fixing close() connection when has't started error issue (NullPointerException)

Author: Kristijan Sedlak

src/net/tootallnate/websocket/WebSocketClient.java

@@ -120,9 +120,22 @@ public void close() throws IOException
   {    
 	  if (running)
 	  {
-		  running = false;  // must be called to stop do loop
-		  selector.wakeup();
-		  conn.close();		// synchronously calling onClose(conn)
+		  // must be called to stop do loop
+		  running = false;  
+		  
+		  // call this inside IF because it can be null if the connection has't started
+		  // but user is calling close()
+		  if (selector != null && conn != null)
+		  {
+			  selector.wakeup();
+			  conn.close();
+			  // close() is synchronously calling onClose(conn) so we don't have to
+		  }
+		  else
+		  {
+			  // connection has't started but the onClose events should be triggered
+			  onClose(conn);
+		  }
 	  }
   }
 
@@ -165,8 +178,13 @@ private boolean tryToConnect(InetSocketAddress remote) {
       selector = Selector.open();
 
       this.conn = new WebSocket(client, new LinkedBlockingQueue<ByteBuffer>(), this);
-      // At first, we're only interested in the 'CONNECT' keys.
-      client.register(selector, SelectionKey.OP_CONNECT);
+      // the client/selector can be null when closing the connection before its start
+      // so we have to call this part inside IF
+      if (client != null)
+      {
+          // At first, we're only interested in the 'CONNECT' keys.
+          client.register(selector, SelectionKey.OP_CONNECT);
+      }
 
     } catch (IOException ex) {
     	onIOError(conn, ex);