JOptionPane.showOptionDialog shows no buttons?

The following code shows a dialog as expected, apart from having no buttons:

  final JPasswordField passwdField = new JPasswordField();
  passwdField.setColumns(20);
  final JComponent[] inputs = new JComponent[] {  passwdField };
  int res = JOptionPane.showOptionDialog(null, "Enter Password", "Login", 
                  JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, 
                  null, inputs, "");

shows the following dialog (Java 6.2?, Windows 7 64-Bit):

Why are there no OK / Cancel button? (btw, the dialog is not resizable, so I don't know if they are just outside the visible frame)

(Also, pressing Enter does开发者_C百科 not close the dialog, "x" closes the dialog)

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Your problem is with the inputs array. Read the API and it will tell you that it should be different. I usually use an array of String, each String representing a button String, or sometimes I use a mixture of Objects, mixing components and Strings. For e.g.,

  JPasswordField passField = new JPasswordField(10);
  Object[] inputs = {passField, "OK", "Cancel"};
  int res = JOptionPane.showOptionDialog(null, "Enter Password", "Login", 
           JOptionPane.OK_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE, 
           null, inputs, "");
  if (res == 1) {
     System.out.println("Password is: " + new String(passField.getPassword()));
  }