title: "Multiple markers at this line"
body: <p>I'm following the <a href="http://code.google.com/webtoolkit/doc/latest/tutorial/create.html" rel="nofollow">Stockwatcher</a> tutorial.</p>
  
  <p>When I try to run it I'm getting this error?: "Multiple markers at this line" (I have added a comment in that line below).</p>
  
  <pre><code>package com.google.gwt.sample.stockwatcher.client;
  
  import com.google.gwt.core.client.EntryPoint;
  import com.google.gwt.event.dom.client.ClickEvent;
  import com.google.gwt.event.dom.client.ClickHandler;
  import com.google.gwt.event.dom.client.KeyCodes;
  import com.google.gwt.event.dom.client.KeyPressEvent;
  import com.google.gwt.event.dom.client.KeyPressHandler;
  import com.google.gwt.i18n.client.NumberFormat;
  import com.google.gwt.user.client.ui.Label;
  import com.google.gwt.user.client.ui.Button;
  import com.google.gwt.user.client.ui.FlexTable;
  import com.google.gwt.user.client.ui.HorizontalPanel;
  import com.google.gwt.user.client.ui.TextBox;
  import com.google.gwt.user.client.ui.VerticalPanel;
  import com.google.gwt.user.client.ui.RootPanel;
  import com.google.gwt.user.client.Random;
  import com.google.gwt.user.client.Timer;
  import com.google.gwt.user.client.Window;
  import java.util.ArrayList;
  
  public class StockWatcher implements EntryPoint {
  
    private static final int REFRESH_INTERVAL = 5000;
    private VerticalPanel mainPanel = new VerticalPanel();
    private FlexTable stocksFlexTable = new FlexTable();
    private HorizontalPanel addPanel = new HorizontalPanel();
    private TextBox newSymbolTextBox = new TextBox();
    private Button addStockButton = new Button("Add");
    private Label lastUpdatedLabel = new Label();
    private ArrayList&lt;String&gt; stocks = new ArrayList&lt;String&gt;();
  
    /**
     * Entry point method.
     */
    public void onModuleLoad() {
  
      // Create table for stock data.
      stocksFlexTable.setText(0, 0, "Symbol");
      stocksFlexTable.setText(0, 1, "Price");
      stocksFlexTable.setText(0, 2, "Change");
      stocksFlexTable.setText(0, 3, "Remove");  
  
      // Assemble Add Stock panel.
      addPanel.add(newSymbolTextBox);
      addPanel.add(addStockButton);
  
      // Assemble Main panel.
      mainPanel.add(stocksFlexTable);
      mainPanel.add(addPanel);
      mainPanel.add(lastUpdatedLabel);
  
      // Associate the Main panel with the HTML host page.
      RootPanel.get("stockList").add(mainPanel);    
  
      // Move cursor focus to the input box.
      newSymbolTextBox.setFocus(true);
  
      // Setup timer to refresh list automatically.
      Timer refreshTimer = new Timer() {
        @Override
        public void run() {
          refreshWatchList();
        }
  
      };
      refreshTimer.scheduleRepeating(REFRESH_INTERVAL); //THIS IS THE LINE OF THE 
  
      // Listen for mouse events on the Add button.
      addStockButton.addClickHandler(new ClickHandler() {
        public void onClick(ClickEvent event) {
          addStock();
        }
      });
  
      // Listen for keyboard events in the input box.
      newSymbolTextBox.addKeyPressHandler(new KeyPressHandler() {
        public void onKeyPress(KeyPressEvent event) {
            System.out.println("foo=" + KeyCodes.KEY_ENTER);
            System.out.println("bar=" + (int)event.getCharCode());
          if (event.getCharCode() == KeyCodes.KEY_ENTER) {
  
  
            addStock();
          }
        }
      });
  
    }
  
    /**
     * Add stock to FlexTable. Executed when the user clicks the addStockButton or
     * presses enter in the newSymbolTextBox.
     */
    private void addStock() {
      final String symbol = newSymbolTextBox.getText().toUpperCase().trim();
      newSymbolTextBox.setFocus(true);
  
      // Stock code must be between 1 and 10 chars that are numbers, letters, or dots.
      if (!symbol.matches("^[0-9A-Z\\.]{1,10}$")) {
        Window.alert("'" + symbol + "' is not a valid symbol.");
        newSymbolTextBox.selectAll();
        return;
      }
  
      newSymbolTextBox.setText("");
  
      // Don't add the stock if it's already in the table.
      if (stocks.contains(symbol))
        return;
  
      // Add the stock to the table.
      int row = stocksFlexTable.getRowCount();
      stocks.add(symbol);
      stocksFlexTable.setText(row, 0, symbol);
  
      // Add a button to remove this stock from the table.
      Button removeStockButton = new Button("x");
      removeStockButton.addClickHandler(new ClickHandler() {
        public void onClick(ClickEvent event) {
          int removedIndex = stocks.indexOf(symbol);
          stocks.remove(removedIndex);        stocksFlexTable.removeRow(removedIndex + 1);
        }
      });
      stocksFlexTable.setWidget(row, 3, removeStockButton);
  
      // Get the stock price.
      refreshWatchList();
  
    }
  
    private void refreshWatchList() {
      final double MAX_PRICE = 100.0; // $100.00
      final double MAX_PRICE_CHANGE = 0.02; // +/- 2%
  
      StockPrice[] prices = new StockPrice[stocks.size()];
      for (int i = 0; i &lt; stocks.size(); i++) {
        double price = Random.nextDouble() * MAX_PRICE;
        double change = price * MAX_PRICE_CHANGE
            * (Random.nextDouble() * 2.0 - 1.0);
  
        prices[i] = new StockPrice(stocks.get(i), price, change);
      }
  
      updateTable(prices);
  
    }
  
    /**
     * Update the Price and Change fields all the rows in the stock table.
     *
     * @param prices Stock data for all rows.
     */
    private void updateTable(StockPrice[] prices) {
      for (int i = 0; i &lt; prices.length; i++) {
          updateTable(prices[i]);
        }
    }
  
    /**
     * Update a single row in the stock table.
     *
     * @param price Stock data for a single row.
     */
    private void updateTable(StockPrice price) {
      // Make sure the stock is still in the stock table.
      if (!stocks.contains(price.getSymbol())) {
        return;
      }
  
      int row = stocks.indexOf(price.getSymbol()) + 1;
  
      // Format the data in the Price and Change fields.
      String priceText = NumberFormat.getFormat("#,##0.00").format(
          price.getPrice());
      NumberFormat changeFormat = NumberFormat.getFormat("+#,##0.00;-#,##0.00");
      String changeText = changeFormat.format(price.getChange());
      String changePercentText = changeFormat.format(price.getChangePercent());
  
      // Populate the Price and Change fields with new data.
      stocksFlexTable.setText(row, 1, priceText);
      stocksFlexTable.setText(row, 2, changeText + " (" + changePercentText
          + "%)");
    }
  
  }
  </code></pre>
  
  <p>This is the stack of errors:</p>
  
  <pre><code>StockWatcher [Web Application]  
      com.google.gwt.dev.DevMode at localhost:56938   
          Thread [main] (Running) 
          Thread [Thread-1] (Running) 
          Daemon Thread [Thread-2] (Running)  
          Daemon Thread [UnitWriteThread] (Running)   
          Daemon Thread [Timer-0] (Running)   
          Daemon Thread [Code server listener] (Running)  
          Daemon Thread [com.google.gwt.thirdparty.guava.common.base.internal.Finalizer] (Running)    
          Thread [2048426764@qtp-774727454-1 - Acceptor0 SelectChannelConnector@0.0.0.0:8888] (Running)   
          Thread [2108438076@qtp-774727454-0] (Running)   
          Daemon Thread [Timer-1] (Running)   
          Daemon Thread [Code server for stockwatcher from Mozilla/5.0 (X11; Linux x86_64; rv:7.0.1) Gecko/20100101 Firefox/7.0.1 on http://127.0.0.1:8888/StockWatcher.html?gwt.codesvr=127.0.0.1:9997 @ 1hS?FL4(4E4"'T^J] (Suspended (breakpoint at line 67 in StockWatcher))   
              StockWatcher.onModuleLoad() line: 67    
              NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method]  
              NativeMethodAccessorImpl.invoke(Object, Object[]) line: 57  
              DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43  
              Method.invoke(Object, Object...) line: 601  
              ModuleSpaceOOPHM(ModuleSpace).onLoad(TreeLogger) line: 396  
              OophmSessionHandler.loadModule(BrowserChannelServer, String, String, String, String, String, byte[]) line: 200  
              BrowserChannelServer.processConnection() line: 525  
              BrowserChannelServer.run() line: 363    
              Thread.run() line: 722  
      /usr/lib/jdk1.7.0_01/bin/java (Nov 22, 2011 12:45:50 PM)    
  </code></pre>
  
  <p>Javi</p>