Better null check

src/main/java/org/jboss/netty/handler/codec/http/DefaultHttpMessage.java

@@ -47,6 +47,9 @@ public class DefaultHttpMessage implements HttpMessage {
     private ChannelBuffer content = ChannelBuffers.EMPTY_BUFFER;
 
     protected DefaultHttpMessage(final HttpVersion version) {
+        if (version == null) {
+            throw new NullPointerException("version");
+        }
         this.version = version;
     }
 

src/main/java/org/jboss/netty/handler/codec/http/DefaultHttpRequest.java

@@ -37,6 +37,12 @@ public class DefaultHttpRequest extends DefaultHttpMessage implements HttpReques
 
     public DefaultHttpRequest(HttpVersion httpVersion, HttpMethod method, String uri) {
         super(httpVersion);
+        if (method == null) {
+            throw new NullPointerException("method");
+        }
+        if (uri == null) {
+            throw new NullPointerException("uri");
+        }
         this.method = method;
         this.uri = uri;
     }

src/main/java/org/jboss/netty/handler/codec/http/DefaultHttpResponse.java

@@ -34,6 +34,9 @@ public class DefaultHttpResponse extends DefaultHttpMessage implements HttpRespo
 
     public DefaultHttpResponse(HttpVersion version, HttpResponseStatus status) {
         super(version);
+        if (status == null) {
+            throw new NullPointerException("status");
+        }
         this.status = status;
     }