尝试为JTABLE行着色时出现NullPointerException

Question

我明白了：

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException 

..获取行的值：

String ENTRY = (String) table.getModel().getValueAt(row, 2)`

这是代码：

tab.setDefaultRenderer(Object.class, new DefaultTableCellRenderer() {
            @Override
public Component getTableCellRendererComponent(JTable table,
       Object value, boolean isSelected, boolean hasFocus, int row, int col) {

Super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, col);

String ENTRY = table.getModel().getValueAt(row,2).toString(); 

                if (!ENTRY.equals("active")) {
                    setBackground(Color.GREEN);
                }
                return this;
            }
        });`