public String getLink1()
        {
                ListObject lObject= (ListObject)getCurrentRowObject();
                int lIndex= getListIndex();
                return "<a href=\"details.jsp?index=" + lIndex + "\">" + lObject.getId() + "</a>";
        }

<display:table name="sessionScope.details" decorator="org.displaytag.sample.Wrapper" >
  <display:column property="link1" title="ID" />
  <display:column property="email" />
</display:table>

public class TimeModel {

   public static final int DEFAULT_PERIOD = 60;

   private Timer timer;
   private boolean running;

   private int period;
   private int seconds;

   private PropertyChangeSupport propSupport;

   /**
    * Getters and setters for model properties.
    */

   /**
    * Returns the number of counted seconds.
    *
    * @return the number of counted seconds.
    */
   public int getSeconds() {
      return seconds;
   }

   /**
    * Sets the number of counted seconds. propSupport is an instance of PropertyChangeSupport
    * used to dispatch model state change events.
    *
    * @param seconds the number of counted seconds.
    */
   public void setSeconds(int seconds) {
      propSupport.firePropertyChange("seconds",this.seconds,seconds);
      this.seconds = seconds;
   }

   /**
    * Sets the period that the timer will count. propSupport is an instance of PropertyChangeSupport
    * used to dispatch model state change events.
    *
    * @param period the period that the timer will count.
    */
   public void setPeriod(Integer period){
      propSupport.firePropertyChange("period",this.period,period);
      this.period = period;
   }

   /**
    * Returns the period that the timer will count.
    *
    * @return the period that the timer will count.
    */
   public int getPeriod() {
      return period;
   }

   /**
    * Decides if the timer must restart, depending on the user answer. This method
    * is invoked by the controller once the view has been notified that the timer has
    * counted all the seconds defined in the period.
    *
    * @param answer the user answer.
    */
   public void questionAnswer(boolean answer){
      if (answer) {
         timer = new Timer();
         timer.schedule(new SecondsTask(this),1000,1000);
         running = true;
      }
   }

   /**
    * Starts/stop the timer. This method is invoked by the controller on user input.
    */
   public void setTimer(){
      if (running) {
         timer.cancel();
         timer.purge();
      }
      else {
         setSeconds(0);
         timer = new Timer();
         timer.schedule(new SecondsTask(this),1000,1000);
      }

      running = !running;
   }

   /**
    * The task that counts the seconds.
    */
   private class SecondsTask extends TimerTask {

      /**
       * We're not interested in the implementation so I omit it.
       */

   }
}

public interface TimeController {

   /**
    * Action invoked when the user wants to start/stop the timer
    */
   void userStartStopTimer();

   /**
    * Action invoked when the user wants to restart the timer
    */
   void userRestartTimer();

   /**
    * Action invoked when the user wants to modify the timer period
    *
    * @param newPeriod the new period
    */
   void userModifyPeriod(Integer newPeriod);
}

/**
    * Updates the GUI seconds fields
    */
   public void setScnFld(Integer sec){
      // scnFld is a Swing text field
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            scnFld.setText(sec.toString());
         }
      });
   }

@Retention(RetentionPolicy.RUNTIME) 
@Target(ElementType.METHOD) 
public @interface ModelDependent {

   String modelKey() default "";

   String propertyKey() default "";

   boolean runtimeModel() default false;

   boolean runtimeProperty() default false;

}

/**
    * Updates the GUI seconds fields
    */
   @ModelDependent(modelKey = "timeModel", propertyKey = "seconds")
   public void setScnFld(final Integer sec){
      // scnFld is a Swing text field
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            scnFld.setText(sec.toString());
         }
      });
   }

@ModelDependent(modelKey = "timeModel", propertyKey = "seconds")
   public void setScnFld(final Integer sec){
      Display.getDefault().asyncExec(new Runnable() {
         public void run() {
            secondsField.setText(sec.toString());
         }
      });
   }

// This method is invoked to display all the messages of one news channel
   @ModelDependent(modelKey = "dynamicChannel", propertyKey = "allmessages" , runtimeModel = true)
   public void setAllMessages(java.util.List messages) {
      // Updates the user interface
   }

   public String getDynamicChannel() {
      // Returns the channel requested by the user
   }