Swing in java

I am trying to add two label and two combobox horizontally like this
label1 combobox1
label2 combobox2
in below code "SwingConstants.LEFT "shows me right label and combobox.But for next label and combobox i set "SwingConstants.BOTTOM" and it gives me erroor "java.lang.IllegalArgumentException: horizontalAlignment"
protected JComponent getNewAdditionalPane() {
JPanel wAnswer = new JPanel();
wAnswer.setLayout(new BoxLayout(wAnswer, BoxLayout.X_AXIS));
wAnswer.setBorder(BorderFactory.createTitledBorder(CfoTextRef.lookup ("KEY_CardPropertiesConstant"))); //$NON-NLS-1$
JLabel wTabLabel = new JLabel(CfoTextRef.lookup("KEY_TablabelPfxStaticTextLabel2") + " ", SwingConstants.LEFT); //$NON-NLS-1$ //$NON-NLS-2$
JLabel wTabLabel1 = new JLabel(CfoTextRef.lookup("KEY_TablabelPfxStaticTextLabel4") + " ", SwingConstants.BOTTOM); //$NON-NLS-1$ //$NON-NLS-2$
wAnswer.add(wTabLabel);
wAnswer.add(wTabLabel1);
wAnswer.add(getTabLabelComboBox());
wAnswer.add(getTabLabel1ComboBox());
wAnswer.add(Box.createHorizontalGlue());
return wAnswer;
}

That's because BOTTOM is not a horizontal alignment property.

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