Youcef Laidani Youcef Laidani - 1 year ago 91
Java Question

Use EJB inside Singleton Startup to get information from database

I use

and i want to get some information from my database, to use them in the startup of my application i use this piece of code:

public class StartWhenDeploy {

private MyFacade myFacade;

private int info1 = myFacade.getInfo1();
private Date info2 = myFacade.getInfo2();


My facade

public class StartWhenDeploy {

private AdminUtilisateurFacade adminUtilisateurFacade;

private int PERIOD = adminUtilisateurFacade.getPeriode();
private Date StartDate = adminUtilisateurFacade.getStartDate();


Caused by: java.lang.NullPointerException
at dz.elit.tresor.commun.util.StartWhenDeploy.<init>(
at dz.elit.tresor.commun.util.__EJB31_Generated__StartWhenDeploy__Intf____Bean__.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

But this does not work with me, i know why it does not work, because the facades and entities are not yet instantiated, but i look for a solution to this problem.

So is there any other idea how i should get my information from
to use them in
Singleton Startup
, or this is not possible?

Thank you.

Answer Source

I suggest you add a a method annotated @PostContruct, for exemple call it initDataBase, this way it will called after the initialisation of the class :

public void initDataBase() {

inside of this method you can call any facade, for exemple :

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