Cleanup unnecessary code

reactor/src/main/java/com/iluwatar/reactor/framework/NioReactor.java

@@ -84,11 +84,8 @@ public class NioReactor {
 
   /**
    * Starts the reactor event loop in a new thread.
-   * 
-   * @throws IOException
-   *           if any I/O error occurs.
    */
-  public void start() throws IOException {
+  public void start() {
     reactorMain.execute(() -> {
       try {
         LOGGER.info("Reactor started, waiting for events...");

reactor/src/main/java/com/iluwatar/reactor/framework/NioServerSocketChannel.java

@@ -98,9 +98,9 @@ public class NioServerSocketChannel extends AbstractNioChannel {
    */
   @Override
   public void bind() throws IOException {
-    ((ServerSocketChannel) getJavaChannel()).socket().bind(
+    getJavaChannel().socket().bind(
         new InetSocketAddress(InetAddress.getLocalHost(), port));
-    ((ServerSocketChannel) getJavaChannel()).configureBlocking(false);
+    getJavaChannel().configureBlocking(false);
     LOGGER.info("Bound TCP socket at port: {}", port);
   }