Question

我使用Eclipse 3.7 GAE插件进行开发。我的应用程序使用JSF和数据存储区，并按照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进行设置。在我的开发系统中，它运行良好。但是当部署到GAE时，SessionScoped Bean会在回发后丢失数据：

// 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!

当调用EditEntry.createCashExpenditure（）时，日志显示EditEntry.current已正确填充，并保存到数据存储区。数据存储区查看器还显示数据。但是在post-back上，在newEntry.xhtml facelet中，editEntry.entries变为空，EditEntry.current丢失所有数据。

我已经按照http://java.zacheusz.eu/google-app-engine-http-session-vs-jsf-en/394/中的提法设置了ForceSessionSerializationPhaseListener。日志显示了这个侦听器被调用。

在web.xml中，javax.faces.PROJECT_STAGE是Production，

Answer 1

我面临同样的问题，重定向后，前一个会话消失了。它只在部署在线时发生。

我认为这是因为javax.faces.STATE_SAVING_METHOD（在web.xml中）将会话变量设置为'client'

所以在重定向之前，我需要显式设置会话如下：

getSessionScope().put(sessionname,sessionObj);

public Map getSessionScope() {
  return getFacesContext().getExternalContext().getSessionMap();
}

SessionScoped Bean在Google Appengine上的回发丢失数据

1 个答案: