Spigot Fix (https://github.com/PaperSpigot/Paper-1.7/blob/master/CraftBukkit-Patches/0040-Plug-World-Unload-Memory-Leak.patch)

patches/net/minecraft/block/BlockRedstoneTorch.java.patch

@@ -1,6 +1,15 @@
 --- ../src-base/minecraft/net/minecraft/block/BlockRedstoneTorch.java
 +++ ../src-work/minecraft/net/minecraft/block/BlockRedstoneTorch.java
-@@ -13,6 +13,10 @@
+@@ -3,7 +3,7 @@
+ import cpw.mods.fml.relauncher.Side;
+ import cpw.mods.fml.relauncher.SideOnly;
+ import java.util.ArrayList;
+-import java.util.HashMap;
++import java.util.WeakHashMap;
+ import java.util.List;
+ import java.util.Map;
+ import java.util.Random;
+@@ -13,10 +13,14 @@
  import net.minecraft.world.IBlockAccess;
  import net.minecraft.world.World;
  
@@ -11,6 +20,11 @@
  public class BlockRedstoneTorch extends BlockTorch
  {
      private boolean field_150113_a;
+-    private static Map field_150112_b = new HashMap();
++    private static Map field_150112_b = new WeakHashMap();
+     private static final String __OBFID = "CL_00000298";
+ 
+     private boolean func_150111_a(World p_150111_1_, int p_150111_2_, int p_150111_3_, int p_150111_4_, boolean p_150111_5_)
 @@ -115,8 +119,12 @@
          return l == 5 && p_150110_1_.getIndirectPowerOutput(p_150110_2_, p_150110_3_ - 1, p_150110_4_, 0) ? true : (l == 3 && p_150110_1_.getIndirectPowerOutput(p_150110_2_, p_150110_3_, p_150110_4_ - 1, 2) ? true : (l == 4 && p_150110_1_.getIndirectPowerOutput(p_150110_2_, p_150110_3_, p_150110_4_ + 1, 3) ? true : (l == 1 && p_150110_1_.getIndirectPowerOutput(p_150110_2_ - 1, p_150110_3_, p_150110_4_, 4) ? true : l == 2 && p_150110_1_.getIndirectPowerOutput(p_150110_2_ + 1, p_150110_3_, p_150110_4_, 5))));
      }