Java Frame (Awt) does not appear on program execution in centos

I made a simple AWT program and made it as a jar file using eclipse on windows machine. After making jar, i sent it to my Centos virtual machine and used ssh to login. When i tried to execute the program, it provides no reply.

I installed Xvfb in Centos and set the DISPLAY variable as well. X11 forwarding is also enabled on PUTTY

Java code:

public class TestAWT{

    TestAWT()
    {
         JFrame test = new JFrame();
         test.setVisible(true);
         test.setSize(100,100);
         test.setResizable(false);
         test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String args[])
    {
        new TestAWT();
    }
}

Execution command:

java -jar testawt.jar
java -jar -Djava.awt.headless=true testawt.jar  -> Throwed Headless Exception

Could some please advise how to solve this problem?

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Link to original article：https://stackoverflow.com/questions/34291634/java-frame-awt-does-not-appear-on-program-execution-in-centos