JPanels shrink when JFrame is resized

I'm making a video player with VLCJ; above and below I have two JPanels to display some information, and in the middle I have the canvas where the video is played. The problem is that when I resize the JFrame, the JPanels shrink and the Canvas expands, but when I place a button instead of the Canvas nothing changes. Do you know how to mantain the JPanels size when the JFrame is resized using GridBagLayout?

Snippet:

public class Test extends JFrame {
static Test frame;
static Canvas canvas;
static int video = 1;
JButton button;
public Test() {
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
JPanel followTo = new JPanel();
gbc.gridy=0;
gbc.weightx=1;
gbc.weighty= 0.11;
add(followTo, gbc);
canvas = new Canvas();
canvas.setBackground(Color.BLACK);  
//        button = new JButton();
gbc.gridy=1;
gbc.weightx=1;
gbc.weighty= 1.02;
gbc.fill= GridBagConstraints.BOTH;
add(canvas, gbc);
//        add(button, gbc);
JPanel controls = new JPanel();
gbc.gridy=2;
gbc.weightx=1;
gbc.weighty=0.16;
add(controls, gbc);
}
public static void main(String[] args) {
frame = new Test();
frame.setSize(1200-54,864);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// /* Comment when using JButton
NativeLibrary.addSearchPath(RuntimeUtil.getLibVlcLibraryName(),"C:\\Program Files\\VideoLAN\\VLC");
Native.loadLibrary(RuntimeUtil.getLibVlcLibraryName(), LibVlc.class);
MediaPlayerFactory mpf = new MediaPlayerFactory();
EmbeddedMediaPlayer emp = mpf.newEmbeddedMediaPlayer(new Win32FullScreenStrategy(frame));
emp.setVideoSurface(mpf.newVideoSurface(canvas));
emp.prepareMedia(url("Toulouse.mp4"));
emp.play();
// */
}
static String url (String video) {
String mrl = new Object().getClass().getResource("/media/guide.txt").getFile();
String url = mrl.replace("/", "\\").split("\\\\",2)[1].split("media")[0].concat("media\\"+video);
return url;
}
}

> The problem is that when I resize the JFrame, the JPanels shrink and the Canvas expands,

Well you are telling us what is happening, but you haven't told us what you EXPECT should happen.

I would guess the problem is the way you are using the weighty constraints.

Based on the code provided I would suggest you should NOT use a GridBagLayout, but instead use a BorderLayout.

Then the code for adding the panels to the frame would simply be:

add(followTo, BorderLayout.PAGE_START);
add(canvas, BorderLayout.CENTER);
add(controls, Borderlayout.PAGE_END):

Now as the frame size changes, all the space will be given to the component in the CENTER. The components at the top/bottom would remain fixed in height.

Note you should also NOT be using static variables in your code.