Not able to add 3 JPanels to a main panel

Question

I have 3 JPanels and I want to place them all in one JPanel. I used the GridBagLayout for the main panel. But only one panel is getting added. Why might this be?

Answer 1

You might consider using a MigLayout instead, the code is much simpler:

panel1Customizer();
panel2customizer();
panel3Customizer();
setLayout(new MigLayout("fill, wrap 3"));

add(panel1, "grow");
add(panel2, "grow");
add(panel3, "grow");