sorry for the delay in replying i was very busy
as a simple example there is a generic Dao class to return the results
of a namedquery
@Stateless
public class DAO {
@PersistenceContext(unitName = "widgetDataSource")
private EntityManager em;
....
@SuppressWarnings("unchecked")
public <E> List<E> namedFind(Class<E> clazz, String query) {
return em.createNamedQuery(query, clazz).getResultList();
}
....
}
call the namedFind from another stateless
@Stateless
public class WidgetDAO {
@EJB
private DAO dao;
...
public List<Widget> findAll() {
return dao.namedFind(Widget.class, "Widget.findAll");
}
....
}
this is loaded into a managedbean
@ManagedBean
@ViewScoped
public class WidgetBean {
@EJB
private WidgetDAO widgetDao;
private List<Widget> widgetList;
public void onload(){
setWigdetList(widgetDao.fildAll());
}
...setter getter of widgetList
}
which is supposed to display in jsf
<?xml version="1.0" encoding="UTF-8"?>
<ui:composition xmlns="http://www.w3.org/1999/xhtml";
xmlns:h="http://java.sun.com/jsf/html";
xmlns:ui="http://java.sun.com/jsf/facelets";
xmlns:f="http://java.sun.com/jsf/core";
template="/WEB-INF/include/layout.xhtml">
...
<ui:repeat var="widget" value="#{widgetBean.widgetList}">
<ui:repeat var="subWidget" value="#{widget.subWidgets}">
...where are the sub widgets?
</ui:repeat>
</ui:repeat>
</ui:composition>
Like i say if i loop through the widgets (or maybe the subwidgets as
well) it then loads in the JSF. so it lazy loads in java but not in
JSF. should i change to eager when i generate the entities or is there
something else i can do? is it supposed to work the same as eclipselink?
On 02/11/2016 08:06, Mark Struberg wrote:
Hi Matthew!
Now I'm back on my notebook.
What transaction mechanism are you using? JTA or ResourceLocal?
And what technology to control the transactions? EJBs? CDI? Spring?
It boils down to be more a question about appliction architecture than about
OpenJPA, but still very important to cover. So just go ahead, I'm pretty sure
we can help you.
LieGrue,
strub
Am 24.10.2016 um 10:34 schrieb Matthew Broadhead
<matthew.broadh...@nbmlaw.co.uk>:
HI, I am using TomEE 7.0.1 and I just switched from Plume to Plus. I was using
eclipselink and now I am converting to OpenJPA. When I fetch a set of entities
and then try to iterate through their associations in JSF the list is empty.
in eclipselink they were populated by default. if i loop through the entities
in Java before displaying in JSF then they are populated (i guess they get lazy
loaded). is there a setting that needs to be changed? like generating with
all associations as eager or setting a flag in persistence.xml? what would
give the same default as eclipselink? seemed like an easy question but i could
not find anything by searching.
