Make fields final if possible to ensure immutability

src/main/java/appeng/me/storage/CellInventory.java

@@ -335,7 +335,7 @@ public class CellInventory implements ICellInventory
 		return 8 - div;
 	}
 
-	private static HashSet<Integer> blackList = new HashSet<Integer>();
+	private static final HashSet<Integer> blackList = new HashSet<Integer>();
 
 	public static void addBasicBlackList(int itemID, int Meta)
 	{

src/main/java/appeng/me/storage/CreativeCellInventory.java

@@ -16,7 +16,7 @@ import appeng.util.item.AEItemStack;
 public class CreativeCellInventory implements IMEInventoryHandler<IAEItemStack>
 {
 
-	IItemList<IAEItemStack> itemListCache = AEApi.instance().storage().createItemList();
+	final IItemList<IAEItemStack> itemListCache = AEApi.instance().storage().createItemList();
 
 	public static IMEInventoryHandler getCell(ItemStack o)
 	{

src/main/java/appeng/me/storage/DriveWatcher.java

@@ -11,7 +11,7 @@ import appeng.api.storage.data.IAEStack;
 public class DriveWatcher<T extends IAEStack<T>> extends MEInventoryHandler<T>
 {
 
-	int oldStatus = 0;
+	final int oldStatus = 0;
 	final ItemStack is;
 	final ICellHandler handler;
 	final IChestOrDrive cord;

src/main/java/appeng/me/storage/ItemWatcher.java

@@ -48,9 +48,9 @@ public class ItemWatcher implements IStackWatcher
 
 	}
 
-	GridStorageCache gsc;
-	IStackWatcherHost myObject;
-	HashSet<IAEStack> myInterests = new HashSet<IAEStack>();
+	final GridStorageCache gsc;
+	final IStackWatcherHost myObject;
+	final HashSet<IAEStack> myInterests = new HashSet<IAEStack>();
 
 	public ItemWatcher(GridStorageCache cache, IStackWatcherHost host) {
 		gsc = cache;

src/main/java/appeng/me/storage/MEIInventoryWrapper.java

@@ -15,8 +15,8 @@ import appeng.util.item.AEItemStack;
 public class MEIInventoryWrapper implements IMEInventory<IAEItemStack>
 {
 
-	protected IInventory target;
-	protected InventoryAdaptor adaptor;
+	protected final IInventory target;
+	protected final InventoryAdaptor adaptor;
 
 	public MEIInventoryWrapper(IInventory m, InventoryAdaptor ia) {
 		target = m;

src/main/java/appeng/me/storage/MEMonitorPassThrough.java

@@ -18,7 +18,7 @@ import appeng.util.inv.ItemListIgnoreCrafting;
 public class MEMonitorPassThrough<T extends IAEStack<T>> extends MEPassThrough<T> implements IMEMonitor<T>, IMEMonitorHandlerReceiver<T>
 {
 
-	HashMap<IMEMonitorHandlerReceiver<T>, Object> listeners = new HashMap<IMEMonitorHandlerReceiver<T>, Object>();
+	final HashMap<IMEMonitorHandlerReceiver<T>, Object> listeners = new HashMap<IMEMonitorHandlerReceiver<T>, Object>();
 	IMEMonitor<T> monitor;
 
 	public BaseActionSource changeSource;

src/main/java/appeng/me/storage/VoidFluidInventory.java

@@ -12,7 +12,7 @@ import appeng.tile.misc.TileCondenser;
 public class VoidFluidInventory implements IMEInventoryHandler<IAEFluidStack>
 {
 
-	TileCondenser target;
+	final TileCondenser target;
 
 	public VoidFluidInventory(TileCondenser te) {
 		target = te;

src/main/java/appeng/me/storage/VoidItemInventory.java

@@ -12,7 +12,7 @@ import appeng.tile.misc.TileCondenser;
 public class VoidItemInventory implements IMEInventoryHandler<IAEItemStack>
 {
 
-	TileCondenser target;
+	final TileCondenser target;
 
 	public VoidItemInventory(TileCondenser te) {
 		target = te;