Can't remove focus when validating

I have a validation on a JTextField that stops the user focussing on the next input field until the correct data is entered. Its simple and works like this:
private void docnumFieldFocusLost(java.awt.event.FocusEvent evt)
    if (!evt.isTemporary())
      if (!validDocnum())
       docnumField.requestFocusInWindow();
       docnumField.setBackground(new Color(251, 51, 0));
       displayMsg(errortype, title, msg);
}One option I want to give the user is to abandon the input altogether by clicking a Reset button (to return the field to blank) or Exit button (to leave the GUI completely). But I cant get out of the original focus on the docnumField.
I have tried:
private void resetButtonMouseClicked(java.awt.event.MouseEvent evt)
    docnumField.setRequestFocusEnabled(false);
    docnumField.setText("");
    resetValues();
}but the attempt to focus on the resetButton component fails because the other focus can't be broken. I would be most thankful for a suggestion to break this 'loop'.

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Can't remove focus when validating

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