GroupLayout.linkSize() on two JTextEdit's makes them zero size

Question

I'm writing a Java program (minimum compilable example below), and I'm trying to pretty up the user interface by making some elements line up. If you run this, you can see that d_ip and d_pword would look a lot better if I could make them the same size. And I want them to dynamically stay the same size even when you resize the window.

GroupLayout has a linkSize() method that lets you link the sizes of unrelated objects. This works great with buttons and labels. But with JTextField, it's a disaster. Even if I set the minimum size on one of them to something large, it still insists on setting the sizes to zero.

I've also tried things like telling GroupLayout that the horizontal min and preferred sizes are GroupLayout.DEFAULT_SIZE or GroupLayout.PREFERRED_SIZE to no avail. Can anyone tell me if there is any way I can coerce JTextField to work properly with linkSize?

Note that to turn on the linkSize, there is a line, labeled with a comment, that you need to uncomment. When you do that, the JTextField widths get messed up. Also, try adding d_username to the list of linked objects. Now, even though theres 'tension,' you might say, to make the username/password row horizontally the width of the window, the fields go to zero size and won't resize.

Thanks!

package textfield;

import java.awt.Container;
import java.awt.Dimension;
import javax.swing.ButtonGroup;
import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
import javax.swing.UIManager;

public class TextField extends JFrame {
    JTextField d_mount, d_ip, d_share, d_username, d_pword;
    JRadioButton nfs, smb;
    JButton save, revert;

    TextField() {
        Container pane = this.getContentPane();

        JLabel lmount = new JLabel("Mount Point:");
        JLabel ltype = new JLabel("Share Type:");
        JLabel lip = new JLabel("IP Address:");
        JLabel lshare = new JLabel("Remote Share:");
        JLabel lusername = new JLabel("Username:");
        JLabel lpassword = new JLabel("Password:");

        d_mount = new JTextField();
        nfs = new JRadioButton("NFS");
        smb = new JRadioButton("SMB");
        ButtonGroup group = new ButtonGroup();
        group.add(nfs);
        group.add(smb);
        d_ip = new JTextField();
        d_share = new JTextField();
        d_username = new JTextField();
        d_pword = new JTextField();

        d_ip.setMinimumSize(new Dimension(200, 0));

        save = new JButton("Save");
        revert = new JButton("Revert");

        GroupLayout layout = new GroupLayout(pane);
        pane.setLayout(layout);

        layout.setVerticalGroup(
            layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                    .addComponent(lmount)
                    .addComponent(d_mount)
                    )
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                    .addComponent(ltype)
                    .addComponent(nfs)
                    .addComponent(smb)
                //    )
                //.addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                    .addComponent(lip)
                    .addComponent(d_ip)
                    )
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                    .addComponent(lshare)
                    .addComponent(d_share)
                    )
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE, true)
                    .addComponent(lusername)
                    .addComponent(d_username)
                    .addComponent(lpassword)
                    .addComponent(d_pword)
                )
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(GroupLayout.Alignment.BASELINE)
                    .addComponent(revert)
                    .addComponent(save)
                )
            );
        layout.setHorizontalGroup(
            layout.createParallelGroup()
                .addGroup(layout.createSequentialGroup()
                    .addGroup(layout.createParallelGroup(GroupLayout.Alignment.TRAILING)
                        .addComponent(lmount)
                        .addComponent(ltype)
                        .addComponent(lshare)
                        .addComponent(lusername)
                        )
                    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                    .addGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
                        .addComponent(d_mount)
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(nfs)
                            .addComponent(smb)
                            .addGap(20, 20, Integer.MAX_VALUE)
                            .addComponent(lip)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(d_ip, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            )
                        .addComponent(d_share)
                        .addGroup(layout.createSequentialGroup()
                            .addComponent(d_username, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                            .addComponent(lpassword)
                            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                            .addComponent(d_pword, GroupLayout.DEFAULT_SIZE, GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            )
                        )
                    )
                .addGroup(layout.createSequentialGroup()
                    .addGap(0, 0, Integer.MAX_VALUE)
                    .addComponent(revert)
                    .addComponent(save)
                    )
            );


        // ****** ADD THIS LINE BACK IN ******
        //layout.linkSize(SwingConstants.HORIZONTAL, d_pword, d_ip);

        pack();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        try {         
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());     
        }      catch (Exception e) {        
        }

        java.awt.EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                new TextField().setVisible(true);
            }
        });
    }
}

Answer 1

The immediate solution is to suggest a size in columns. Viz.

d_pword = new JTextField(15);

Notes:

• I disagree that the GUI looks best when those two fields are aligned. There is no logical connection between them, so linking the size seems irrelevant & misleading.
• The d_pword field should be a JPasswordField.

Answer 2

The underlying problem may be that it is if you linkSize two objects, both become inherently un-resizable.

That is if what this book says is true:

http://books.google.com/books?id=kELcexu0pAcC&pg=PA67&lpg=PA67&dq=grouplayout+linksize+resIzable&source=bl&ots=Syy_LnNd4W&sig=cLGV96RAJeYEeV2ZDt_bmeBZqCM&hl=en&sa=X&ei=bdDMT9mMJMms2gW8m6z1DA&ved=0CFMQ6AEwAw#v=onepage&q=grouplayout%20linksize%20resIzable&f=false