OC4J Initialisation

Question

We have an application that needs to cache a lot of objects in memory before we allow clients to access the server. Currently this is performed by sending a start command to the server and rejecting all requests until the cache load is incomplete.
I have a cople of questions to see whether we can improve on this.
1. Is it possible to autostart a load within OC4J when the OC4J process is started and if so how?
2. Is it possible to configure the load balancing software such that no requests are sent to the booting server until the cache load is complete and if so how?
Cheers,
Andy.

Answer 1

i know your problem for the first question. My solution is to implements a timer in your application server. every day or every hour the procedure is call and refreh your data. The most simple is to have in your web.xml an entry like this
<listener>
<listener-class>com.<your package>.ListenerStart</listener-class>
</listener>
who ListenerStart is the name of a class
In your default-web-site.xml you application entry like this
<web-app application="name" load-on-startup="true" name="nameweb" root="/name" />
When the server start automaticaly your ListenerStart is loaded.
In this ListenerStart.java you have this example:
package com.....;
import javax.servlet.*;
import java.util.*;
public final class LcbContext implements ServletContextListener {
public Reminder schedule = null;
//Diclenchement des diffirents Timer de mise ` jour automatique des bases
schedule = new Reminder();
schedule.RemindAction();
Your class Reminder like this
package com...;
import java.util.Timer;
import java.util.Calendar;
import java.util.Date;
public class Reminder {
private Timer timeract;
private Calendar calendarmess;
private Date timemess;
public void StopReminder(){
timeract.cancel();
public Reminder() {
timeract = new Timer();
public void RemindAction(){
calendarmess = Calendar.getInstance();
calendarmess.set(Calendar.HOUR_OF_DAY, Integer.parseInt(_xmlSin.get().getValue(fichierXML,tag,"heure")));
calendarmess.set(Calendar.MINUTE, Integer.parseInt(_xmlSin.get().getValue(fichierXML,tag,"minute")));
calendarmess.set(Calendar.SECOND, 0);
timemess = calendarmess.getTime();
timermess = new Timer();
timermess.schedule(new RemindTaskAction(calendarmess),timemess);
RemindTaskAction.class like this:
package com...;
import java.util.TimerTask;
import java.util.Calendar;
public class RemindTaskMessage extends TimerTask {
private BatchLancementDAO _batchdao;
private Calendar _calendarmess;
public RemindTaskMessage(Calendar calendarmess ){
_calendarmess = calendarmess;
public void run() {
boolean timerRun = true;
if (timerRun){
System.out.println("##Debut de mise a jour base.##");
System.out.println(_calendarmess.getTime()+" Lancement du batch .");
try{
this.setLimiteAction();
}catch(Exception e){
e.printStackTrace();
System.out.println("## WARNING :Probleme de mise a jour des messages.##");
System.out.println("##Fin de mise a jour des messages.##");
public void setLimiteAction() throws Exception{
_batchdao.get().setLimiteMessage();
// or implementation of your sql who find the data and store them in cache