Fixed NPE in BlockFurnace.

src/main/java/net/minecraft/server/BlockFurnace.java

@@ -0,0 +1,145 @@
+package net.minecraft.server;
+
+import java.util.Random;
+
+public class BlockFurnace extends BlockContainer {
+
+    private Random a = new Random();
+    private final boolean b;
+    private static boolean c = false;
+
+    protected BlockFurnace(int i, boolean flag) {
+        super(i, Material.STONE);
+        this.b = flag;
+        this.textureId = 45;
+    }
+
+    public int a(int i, Random random) {
+        return Block.FURNACE.id;
+    }
+
+    public void c(World world, int i, int j, int k) {
+        super.c(world, i, j, k);
+        this.g(world, i, j, k);
+    }
+
+    private void g(World world, int i, int j, int k) {
+        if (!world.isStatic) {
+            int l = world.getTypeId(i, j, k - 1);
+            int i1 = world.getTypeId(i, j, k + 1);
+            int j1 = world.getTypeId(i - 1, j, k);
+            int k1 = world.getTypeId(i + 1, j, k);
+            byte b0 = 3;
+
+            if (Block.o[l] && !Block.o[i1]) {
+                b0 = 3;
+            }
+
+            if (Block.o[i1] && !Block.o[l]) {
+                b0 = 2;
+            }
+
+            if (Block.o[j1] && !Block.o[k1]) {
+                b0 = 5;
+            }
+
+            if (Block.o[k1] && !Block.o[j1]) {
+                b0 = 4;
+            }
+
+            world.setData(i, j, k, b0);
+        }
+    }
+
+    public int a(int i) {
+        return i == 1 ? this.textureId + 17 : (i == 0 ? this.textureId + 17 : (i == 3 ? this.textureId - 1 : this.textureId));
+    }
+
+    public boolean interact(World world, int i, int j, int k, EntityHuman entityhuman) {
+        if (world.isStatic) {
+            return true;
+        } else {
+            TileEntityFurnace tileentityfurnace = (TileEntityFurnace) world.getTileEntity(i, j, k);
+
+            entityhuman.a(tileentityfurnace);
+            return true;
+        }
+    }
+
+    public static void a(boolean flag, World world, int i, int j, int k) {
+        int l = world.getData(i, j, k);
+        TileEntity tileentity = world.getTileEntity(i, j, k);
+        if (tileentity == null) return; // CraftBukkit
+
+        c = true;
+        if (flag) {
+            world.setTypeId(i, j, k, Block.BURNING_FURNACE.id);
+        } else {
+            world.setTypeId(i, j, k, Block.FURNACE.id);
+        }
+
+        c = false;
+        world.setData(i, j, k, l);
+        tileentity.j();
+        world.setTileEntity(i, j, k, tileentity);
+    }
+
+    protected TileEntity a_() {
+        return new TileEntityFurnace();
+    }
+
+    public void postPlace(World world, int i, int j, int k, EntityLiving entityliving) {
+        int l = MathHelper.floor((double) (entityliving.yaw * 4.0F / 360.0F) + 0.5D) & 3;
+
+        if (l == 0) {
+            world.setData(i, j, k, 2);
+        }
+
+        if (l == 1) {
+            world.setData(i, j, k, 5);
+        }
+
+        if (l == 2) {
+            world.setData(i, j, k, 3);
+        }
+
+        if (l == 3) {
+            world.setData(i, j, k, 4);
+        }
+    }
+
+    public void remove(World world, int i, int j, int k) {
+        if (!c) {
+            TileEntityFurnace tileentityfurnace = (TileEntityFurnace) world.getTileEntity(i, j, k);
+
+            for (int l = 0; l < tileentityfurnace.getSize(); ++l) {
+                ItemStack itemstack = tileentityfurnace.getItem(l);
+
+                if (itemstack != null) {
+                    float f = this.a.nextFloat() * 0.8F + 0.1F;
+                    float f1 = this.a.nextFloat() * 0.8F + 0.1F;
+                    float f2 = this.a.nextFloat() * 0.8F + 0.1F;
+
+                    while (itemstack.count > 0) {
+                        int i1 = this.a.nextInt(21) + 10;
+
+                        if (i1 > itemstack.count) {
+                            i1 = itemstack.count;
+                        }
+
+                        itemstack.count -= i1;
+                        EntityItem entityitem = new EntityItem(world, (double) ((float) i + f), (double) ((float) j + f1), (double) ((float) k + f2), new ItemStack(itemstack.id, i1, itemstack.getData()));
+                        float f3 = 0.05F;
+
+                        entityitem.motX = (double) ((float) this.a.nextGaussian() * f3);
+                        entityitem.motY = (double) ((float) this.a.nextGaussian() * f3 + 0.2F);
+                        entityitem.motZ = (double) ((float) this.a.nextGaussian() * f3);
+                        world.addEntity(entityitem);
+                    }
+                }
+            }
+        }
+
+        super.remove(world, i, j, k);
+    }
+}