SessionScoped Bean loses data on post-back on Google Appengine - google-app-engine

Question

I use Eclipse 3.7 GAE pluggin for development. My application uses JSF and datastore, and was set up as per https://sites.google.com/a/wildstartech.com/adventures-in-java/Java-Platform-Enterprise-Edition/JavaServer-Faces/javaserver-faces-20/configuring-javaserver-faces-20-to-run-on-the-google-appengine. In my development system, it works well. But when deployed to GAE, the SessionScoped Bean loses data on post-back:
// Input facelet
<h:outputLabel for="popupCal">Date </h:outputLabel>
<p:calendar value="#{editEntry.current.date1}" id="popupCal" />
<h:outputLabel for="code">Code </h:outputLabel>
<h:inputText id="code" value="#{editEntry.current.accountCode}"/>
<h:outputLabel for="amt">Amount </h:outputLabel>
<h:inputText id="amt" value="#{editEntry.current.amountInDollars}"/>
<h:commandButton action="#{editEntry.createCashExpenditure}" value="Create Entry"/>
#ManagedBean(name="editEntry")
#SessionScoped
public class EditEntry extends AbstractEntryBean implements Serializable {
#ManagedProperty(value="#{sessionBean}")
protected SessionBean sessionBean;
#ManagedProperty(value="#{dao}")
protected Dao dao;
#PostConstruct
public void init() {
Logger.getLogger(getClass().getName()).log(Level.WARNING, "dao is null? {0}", dao==null);
setTran_id(0L);
entries.clear();
setCurrent(new Entry());
getCurrent().clear();
...
this.refreshEntries();
}
public void refreshEntries() {
entries = dao.getEntries(current.getFinyr(), getTran_id());
Logger.getLogger(getClass().getName()).log(Level.INFO, "entries has {0} items", entries.size());
}
public String createCashExpenditure() {
if (dao == null) {
Logger.getLogger(getClass().getName()).log(Level.WARNING, "dao is null");
return null;
}
entries.clear();
Entry e = new Entry();
e.clear();
e.setAccountCode(current.getAccountCode());
e.setAccountName(dao.lookupAccoutName(e.getAccountCode()));
e.setAmount(current.getAmount());
e.setDate1(current.getDate1());
e.setTran_id(getTran_id());
Key key = dao.saveEntry(e, sessionBean.getFinyr());
e.setId(key.getId());
entries.add(e);
current = e;
this.setTran_id(e.getTran_id());
Logger.getLogger(getClass().getName()).log(Level.INFO, "current account is: {0}", current.getAccountCode());
return "newEntry?faces-redirect=true";
}
...
}
newEntry.xhtml
<p:dataTable id="items" value="#{editEntry.entries}" var="item">
// editEntry.entries is EMPTY!
When EditEntry.createCashExpenditure() is invoked, the log shows EditEntry.current is correctly populated, and saved to the datastore. Datastore viewer also displays the data. But on post-back, in newEntry.xhtml facelet, editEntry.entries becomes empty, EditEntry.current loses all data.
I have put in place ForceSessionSerializationPhaseListener as mentioned in http://java.zacheusz.eu/google-app-engine-http-session-vs-jsf-en/394/ The log shows this listener is invoked.
In web.xml, javax.faces.PROJECT_STAGE is Production,

Answer 1

I face the same issues, after redirect, previous session is gone. It only happen when deploy online.
I think that is due to session variable set to 'client' for javax.faces.STATE_SAVING_METHOD (in web.xml)
so before redirect, I need explicit set the session as below:
getSessionScope().put(sessionname,sessionObj);
public Map getSessionScope() {
return getFacesContext().getExternalContext().getSessionMap();
}