import java.util.Comparator;
 import org.apache.commons.beanutils.PropertyUtils;
 import org.apache.commons.collections.comparators.ComparableComparator;

 public class BeanComparator implements Comparator {

    private String attribute;
   private Comparator comp = new ComparableComparator();

    public BeanComparator(String attrib) {
        this.attribute = attrib;
    }

    public int compare(Object o1, Object o2) {
        if(o1 == null) {
            return 1;
        } else
       if(o2 == null) {
            return -1;
        }
       
        try {
            Object ret1 = PropertyUtils.getProperty(o1, this.attribute);
            Object ret2 = PropertyUtils.getProperty(o2, this.attribute);

            return this.comp.compare(ret1, ret2);
        } catch(Exception e) {
            return 0;
        }
    }
 }