Exact column (row) size with GridBagLayout??

Hello there,
I have a question regarding GridBagLayout and EXACT (relative) dimensions
of columns and rows. Have you ever had (and solved) this problem? Thank you
for help!!
My situations: let's say I'd like to have two buttons, the first should fill
up 1/4 of the horizontal space and the second should fill up the remaining
3/4 of the space. But I'd like them to fill up the space EXACTLY (if there
is enough space of course, I'm not speaking about horizontal space 10
pixels...). I tried to achieve this by the following code:
GridBagLayout grid = new GridBagLayout();
getContentPane().setLayout(grid);
GridBagConstraints c = new GridBagConstraints();
// button1
JButton b1 = new JButton("A");
c.gridx = 0; c.gridy = 0;
c.gridwidth = 1; c.gridheight = 1;
c.weightx = 1.0; c.weighty = 1.0; // <--- weigthx is 1.0 the other
button will have 3.0
c.fill = GridBagConstraints.BOTH;
c.ipadx = 0; c.ipady = 0;
c.insets = new Insets(0,0,0,0);
grid.setConstraints(b1, c);
getContentPane().add(b1);
// button2
JButton b2 = new JButton("B");
c.gridx = 1; c.gridy = 0;
c.gridwidth = 1; c.gridheight = 1;
c.weightx = 3.0; c.weighty = 1.0; // <--- weigthx is 3.0 the first has
1.0
c.fill = GridBagConstraints.BOTH;
c.ipadx = 0; c.ipady = 0;
c.insets = new Insets(0,0,0,0);
grid.setConstraints(b2, c);
getContentPane().add(b2);
This really lays out the buttons in fashiion 1:3 but not exactly, there
always about 10-15 pixels that are extra...
I tried to have the weigthx in range <0, 1> so, the button b1 has weigthx =
0.25 and the second one has weigth = 0.75. But it does not work either...
Can you help me please?
David
ps. Why do I need this exact layout? Because I have 3 tabs (JTabbedPane) and
all of them display components with this 1:3 layout. But when I click on
different tabs I can see that the boundary betweeen the two components
"jumps" slightly from tab to tab which drives me crazy because things like
this should not be part of program that wants to look "professionally-done".

Ok, but I don't know the dimensions... I wanted the Layout manager to do the job. I was wondering, maybe I didn't set something else. But thank you!!
ps. how come that the layout manager displays the layout almost perfectly? the ratio is almost 1:3 but not exactly.

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