Remove redundant no-arg constructors

codec-http/src/main/java/io/netty/handler/codec/http/HttpRequestEncoder.java

@@ -25,12 +25,6 @@ import io.netty.util.CharsetUtil;
  */
 public class HttpRequestEncoder extends HttpMessageEncoder {
 
-    /**
-     * Creates a new instance.
-     */
-    public HttpRequestEncoder() {
-    }
-
     @Override
     protected void encodeInitialLine(ByteBuf buf, HttpMessage message) throws Exception {
         HttpRequest request = (HttpRequest) message;

codec-http/src/main/java/io/netty/handler/codec/http/HttpResponseEncoder.java

@@ -25,12 +25,6 @@ import io.netty.util.CharsetUtil;
  */
 public class HttpResponseEncoder extends HttpMessageEncoder {
 
-    /**
-     * Creates a new instance.
-     */
-    public HttpResponseEncoder() {
-    }
-
     @Override
     protected void encodeInitialLine(ByteBuf buf, HttpMessage message) throws Exception {
         HttpResponse response = (HttpResponse) message;

codec-http/src/main/java/io/netty/handler/codec/spdy/DefaultSpdyNoOpFrame.java

@@ -20,12 +20,6 @@ package io.netty.handler.codec.spdy;
  */
 public class DefaultSpdyNoOpFrame implements SpdyNoOpFrame {
 
-    /**
-     * Creates a new instance.
-     */
-    public DefaultSpdyNoOpFrame() {
-    }
-
     @Override
     public String toString() {
         return getClass().getSimpleName();

codec-http/src/main/java/io/netty/handler/codec/spdy/DefaultSpdySettingsFrame.java

@@ -29,12 +29,6 @@ public class DefaultSpdySettingsFrame implements SpdySettingsFrame {
     private boolean clear;
     private final Map<Integer, Setting> settingsMap = new TreeMap<Integer, Setting>();
 
-    /**
-     * Creates a new instance.
-     */
-    public DefaultSpdySettingsFrame() {
-    }
-
     @Override
     public Set<Integer> getIds() {
         return settingsMap.keySet();

codec-http/src/main/java/io/netty/handler/codec/spdy/SpdySession.java

@@ -29,9 +29,6 @@ final class SpdySession {
     private final Map<Integer, StreamState> activeStreams =
         new ConcurrentHashMap<Integer, StreamState>();
 
-    SpdySession() {
-    }
-
     int numActiveStreams() {
         return activeStreams.size();
     }

codec/src/main/java/io/netty/handler/codec/protobuf/ProtobufVarint32FrameDecoder.java

@@ -42,12 +42,6 @@ public class ProtobufVarint32FrameDecoder extends ByteToMessageDecoder<Object> {
     // TODO maxFrameLength + safe skip + fail-fast option
     //      (just like LengthFieldBasedFrameDecoder)
 
-    /**
-     * Creates a new instance.
-     */
-    public ProtobufVarint32FrameDecoder() {
-    }
-
     @Override
     public Object decode(ChannelHandlerContext ctx, ByteBuf in) throws Exception {
         in.markReaderIndex();

codec/src/main/java/io/netty/handler/codec/sctp/SctpMessageCompletionHandler.java

@@ -28,11 +28,6 @@ import java.util.Map;
 public class SctpMessageCompletionHandler extends ChannelInboundMessageHandlerAdapter<SctpMessage> {
     private Map<Integer, ByteBuf> fragments = new HashMap<Integer, ByteBuf>();
 
-    /**
-     */
-    public SctpMessageCompletionHandler() {
-    }
-
     @Override
     public void messageReceived(ChannelHandlerContext ctx, SctpMessage msg) throws Exception {