Setting up a JScrollPane ?

[Dillinger4]

Im trying to create a JScrollPane that contains a JList which is populated with entries which are just Strings. For some reason i get nothing visually at all. When i set the JScrollPane to use scrollbars all of the time what is the default size of the JScrollPane?

public GUI(){
JScrollPane jsp = new JScrollPane();
  jsp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); 
  jsp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
}