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To arrange Java Swing components in a vertical manner using GridBagLayout, you need to define the row and column constraints so that the components will be placed vertically.

Here's an example:

JPanel panel = new JPanel(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();

// First component
JButton button1 = new JButton("Button 1");
c.gridx = 0;
c.gridy = 0;
c.fill = GridBagConstraints.HORIZONTAL;
panel.add(button1, c);

// Second component
JButton button2 = new JButton("Button 2");
c.gridx = 0;
c.gridy = 1;
c.fill = GridBagConstraints.HORIZONTAL;
panel.add(button2, c);

// Third component
JButton button3 = new JButton("Button 3");
c.gridx = 0;
c.gridy = 2;
c.fill = GridBagConstraints.HORIZONTAL;
panel.add(button3, c);

In the example above, we have defined the GridBagConstraints to place each component vertically in a separate row. The gridx value is set to 0, which means all components will be in the same column. The gridy value is set to an increasing number for each component to place them in separate rows. Setting the fill value to GridBagConstraints.HORIZONTAL ensures that the components will be stretched horizontally to fill the available space.

You can adjust the constraints to suit your needs, such as adding padding or setting the preferred size of the components.