Make fields final if possible to ensure immutability

src/main/java/appeng/parts/p2p/PartP2PItems.java

@@ -57,7 +57,7 @@ public class PartP2PItems extends PartP2PTunnel<PartP2PItems> implements IPipeCo
 	boolean requested;
 	IInventory cachedInv;
 
-	LinkedList<IInventory> which = new LinkedList<IInventory>();
+	final LinkedList<IInventory> which = new LinkedList<IInventory>();
 
 	IInventory getOutputInv()
 	{

src/main/java/appeng/parts/p2p/PartP2PTunnel.java

@@ -37,7 +37,7 @@ public class PartP2PTunnel<T extends PartP2PTunnel> extends PartBasicState
 
 	public boolean output;
 	public long freq;
-	TunnelCollection type = new TunnelCollection<T>( null, getClass() );
+	final TunnelCollection type = new TunnelCollection<T>( null, getClass() );
 
 	public PartP2PTunnel(ItemStack is) {
 		super( PartP2PTunnel.class, is );

src/main/java/appeng/parts/p2p/PartP2PTunnelME.java

@@ -36,8 +36,8 @@ public class PartP2PTunnelME extends PartP2PTunnel<PartP2PTunnelME> implements I
 		return TunnelType.ME;
 	}
 
-	AENetworkProxy outerProxy = new AENetworkProxy( this, "outer", null, true );
-	public Connections connection = new Connections( this );
+	final AENetworkProxy outerProxy = new AENetworkProxy( this, "outer", null, true );
+	public final Connections connection = new Connections( this );
 
 	public PartP2PTunnelME(ItemStack is) {
 		super( is );