FULL PRODUCT VERSION :
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Mac OS X Mavericks (same results on Snow Leopard, probably all.)

A DESCRIPTION OF THE PROBLEM :
Using GroupLayout, an alignment of LEADING does not result in the components visually aligning to the left (assuming LTR orientation.)

Screenshots of the issue can be found here:
http://stackoverflow.com/questions/21627970/


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Components should align such that you can draw a vertical line down the screen and touch the leftmost border of each component.

ACTUAL -
Buttons indent out several pixels to the right. Other components all have their own pixel amount which they jut out. Only basic components like JPanel reliably align.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.BorderFactory;
import javax.swing.GroupLayout;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.LayoutStyle;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;

public class ButtonVisualMarginTest implements Runnable {
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new ButtonVisualMarginTest());
    }

    @Override
    public void run() {
        LayoutStyle.setInstance(new AquaLayoutStyle());

        JComponent reference = new JComponent() {};
        reference.setName("reference component");
        reference.setPreferredSize(new Dimension(200, 50));
        reference.setMaximumSize(new Dimension(200, 50));
        reference.setBorder(BorderFactory.createLineBorder(Color.RED));

// JButton reference = new JButton("Another button");
// reference.setName("another button");
// reference.setFocusable(false);

        JButton button = new JButton("Text only");
        button.setName("button");
        button.setFocusable(false);

        JPanel container = new JPanel();
        container.setName("container");
        GroupLayout layout = new GroupLayout(container);
        layout.setAutoCreateGaps(true);
        layout.setAutoCreateContainerGaps(true);
        container.setLayout(layout);
        container.setBackground(new Color(192, 192, 255));
        container.setOpaque(true);

        layout.setHorizontalGroup(layout.createParallelGroup(GroupLayout.Alignment.LEADING)
            .addComponent(reference)
            .addComponent(button));

        layout.setVerticalGroup(layout.createSequentialGroup()
            .addComponent(reference)
            .addComponent(button));

        JFrame frame = new JFrame("Test");
        frame.setLayout(new BorderLayout());
        frame.add(container, BorderLayout.CENTER);
        frame.setSize(400, 300);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setVisible(true);

    }
}

---------- END SOURCE ----------