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J'ai trouvé le code des deux classes ainsi qu'un exemple d'utilisation si ca peut t'aider :

XGridBag

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package exemple; /* Ce code est dans le domain public */
 
import java.awt.Component;
import java.awt.Container;
import java.awt.GridBagConstraints;
 
/**
 * The <code>XGridBag</code> helps to use the GridBagConstraints.<br>
 * This class defines styles reusable by differents components in a grid.
 *
 * To create a layout do the following step:<br>
 * - create a <code>GridBagLayout</code> and a XGridBag</code>.<br>
 * - prepare the components size (min/prefered/max).<br>
 * - create one or more style using <code>CellStyle.getStyle</code> method<br>
 * - add components to the grid using the <code>XGridBag.add</code> method.<br>
 * <br>
 * Example:<br>
 * <code>
 *   GridBagLayout layout = new GridBagLayout();<br>
 *   panel.setLayout(layout);<br>
 *   XGridBag grid = new XGridBag(panel);<br>
 *   <br>
 *   CellStyle style1 = new CellStyle(1.0, 0.0,<br>
 *      GridBagConstraints.WEST, GridBagConstraints.VERTICAL, insets, 4, 0);<br>
 *   ...<br>
 *   grid.add(comp1, style1, 0, 0);<br>
 *   grid.add(comp2, style1, 0, 1);<br>
 *   grid.add(comp3, style2, 1, 0);<br>
 *   ..<br>
 * </code>
 * @see CellStyle
 * @see java.awt.GridBagConstraints
 * @see java.awt.Insets
 */
public class XGridBag extends GridBagConstraints {
 
    public Container container;
 
    /**
     * Add a component to the container.
     * The component occupy only one cell width and heigth.
     *
     * @param c component to add
     * @param style cell style
     * @param row first Y cell
     * @param col first X cell
     * @see CellStyle
     */
    public void add(Component c, CellStyle style, int row, int col) {
        add(c, style, row, col, 1, 1);
    }
 
    /**
     * Add a component to the container.
     *
     * @param c component to add
     * @param style cell style
     * @param row first Y cell
     * @param col first X cell
     * @param rowHeight number of cells in a column (use GridBagConstraints.REMAINDER to fill out all rows to the end).
     * @param colWidth number of cells in a row (use GridBagConstraints.REMAINDER to fill out all columns to the end).
     * @see CellStyle
     */
    public void add(Component c, CellStyle style, int row, int col,
        int rowHeight, int colWidth) {
        this.gridx = col;
        this.gridy = row;
        this.gridwidth = colWidth;
        this.gridheight = rowHeight;
        this.fill = style.fill;
        this.ipadx = style.ipadx;
        this.ipady = style.ipady;
        this.insets = style.insets;
        this.anchor = style.anchor;
        this.weightx = style.weightx;
        this.weighty = style.weighty;
        container.add(c, this);
    }
 
    /**
     * XGridBag constructor.
     * @param container
     */
    public XGridBag(Container container) {
        super();
        this.container = container;
    }
 
}

CellStyle

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package exemple; /* Ce code est dans le domain public */
 
import java.awt.Insets;
 
/**
 * Define a cell style used by XGridBag.
 *
 * @see XGridBag
 * @see java.awt.GridBagConstraints
 */
public class CellStyle {
 
    /**
     * anchor CENTER, NORTH, NORTHEAST, EAST, SOUTHEAST, SOUTH, SOUTHWEST, WEST, NORTHWEST.
     */
    int anchor;
 
    /**
     * fill NONE, HORIZONTAL, VERTICAL, BOTH
     */
    int fill;
 
    /**
     * insets (int top, int left, int bottom, int right)
     */
    Insets insets;
 
    /**
     * internal X padding
     */
    int ipadx;
 
    /**
     * internal Y padding
     */
    int ipady;
 
    /**
     * extra X space (none=0.0 ... all=1.0)
     */
    double weightx;
 
    /**
     * extra Y space (none=0.0 ... all=1.0)
     */
    double weighty;
 
    /**
     * CellStyle constructor.
     *
     * @param weightx extra X space usage (none=0.0 ... all=1.0)
     * @param weighty extra Y space usage (none=0.0 ... all=1.0)
     * @param anchor location if component doesn't occupy entire cell:
     * <br><code>
     * --------------------------------------------------<br>
     * |FIRST_LINE_START...PAGE_START.....FIRST_LINE_END|<br>
     * |LINE_START...........CENTER.............LINE_END|<br>
     * |LAST_LINE_START.....PAGE_END.......LAST_LINE_END|<br>
     * --------------------------------------------------<br>
     * <code>
     * @param fill NONE, HORIZONTAL, VERTICAL, BOTH
     * @param insets (int top, int left, int bottom, int right)
     * @param ipadx internal X padding
     * @param ipady internal Y padding
     *
     * @see XGridBag
     * @see java.awt.GridBagConstraints
     * @see java.awt.Insets
     */
    public CellStyle(double weightx, double weighty,
        int anchor, int fill, Insets insets, int ipadx, int ipady) {
        super();
        this.fill = fill;
        this.ipadx = ipadx;
        this.ipady = ipady;
        this.insets = insets;
        this.anchor = anchor;
        this.weightx = weightx;
        this.weighty = weighty;
    }
 
}

Exemple d'utilisation

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package exemple; /* Ce code est dans le domain public */
 
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
 
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JSpinner;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.ScrollPaneConstants;
import javax.swing.UIManager;
import javax.swing.border.EmptyBorder;
 
import org.argil.swing.CellStyle;
import org.argil.swing.XGridBag;
 
public class DemoGridBag {
 
    public static void main(String[] args) throws Exception {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager
                        .getSystemLookAndFeelClassName());
                } catch (Exception e) {
                    throw new RuntimeException(e);
                }
                DemoGridBag demo = new DemoGridBag();
                JFrame frame = new JFrame("Formulaire");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                demo.createLayout(frame);
                frame.setLocationByPlatform(true);
                frame.pack();
                frame.setVisible(true);
            }
        });
    }
 
    JLabel lbhPresentation = new JLabel(
        "<html><b>Demande d'inscription au stage de fin d'étude:</b>"
            + "<dl><dd>Remplir ce formulaire avant le 10 mai."
            + " Préciser la zone géographique.");
 
    JLabel lbhSujet = new JLabel("Sujet du stage:");
 
    JLabel lbNom = new JLabel("Nom:");
 
    JLabel lbPrenom = new JLabel("Prénom:");
 
    JLabel lbAge = new JLabel("Age:");
 
    JTextField tfSujet = new JTextField("");
 
    JSpinner spinnerAge = new JSpinner();
 
    JComboBox boxSexe = new JComboBox(new Object[] {
        "Masculin", "Féminin"
    });
 
    JLabel lbSexe = new JLabel("Sexe:");
 
    JTextField tfNom = new JTextField("Dupond");
 
    JTextField tfPrenom = new JTextField("Pierre");
 
    JTextArea txtSujet = new JTextArea(
        "Réaliser un logiciel graphique de calcul de contraintes mécaniques en langage Java.\n"
            + "De préférence au sud ouest de Paris.");
 
    JScrollPane txtPane = new JScrollPane(txtSujet,
        ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
        ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED);
 
    private void createLayout(JFrame frame) {
        // Créer le layout
        JPanel panel = (JPanel) frame.getContentPane();
        panel.setBorder(new EmptyBorder(6, 6, 6, 6));
        GridBagLayout layout = new GridBagLayout();
        panel.setLayout(layout);
 
        // Créer les inserts (insets)
        Insets cellInsets = new Insets(2, 2, 2, 2);
        Insets cellInsets2 = new Insets(2, 12, 2, 2);
 
        // Préparer les composants
        Dimension dimSpinner = spinnerAge.getPreferredSize();
        Dimension dimBox = boxSexe.getPreferredSize();
        int maxH = Math.max(dimSpinner.height, dimBox.height);
        setHeigth(spinnerAge, maxH);
        setWidth(spinnerAge, 40);
        setHeigth(boxSexe, maxH);
        setWidth(boxSexe, 80);
 
        txtSujet.setRows(3);
        txtSujet.setLineWrap(true);
        txtSujet.setWrapStyleWord(true);
 
        // Créer les styles de cellule
        CellStyle titleStyle = new CellStyle(0.0, 0.0,
            GridBagConstraints.FIRST_LINE_START, GridBagConstraints.BOTH,
            new Insets(12, 2, 2, 2), 2, 0);
        CellStyle fixStyle = new CellStyle(0.0, 0.0,
            GridBagConstraints.LINE_START, GridBagConstraints.NONE, cellInsets,
            2, 4);
        CellStyle fixStyle2 = new CellStyle(0.0, 0.0,
            GridBagConstraints.LINE_START, GridBagConstraints.NONE, cellInsets2,
            2, 4);
        CellStyle varHStyle = new CellStyle(0.0, 0.0,
            GridBagConstraints.LINE_START, GridBagConstraints.HORIZONTAL,
            cellInsets, 2, 0);
        CellStyle varHVStyle = new CellStyle(1.0, 1.0,
            GridBagConstraints.FIRST_LINE_START, GridBagConstraints.BOTH,
            cellInsets, 2, 0);
 
        // Ajouter les composants
        XGridBag g = new XGridBag(panel);
        // Row 0
        g.add(lbhPresentation, titleStyle, 0, 0, 1, 5);
        // Row 1
        g.add(lbNom, fixStyle, 1, 0);
        g.add(tfNom, varHStyle, 1, 1, 1, 4);
        // Row 2
        g.add(lbPrenom, fixStyle, 2, 0);
        g.add(tfPrenom, varHStyle, 2, 1, 1, 4);
        // Row 3
        g.add(lbAge, fixStyle, 3, 0);
        g.add(spinnerAge, fixStyle, 3, 1);
        g.add(lbSexe, fixStyle2, 3, 2);
        g.add(boxSexe, fixStyle, 3, 3);
        // Row 4
        g.add(lbhSujet, titleStyle, 4, 0, 1, 5);
        // Row 5
        g.add(txtPane, varHVStyle, 5, 0, 1, 5);
    }
 
    private static void setHeigth(JComponent c, int h) {
        Dimension dim = c.getPreferredSize();
        dim.height = h;
        c.setPreferredSize(dim);
        c.setMinimumSize(dim);
        c.setMaximumSize(dim);
    }
 
    private static void setWidth(JComponent c, int w) {
        Dimension dim = c.getPreferredSize();
        System.out.println(dim);
        dim.width = w;
        c.setPreferredSize(dim);
        c.setMinimumSize(dim);
        c.setMaximumSize(dim);
    }
}