Fix a mistake cause Biome generation crash.

src/minecraft/net/minecraft/src/BiomeCache.java

@@ -16,7 +16,7 @@ public class BiomeCache
     /**
      * The map of keys to BiomeCacheBlocks. Keys are based on the chunk x, z coordinates as (x | z << 32).
      */
-    private HashMap cacheMap = new HashMap();
+    private HashMap<ChunkCoordIntPair, BiomeCacheBlock> cacheMap = new HashMap<>();
 
     /** The list of cached BiomeCacheBlocks */
     private List cache = new ArrayList();
@@ -32,7 +32,7 @@ public class BiomeCache
     public BiomeCacheBlock getBiomeCacheBlock(BigInteger par1, BigInteger par2)
     {
     	BiomeCacheBlock var5 = (BiomeCacheBlock) cacheMap.computeIfAbsent(new ChunkCoordIntPair(par1.shiftRight(4), par2.shiftRight(4)), key -> {
-    		BiomeCacheBlock cache = new BiomeCacheBlock(BiomeCache.this, par1, par2);
+    		BiomeCacheBlock cache = new BiomeCacheBlock(BiomeCache.this, key.chunkXPos, key.chunkZPos);
     		this.cache.add(cache);
     		return cache;
     	});

src/minecraft/net/minecraft/src/EntityPlayer.java

@@ -1025,7 +1025,7 @@ public abstract class EntityPlayer extends EntityLiving implements ICommandSende
         this.experienceTotal = par1NBTTagCompound.getInteger("XpTotal");
         if(par1NBTTagCompound.hasKey("PosXBig")) {
         	this.posXBig = par1NBTTagCompound.getBigDecimal("PosXBig");
-            this.posXBig = par1NBTTagCompound.getBigDecimal("PosXBig");
+            this.posZBig = par1NBTTagCompound.getBigDecimal("PosZBig");
             setPosition(posXBig, posY, posZBig);
         }
 

src/minecraft/net/minecraft/src/GenLayerIsland.java

@@ -26,10 +26,10 @@ public class GenLayerIsland extends GenLayer
             }
         }
 //		TODO: What the fuck is this???
-//        if (par1 > -par3 && par1 <= 0 && par2 > -par4 && par2 <= 0)
+        if (par1.compareTo(BigInteger.valueOf(-par3)) > 0 && par1.signum() != 1 /*<= 0*/ && par2.compareTo(BigInteger.valueOf(-par4)) > 0 && par2.signum() != 1 /*<= 0*/)
-//        {
+        {
-//            var5[-par1 + -par2 * par3] = 1;
+            var5[-par1.intValueExact() + -par2.intValueExact() * par3] = 1;
-//        }
+        }
 
         return var5;
     }