diff --git a/transport/src/main/java/io/netty/channel/AbstractChannel.java b/transport/src/main/java/io/netty/channel/AbstractChannel.java
index eeda3cb99b..5876fc3b1a 100644
--- a/transport/src/main/java/io/netty/channel/AbstractChannel.java
+++ b/transport/src/main/java/io/netty/channel/AbstractChannel.java
@@ -791,7 +791,7 @@ public abstract class AbstractChannel extends DefaultAttributeMap implements Cha
         }
     }
 
-    final class CloseFuture extends DefaultChannelPromise {
+    static final class CloseFuture extends DefaultChannelPromise {
 
         CloseFuture(AbstractChannel ch) {
             super(ch);
diff --git a/transport/src/main/java/io/netty/channel/ChannelOutboundBuffer.java b/transport/src/main/java/io/netty/channel/ChannelOutboundBuffer.java
index 8d1bbf6208..568d0068c4 100644
--- a/transport/src/main/java/io/netty/channel/ChannelOutboundBuffer.java
+++ b/transport/src/main/java/io/netty/channel/ChannelOutboundBuffer.java
@@ -245,7 +245,7 @@ public final class ChannelOutboundBuffer {
             return false;
         }
 
-        Entry e = buffer[this.flushed];
+        Entry e = buffer[flushed];
         Object msg = e.msg;
         if (msg == null) {
             return false;
@@ -256,7 +256,7 @@ public final class ChannelOutboundBuffer {
 
         e.clear();
 
-        this.flushed = flushed + 1 & buffer.length - 1;
+        flushed = flushed + 1 & buffer.length - 1;
 
         safeRelease(msg);
 
diff --git a/transport/src/main/java/io/netty/channel/embedded/EmbeddedChannel.java b/transport/src/main/java/io/netty/channel/embedded/EmbeddedChannel.java
index 2da3966bf4..5b01a9c58d 100644
--- a/transport/src/main/java/io/netty/channel/embedded/EmbeddedChannel.java
+++ b/transport/src/main/java/io/netty/channel/embedded/EmbeddedChannel.java
@@ -197,7 +197,8 @@ public class EmbeddedChannel extends AbstractChannel {
 
             flush();
 
-            for (int i = 0; i < futures.size(); i++) {
+            int size = futures.size();
+            for (int i = 0; i < size; i++) {
                 ChannelFuture future = (ChannelFuture) futures.get(i);
                 assert future.isDone();
                 if (future.cause() != null) {
diff --git a/transport/src/main/java/io/netty/channel/local/LocalChannel.java b/transport/src/main/java/io/netty/channel/local/LocalChannel.java
index 6b067d476c..a52937ad38 100644
--- a/transport/src/main/java/io/netty/channel/local/LocalChannel.java
+++ b/transport/src/main/java/io/netty/channel/local/LocalChannel.java
@@ -293,8 +293,8 @@ public class LocalChannel extends AbstractChannel {
             peerLoop.execute(new Runnable() {
                 @Override
                 public void run() {
-                    for (Object o: msgsCopy) {
-                        peer.inboundBuffer.add(o);
+                    for (int i = 0;  i < msgsCopy.length; i++) {
+                        peer.inboundBuffer.add(msgsCopy[i]);
                     }
                     finishPeerRead(peer, peerPipeline);
                 }
diff --git a/transport/src/main/java/io/netty/channel/nio/AbstractNioMessageChannel.java b/transport/src/main/java/io/netty/channel/nio/AbstractNioMessageChannel.java
index 6c0e1c8333..70c6d97cea 100644
--- a/transport/src/main/java/io/netty/channel/nio/AbstractNioMessageChannel.java
+++ b/transport/src/main/java/io/netty/channel/nio/AbstractNioMessageChannel.java
@@ -85,7 +85,8 @@ public abstract class AbstractNioMessageChannel extends AbstractNioChannel {
                 exception = t;
             }
 
-            for (int i = 0; i < readBuf.size(); i ++) {
+            int size = readBuf.size();
+            for (int i = 0; i < size; i ++) {
                 pipeline.fireChannelRead(readBuf.get(i));
             }
             readBuf.clear();
diff --git a/transport/src/main/java/io/netty/channel/nio/NioEventLoop.java b/transport/src/main/java/io/netty/channel/nio/NioEventLoop.java
index dfb76dd1f6..bff26f4514 100644
--- a/transport/src/main/java/io/netty/channel/nio/NioEventLoop.java
+++ b/transport/src/main/java/io/netty/channel/nio/NioEventLoop.java
@@ -472,9 +472,8 @@ public final class NioEventLoop extends SingleThreadEventLoop {
             return;
         }
 
-        int readyOps = -1;
         try {
-            readyOps = k.readyOps();
+            int readyOps = k.readyOps();
             if ((readyOps & (SelectionKey.OP_READ | SelectionKey.OP_ACCEPT)) != 0 || readyOps == 0) {
                 unsafe.read();
                 if (!ch.isOpen()) {
diff --git a/transport/src/main/java/io/netty/channel/oio/AbstractOioMessageChannel.java b/transport/src/main/java/io/netty/channel/oio/AbstractOioMessageChannel.java
index 9e1337d187..7fcd1045f5 100644
--- a/transport/src/main/java/io/netty/channel/oio/AbstractOioMessageChannel.java
+++ b/transport/src/main/java/io/netty/channel/oio/AbstractOioMessageChannel.java
@@ -47,7 +47,8 @@ public abstract class AbstractOioMessageChannel extends AbstractOioChannel {
             exception = t;
         }
 
-        for (int i = 0; i < readBuf.size(); i ++) {
+        int size = readBuf.size();
+        for (int i = 0; i < size; i ++) {
             pipeline.fireChannelRead(readBuf.get(i));
         }
         readBuf.clear();