GridBagLayout in Java Column Issue

Question

I'm trying to use the GridBagLayout layout manager to achieve this:

However, what I am currently getting is this:

The problem being that the orange and brown/gray panels are supposed to occupy the second column, but seem to only want to occupy the third when it comes to running the code.

The code that I'm using for the layout:

 Container contentPane = form.getContentPane();
    contentPane.setLayout(new GridBagLayout());
    GridBagConstraints c = new GridBagConstraints();

    JPanel pnlGame = new JPanel();
    pnlGame.setBackground(Color.green); //temp
    c.gridx = 0;
    c.gridy = 0;
    c.gridwidth = 2;
    c.gridheight = 2;
    c.fill = GridBagConstraints.BOTH;
    c.weightx = 0.85;
    c.weighty = 0.65;
    contentPane.add(pnlGame, c);

    JPanel pnlBuy = new JPanel();
    c.gridx = 2;
    pnlBuy.setBackground(Color.blue); //temp
    c.gridy = 0;
    c.gridwidth = 1;
    c.gridheight = 1;
    c.fill = GridBagConstraints.BOTH;
    c.weightx = 0.15;
    c.weighty = 0.46;
    contentPane.add(pnlBuy, c);

    JPanel pnlUpgrade = new JPanel();
    pnlUpgrade.setBackground(Color.yellow); //temp
    c.gridx = 2;
    c.gridy = 1;
    c.gridwidth = 1;
    c.gridheight = 1;
    c.fill = GridBagConstraints.BOTH;
    c.weightx = 0.15;
    c.weighty = 0.19;
    contentPane.add(pnlUpgrade, c);

    JPanel pnlStats = new JPanel();
    pnlStats.setBackground(Color.red); //temp
    c.gridx = 0;
    c.gridy = 2;
    c.gridwidth = 1;
    c.gridheight = 2;
    c.fill = GridBagConstraints.BOTH;
    c.weightx = 0.61;
    c.weighty = 0.35;
    contentPane.add(pnlStats, c);

    JPanel pnlSpeed = new JPanel();
    pnlSpeed.setBackground(Color.orange); //temp
    c.gridx = 1;
    c.gridy = 2;
    c.gridwidth = 2;
    c.gridheight = 1;
    c.fill = GridBagConstraints.BOTH;
    c.weightx = 0.38;
    c.weighty = 0.04;
    contentPane.add(pnlSpeed, c);

    JPanel pnlRounds = new JPanel();
    pnlRounds.setBackground(Color.gray); //temp
    c.gridx = 2;
    c.gridy = 3;
    c.gridwidth = 2;
    c.gridheight = 1;
    c.fill = GridBagConstraints.BOTH;
    c.weightx = 0.38;
    c.weighty = 0.31;
    contentPane.add(pnlRounds, c);

So, what am I doing wrong? Sorry if my English is a bit shitty, and/or the mistake I'm making is blindingly obvious... it's 20 to 5 in the morning, and I've had a long day. Should probably be hitting the hay, fairly shortly.

UPDATE:

It appears that if I change the gridwidth of the brown/gray panel, everything seems to align properly, but I end up with a nasty gap in my layout. Here:

i.imgur.com/6JUx2.png

And the code for the panel (including the amendment suggested by Kevin S):

JPanel pnlRounds = new JPanel();
pnlRounds.setBackground(Color.gray); //temp
c.gridx = 1;
c.gridy = 3;
c.gridwidth = 1;
c.gridheight = 1;
c.fill = GridBagConstraints.BOTH;
c.weightx = 0.38;
c.weighty = 0.31;
contentPane.add(pnlRounds, c);

So, is there anything that I'm doing wrong, or is this just some weird behaviour of the GridBagLayout that I'm going to have to live with?

Unfortunately, thanks to me editing, I've lost all the embeds that Bala R kindly put in there. So, we're back to the links for images, I'm afraid. And now it seems that I can't post more than two hyperlinks, so the link has been killed in the last one, you need to copy and paste it in.

Thanks, Sam

Answer 1

All the components in your middle column are at least in one other column as well. So the GridBagLayout calculates the preferred width of the middle column as 0, and this is the effect you are seeing.

If you want to make sure your middle column has more width, put some component there which is only in this column.