Don't use System.err for logging

Author: slandelle

client/src/test/java/org/asynchttpclient/reactivestreams/HttpStaticFileServerHandler.java

@@ -15,6 +15,10 @@
  */
 package org.asynchttpclient.reactivestreams;
 
+import static io.netty.handler.codec.http.HttpHeaders.Names.*;
+import static io.netty.handler.codec.http.HttpMethod.GET;
+import static io.netty.handler.codec.http.HttpResponseStatus.*;
+import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.ChannelFuture;
@@ -36,6 +40,7 @@
 import io.netty.handler.ssl.SslHandler;
 import io.netty.handler.stream.ChunkedFile;
 import io.netty.util.CharsetUtil;
+
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.RandomAccessFile;
@@ -48,13 +53,12 @@
 import java.util.Locale;
 import java.util.TimeZone;
 import java.util.regex.Pattern;
+
 import javax.activation.MimetypesFileTypeMap;
-import org.asynchttpclient.test.TestUtils;
 
-import static io.netty.handler.codec.http.HttpHeaders.Names.*;
-import static io.netty.handler.codec.http.HttpMethod.GET;
-import static io.netty.handler.codec.http.HttpResponseStatus.*;
-import static io.netty.handler.codec.http.HttpVersion.HTTP_1_1;
+import org.asynchttpclient.test.TestUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 
 /**
@@ -105,6 +109,7 @@
  */
 public class HttpStaticFileServerHandler extends SimpleChannelInboundHandler<FullHttpRequest> {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(HttpStaticFileServerHandler.class);
     public static final String HTTP_DATE_FORMAT = "EEE, dd MMM yyyy HH:mm:ss zzz";
     public static final String HTTP_DATE_GMT_TIMEZONE = "GMT";
     public static final int HTTP_CACHE_SECONDS = 60;
@@ -204,15 +209,15 @@ public void channelRead0(ChannelHandlerContext ctx, FullHttpRequest request) thr
             @Override
             public void operationProgressed(ChannelProgressiveFuture future, long progress, long total) {
                 if (total < 0) { // total unknown
-                    System.err.println(future.channel() + " Transfer progress: " + progress);
+                    LOGGER.info(future.channel() + " Transfer progress: " + progress);
                 } else {
-                    System.err.println(future.channel() + " Transfer progress: " + progress + " / " + total);
+                    LOGGER.info(future.channel() + " Transfer progress: " + progress + " / " + total);
                 }
             }
 
             @Override
             public void operationComplete(ChannelProgressiveFuture future) {
-                System.err.println(future.channel() + " Transfer complete.");
+                LOGGER.info(future.channel() + " Transfer complete.");
             }
         });