Jscrollpane without scrollbar

adf bc swing appilcation, jdeveloper 10.1.3
this is my form structure
this (gridbag layout)
jscrollpane(default layout)
jpane (null layout)
jpane2
jtabbedpane
jscrollpane size < jpane size
why the scroll bar of the jscrollpane doesn't appear ??

Hi,
it only appears if there are components that are placed outside of the viewport. Add a table and if this is big enough it will cause the scrollbar to show.
You can however set the vertical scrollbar property to always show the scroll bar. By default it only shows it when needed
Frank

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Hi!
I just noticed a strange problem when packing a JScrollPane with scrollbar policy "as needed" and wondered if it's me or if it is a real bug in Swing.
I create a JFrame with a JScrollPane in it and a JPanel as viewportview. The JPanel (called "stuffPanel") contains a few components which give it a preferred size, and the JScrollPane is set to grow as needed if the window grows. A button in the center of the stuffPanel will invoke pack() on the window when clicked.
Now, if I resize the window such that the JScrollPane can't display the entire stuffPanel, I get scrollbars as expected. If I click the pack button the window correctly resizes to the preferred size (without scrollbars).
On the other hand, if I resize the window to become larger than the preferred size and then click the pack button, the window (and the stuffPanel) is resized to include 17 pixels of extra size around the edges.
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import java.awt.event.*;
import javax.swing.*;
public class TestJScrollPane {
static {
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      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    catch (Exception e) { }
private JFrame mainWindow;
public TestJScrollPane() {
    mainWindow = createMainWindow();
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    mainWindow.show();
public JFrame createMainWindow() {
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    final JPanel stuffPanel = new JPanel();
    stuffPanel.setBorder(BorderFactory.createTitledBorder("Collection of stuff"));
    stuffPanel.setLayout(new GridBagLayout());
    JLabel stuffLabel = new JLabel("A label");
    JTextField stuffField = new JTextField(10);
    JButton stuffButton = new JButton("Pack the window");
    JList listOfStuff = new JList();
    listOfStuff.setListData(new String[] {"Fish", "Bird", "Mammal", "Insect", "Spider"});
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    gbc.gridx = 0;
    gbc.gridy = 0;
    stuffPanel.add(stuffLabel, gbc);
    gbc.gridx = 1;
    stuffPanel.add(stuffField, gbc);
    gbc.gridy = 1;
    gbc.gridx = 0;
    gbc.gridwidth = 2;
    stuffPanel.add(stuffButton, gbc);
    gbc.gridy = 2;
    gbc.fill = GridBagConstraints.BOTH;
    stuffPanel.add(listOfStuff, gbc);
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    gbc = new GridBagConstraints();
    gbc.fill = GridBagConstraints.BOTH;
    gbc.weightx = 1;
    gbc.weighty = 1;
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      public void actionPerformed(ActionEvent e) {
        mainWindow.pack();
        System.out.println("Stuff panel size: " + stuffPanel.getSize());
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        System.out.println("Scroller size: " + scroller.getSize());
        System.out.println("Scroller preferred size: " + scroller.getPreferredSize());
    return window;
public static void main(String[] args) {
    new TestJScrollPane();
}

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This is a very common mistake. When you put a JPanel in a scrollpane, the scrollpane will use the panel's preferred size to determine if scrolling is needed or not. If the panel is using a LayoutManager this is generally done for you automatically. But in your case you set the layout to null, and then it is your responsibility to make sure that the getPreferredSize() method of the panel returns the correct size.
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Jscrollpane without scrollbar

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