Java gui colors dont load

Question

I've made a gui for my program and used

UIManager.put("Button.background", new Color(0,0,0));   
UIManager.put("JButton.background", new Color(0,0,0));

to make the buttons appear black. Unfortunately, this doesn't work sometimes. Without modifying the code, it will work when I run it one time and wont work another time.

The following image is the same button in the same program after several times I ran it. This happens about 1 in 4 times I run the program.

(left button is correct and the right one is what sometimes happens while running)

Also, other things like

UIManager.put("control", new Color(15,0,0));

are loading properly. Never had a problem with it and it's loaded at the same time and same format.

EDIT: Here's a sample code where the button colors aren't loading at all while the background and other things are. They are loaded the same exact way and there are no compilation or run errors.

import java.awt.*;
import javax.swing.*;
import javax.swing.UIManager.*;

public class gtst

{

public static void main(String[] args) throws Exception
{

    UIManager.put("Button.background", new Color(1,1,1));   
    UIManager.put("JButton.background", new Color(1,1,1));
    UIManager.put("control", new Color(0,0,0)); 
    UIManager.put("text", new Color(255,220,0));

    Frame batFrame = new JFrame("nananananna Batman!");

    for (LookAndFeelInfo info : UIManager.getInstalledLookAndFeels())
    {
        if ("Nimbus".equals(info.getName())) {
            UIManager.setLookAndFeel(info.getClassName());
            break;
        }
    }

    String username = JOptionPane.showInputDialog(batFrame, "Enter something...:");
    }
}

Answer 1

After days of non stop trial and error, I figured out that apparently in my program the MySQL connection was causing the problem. If the MySQL connection was initiated at the start of the program and the color changes were too this cause some sort of a problem (maybe lag?) and the colors wouldn't always load. Maybe it's a problem with the MySQL driver or something else, not sure, but to fix it I just made it connect to MySQL when it needed the connection rather than at the program start.

I'm not sure why the colors didn't load at all in the example I provided.

Answer 2

How I usually do this is I make a button as a seperate JButton variable and then add that to my panel. Then to set the color of the button I use the code:

myButton.setBackground(Color.BLACK);

and that usually does the trick.

Answer 3

Try using the following code after you have made the changes in the UIManager:

SwingUtilities.updateComponentTreeUI(<your_root_ui_componenet>);