This may be a stupid question, but I have to ask!

I have the following code snippets that are supposed to run their corresponding methods when the user interacts with objects. For some reason, "foo" is never printed, but "bar" is.

myJSpinner1.addMouseListener(new java.awt.event.MouseAdapter() {
    public void mouseEntered(java.awt.event.MouseEvent evt() {
    System.out.println("foo"); //"foo" is not printed
  }
});

myJSpinner2.addChangeListener(new java.awt.event.ChangeListener() {
    public void stateChanged(java.awt.event.ChangeEvent evt() {
    System.out.println("bar"); //"bar" is printed
  }
});

I get no exceptions or stack trace. What am I missing in the MouseListener one? Thanks in advance.