FULL PRODUCT VERSION :
C:\Program Files\Java\jre1.5.0_06\bin>.\java -version
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP
Service Pack 2

A DESCRIPTION OF THE PROBLEM :
When using the Box class for a table cell renderer, you cannot set the background color.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the code provided and select different rows in the table.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
When selecting a row the entire row (both columns) should use the table selection color
ACTUAL -
The cells render with a Box are not rendered in the table selection color

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.Component;

import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableCellRenderer;

public class BoxSelector extends JFrame
{
	{
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		TableModel tableModel = new TableModel();
		Table table = new Table(tableModel);
		JScrollPane scrollPane = new JScrollPane(table);
		getContentPane().add(scrollPane);
		setBounds(200, 200, 200, 200);
		setVisible(true);
	}

	public static void main(String[] args)
	{
		new BoxSelector();
	}

	class Table extends JTable
	{

		public Table(TableModel tableModel)
		{
			super(tableModel);
			columnModel.getColumn(0).setCellRenderer(new BoxRenderer());
			columnModel.getColumn(1).setCellRenderer(new PanelRenderer());

		}
		class BoxRenderer implements TableCellRenderer
		{
			Box box = new Box(BoxLayout.X_AXIS);
			
			public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
			{
				if (isSelected)
					box.setBackground(Table.this.getSelectionBackground());
				else
					box.setBackground(Table.this.getBackground());

				return box;
			}
		}

		class PanelRenderer implements TableCellRenderer
		{
			JPanel panel = new JPanel();
			
			public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
			{
				if (isSelected)
					panel.setBackground(Table.this.getSelectionBackground());
				else
					panel.setBackground(Table.this.getBackground());

				return panel;
			}
		}
	}

	class TableModel extends AbstractTableModel
	{

		public int getColumnCount()
		{
			return 2;
		}

		public int getRowCount()
		{
			// TODO Auto-generated method stub
			return 2;
		}

		public Object getValueAt(int rowIndex, int columnIndex)
		{
			return null;
		}

	    public String getColumnName(int index)
	    {
	    	switch (index)
	    	{
	       		case 0: return "Box";
	       		case 1: return "JPanel";
	       		default: return null;
	    	}
	    }
	}
}

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

CUSTOMER SUBMITTED WORKAROUND :
Use the JPanel instead of Box