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,并按照https://sites.google.com/a/wildstartech.com/adventures-in-java/Java-Platform-Enterprise-Edition/JavaServer-Faces/javaserver-faces进行设置-20/configuring-javaserver-faces-20-to-run-on-the-google-appengine。在我的开发系统中,它运行良好。但是当部署到 GAE 时,SessionScoped Bean 在回发时会丢失数据:
// 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!
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。数据存储查看器也显示数据。但是在回发时,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/中提到的那样设置了 ForceSessionSerializationPhaseListener 日志显示此侦听器已被调用。
在 web.xml 中,javax.faces.PROJECT_STAGE 是 Production,