Various behaviour of a code on jdk1.3.1 on windows and linux,solaris.

Various behaviour of a code .
Summary.
jdk1.3.1_xx windows - the code hangs.
jdk1.3.1_xx Solaris and Linux - the code does not hang.
jdk1.4.2 - jdk1.5 on all platforms the code does not hang.
                                                                                
code:
import java.awt.Frame;
                                                                                
public class A{
   public static void main(String argv[]){
          Frame testframe = new Frame("Title");
   }
}