Improve logging

Author: jfarcand

src/main/java/com/ning/http/client/providers/netty/NettyAsyncHttpProvider.java

@@ -196,7 +196,7 @@ public NettyAsyncHttpProvider(AsyncHttpClientConfig config) {
                 e = Executors.newCachedThreadPool();
             }
             int numWorkers = config.getIoThreadMultiplier() * Runtime.getRuntime().availableProcessors();
-            log.info("Number of application's worked threads is {}", numWorkers);
+            log.debug("Number of application's worked threads is {}", numWorkers);
             socketChannelFactory = new NioClientSocketChannelFactory(e, config.executorService(), numWorkers);
         }
         plainBootstrap = new ClientBootstrap(socketChannelFactory);

src/main/java/com/ning/http/client/providers/netty/NettyConnectListener.java

@@ -92,7 +92,8 @@ public final void operationComplete(ChannelFuture f) throws Exception {
 
             logger.debug("Failed to recover from exception: {} with channel {}", cause, f.getChannel());
 
-            ConnectException e = new ConnectException(f.getCause() != null ? cause.getMessage() + " to " + future.getURI().toString(): future.getURI().toString());
+            boolean printCause = f.getCause() != null && cause.getMessage() != null;
+            ConnectException e = new ConnectException( printCause ? cause.getMessage() + " to " + future.getURI().toString() : future.getURI().toString());
             if (cause != null) {
                 e.initCause(cause);
             }