedBukkit"));
+		LOGGER.log(Level.SEVERE, _("requiredBukkit", Integer.toString(BUKKIT_VERSION)));
+		LOGGER.log(Level.SEVERE, " * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! * ! *");
+	}
+
 	@Override
 	public BukkitScheduler getScheduler()
 	{

Essentials/src/com/earth2me/essentials/Potions.java

@@ -100,14 +100,22 @@ public class Potions
 		POTIONS.put("wither", PotionEffectType.WITHER);
 		ALIASPOTIONS.put("decay", PotionEffectType.WITHER);
 
-		POTIONS.put("healthboost", PotionEffectType.HEALTH_BOOST);
-		ALIASPOTIONS.put("boost", PotionEffectType.HEALTH_BOOST);
 
-		POTIONS.put("absorption", PotionEffectType.ABSORPTION);
-		ALIASPOTIONS.put("absorb", PotionEffectType.ABSORPTION);
+		try // 1.6 update
+		{
+			POTIONS.put("healthboost", PotionEffectType.HEALTH_BOOST);
+			ALIASPOTIONS.put("boost", PotionEffectType.HEALTH_BOOST);
+
+			POTIONS.put("absorption", PotionEffectType.ABSORPTION);
+			ALIASPOTIONS.put("absorb", PotionEffectType.ABSORPTION);
 
-		POTIONS.put("saturation", PotionEffectType.SATURATION);
-		ALIASPOTIONS.put("food", PotionEffectType.SATURATION);
+			POTIONS.put("saturation", PotionEffectType.SATURATION);
+			ALIASPOTIONS.put("food", PotionEffectType.SATURATION);
+		}
+		catch (java.lang.NoSuchFieldError e)
+		{
+			Essentials.wrongVersion();
+		}
 	}
 
 	public static PotionEffectType getByName(String name)

Essentials/src/com/earth2me/essentials/utils/LocationUtil.java

@@ -1,5 +1,6 @@
 package com.earth2me.essentials.utils;
 
+import com.earth2me.essentials.Essentials;
 import static com.earth2me.essentials.I18n._;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -60,7 +61,15 @@ public class LocationUtil
 		HOLLOW_MATERIALS.add(Material.FENCE_GATE.getId());
 		HOLLOW_MATERIALS.add(Material.WATER_LILY.getId());
 		HOLLOW_MATERIALS.add(Material.NETHER_WARTS.getId());
-		HOLLOW_MATERIALS.add(Material.CARPET.getId());
+
+		try // 1.6 update
+		{
+			HOLLOW_MATERIALS.add(Material.CARPET.getId());
+		}
+		catch (java.lang.NoSuchFieldError e)
+		{
+			Essentials.wrongVersion();
+		}
 
 		for (Integer integer : HOLLOW_MATERIALS)
 		{
@@ -160,6 +169,7 @@ public static class Vector3D
 		public int x;
 		public int y;
 		public int z;
+
 		public Vector3D(int x, int y, int z)
 		{
 			this.x = x;