Thread: GUI freezes instead of showing JProgressBar

https://i.ibb.co/SJPQQvb/progress.png

This is what I see, but I shoulw see somthing like this:
https://i.ibb.co/YQh2J87/progress.png

this is my code

  JFrame frame = new JFrame();
    JProgressBar barra;
    HOME home;
    int massimo;
    Thread thread = null;
 
    public BARRA_PROGRESSO(int minimo, int m, HOME h) {
        massimo = m;
        home = h;
 
        /*   BigDecimal risultato = minimo .divide(dividi);
Integer.parseInt(new DecimalFormat("#")).format(risultato + "");*/
        barra = new JProgressBar(0, m);
 
        frame.add(barra);
        barra.setBackground(Color.WHITE);
        barra.setStringPainted(true);
        barra.setFont(new java.awt.Font("Tahoma", 1, 30)); // NOI18N
        barra.setBounds(0, 0, 500, 100);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500, 200);
        frame.setLayout(null);
        frame.setVisible(true);
        //   barra.setForeground(new java.awt.Color(45, 60, 128));
        thread = new Thread(new Runnable() {
            public void run() {
                sistema_percentuale_();
            }
        });
 
        thread.start();
 
    }
 
    public void sistema_percentuale_() {
 
        while (true) {
            try {
                Thread.sleep(10);
                BigDecimal boh = home.conta_barra.divide(home.dividi_progress_bar);
 
                System.out.println(
                        boh.multiply(new BigDecimal("100")).divide(new BigDecimal(massimo + ""), RoundingMode.HALF_DOWN) + "%");
 
                barra.setValue(Integer.parseInt(new DecimalFormat("#").format(boh)));
            } catch (Exception e) {
                System.out.println("BARRA_PROGRESSO.sistema_percentuale_()" + e);
            }
        }
 
    }
 
}

The posted code does not compile for testing because of missing import statements.
Also there is no main method for starting execution.
Please correct the code.

Please edit your post and wrap your code with code tags:

[code]
**YOUR CODE GOES HERE**
[/code]

to get highlighting and preserve formatting.

I can't help if I can not compile and execute the code for testing.

I get these compiler errors:

Running: C:\Program Files\Java\jdk1.8.0_60\bin\javac.exe -cp .;D:\JavaDevelopment -Xlint -Xdiags:verbose BARRA_PROGRESSO.java

BARRA_PROGRESSO.java:10: error: cannot find symbol
JFrame frame = new JFrame();
^
symbol: class JFrame
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:11: error: cannot find symbol
JProgressBar barra;
^
symbol: class JProgressBar
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:12: error: cannot find symbol
HOME home;
^
symbol: class HOME
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:15: error: cannot find symbol
public BARRA_PROGRESSO(int minimo, int m, HOME h) {
^
symbol: class HOME
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:10: error: cannot find symbol
JFrame frame = new JFrame();
^
symbol: class JFrame
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:21: error: cannot find symbol
barra = new JProgressBar(0, m);
^
symbol: class JProgressBar
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:24: error: cannot find symbol
barra.setBackground(Color.WHITE);
^
symbol: variable Color
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:28: error: cannot find symbol
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOS E);
^
symbol: variable JFrame
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:48: error: cannot find symbol
BigDecimal boh = home.conta_barra.divide(home.dividi_progress_bar);
^
symbol: class BigDecimal
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:51: error: cannot find symbol
boh.multiply(new BigDecimal("100")).divide(new BigDecimal(massimo + ""), RoundingMode.HALF_DOWN) + "%");
^
symbol: class BigDecimal
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:51: error: cannot find symbol
boh.multiply(new BigDecimal("100")).divide(new BigDecimal(massimo + ""), RoundingMode.HALF_DOWN) + "%");
^
symbol: variable RoundingMode
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:51: error: cannot find symbol
boh.multiply(new BigDecimal("100")).divide(new BigDecimal(massimo + ""), RoundingMode.HALF_DOWN) + "%");
^
symbol: class BigDecimal
location: class BARRA_PROGRESSO
BARRA_PROGRESSO.java:53: error: cannot find symbol
barra.setValue(Integer.parseInt(new DecimalFormat("#").format(boh)));
^
symbol: class DecimalFormat
location: class BARRA_PROGRESSO
13 errors

13 error(s)

Also there is no main method.

Sorry, I do not use an IDE that does that. I need the full code that compiles and executes for testing. I don't want to have to add anything to the code. The code needs to be complete and ready to compile. For example the Home class is missing.

If you want help, I suggest you provide complete code. Do not expect me to write any code.

The graphic of code that you posted correctly displays a progressbar, albeit in an infinite loop.
The problem may be how calculate or get value of boh variable, and if there is correct increment of numbers.