JSF2 GAE和ViewScoped ManagedBean [英] JSF2 with GAE and ViewScoped ManagedBean
问题描述
我设法通过 tutorial 。现在我有一个奇怪的行为与ViewScoped ManagedBean：
@ManagedBean @ViewScoped
public class TestBean implements Serializable
{
私人字符串文本; // getter / setter
private List< String>文本; // getter
@PostConstruct public void init（）
{
texts = new ArrayList< String>（）;
texts.add（Test）;
text = new String（）;
}
public void save（ActionEvent ae）
{
texts.add（text）;
text = new String（）;
}
}
这是我的.xhtml页面：
< h：body id =body>
< f：view contentType =text / html>
< h：form id =frm>
< p：面板>
< h：panelGrid columns =2id =grid>
< p：inputText value =＃{testBean.text}/>
< / h：panelGrid>
< / p：面板>
< p：outputPanel id =op>
< p：dataTable var =vvalue =＃{testBean.texts}>
< h：outputText value =＃{v}/>< / p：列>
< / p：dataTable>
< / p：outputPanel>
< / h：表格>
< / f：view>
< / h：body>
这适用于本地部署（使用GAE的Eclipse工具），但如果我部署到GAE，如果我点击添加 - 按钮，什么都不会发生。点击添加后，范围（在GAE）的附加测试显示以下内容：
@RequestScoped ：输入文本不会消失，不会添加到dataTable中
@ViewScoped ：输入文本不会消失，不会添加到dataTable中。
@SessionScoped ：输入文本消失，dataTable始终有两个条目：Test和最后输入的文本
我从教程中获得了相同的设置
<的context-param> //web.xml
< param-name> javax.faces.STATE_SAVING_METHOD< / param-name>
< param-value>服务器< /参数值>
< / context-param>
//appengine-web.xml
<会话启用>真实< /会话启用>
更新1
以下是使用 @ManagedBean @ViewScoped 注释进行额外测试的结果：
在第一次请求或手动刷新页面），调用 @PostConstruct init（）方法。如果我点击按钮什么都没有发生，那么对 test.jsf 的请求会记录在应用程序引擎日志中，但是我的 save（）方法。 Firebug向我展示了一个POST请求到 test.jsf 和以下答案：
<？xml version ='1.0'encoding ='UTF-8'？>
<部分响应><错误>
< error-name>类javax.faces.application.ViewExpiredException< / error-name>
<错误讯息>
<！[CDATA [viewId：/test.jsf - View /test.jsf无法恢复。]]>
< / error-message>
< / error>
< extension primefacesCallbackParam =validationFailed>
{validationFailed：false}
< / extension>
< / partial-response>
更新2
我已经使用mojarra-2.0.4，但现在更新到2.0.6。同样的问题，但一个新的观察：如果我清除所有的Firefox缓存， ViewExpiredException 没有出现，但我只能将1个元素添加到列表与LT;字符串> 。 @PostConstruct 只会被调用一次，而不是每次点击按钮。
从servlet未捕获的异常
java.lang.NoClassDefFoundError：无法初始化类
com.google.apphosting.runtime.security.shared.stub.javax.naming.InitialContext
我不确定是否应该尝试让我的表单工作，因为google在他们的教程中明确提到了mojarra（2.0.4）。
$ b
strong>
- GAE上的ViewExpiredException
- JIRA JAVASERVERFACES-1886 通常我不会不回答我的问题，我只评价此答案作为解决方法而不是正确答案。事件如果我不喜欢客户状态保存，这似乎解决了奇怪的行为。但我必须详细检查：
< context-param>
< param-name> javax.faces.STATE_SAVING_METHOD< / param-name>
< param-value>客户端< /参数值>
< / context-param>
也许我们应该等到 JAVASERVERFACES-1886 已解决。
I managed to get a prototype with JSF2 get working at Googles AppEngine following this tutorial. Now I have some odd behavior with a ViewScoped ManagedBean:
@ManagedBean @ViewScoped
public class TestBean implements Serializable
{
private String text; //getter/setter
private List<String> texts; //getter
@PostConstruct public void init()
{
texts = new ArrayList<String>();
texts.add("Test");
text = new String();
}
public void save(ActionEvent ae)
{
texts.add(text);
text = new String();
}
}
This is my .xhtml page:
<h:body id="body">
<f:view contentType="text/html">
<h:form id="frm">
<p:panel>
<h:panelGrid columns="2" id="grid">
<p:inputText value="#{testBean.text}"/>
<p:commandButton value="Add" update=":frm:op @parent"
actionListener="#{testBean.save}" />
</h:panelGrid>
</p:panel>
<p:outputPanel id="op">
<p:dataTable var="v" value="#{testBean.texts}">
<p:column><h:outputText value="#{v}" /></p:column>
</p:dataTable>
</p:outputPanel>
</h:form>
</f:view>
</h:body>
This works fine with a local deployment (Using the Eclipse tools for GAE), but if I deploy this to GAE, nothing happens if I click on the Add-Button. Additional Tests with the scope (at GAE) show the following after clicking on Add:
@RequestScoped: Entered Text does not disappear, not added to dataTable@ViewScoped: Entered Text does not disappear, not added to dataTable@SessionScoped: Entered Text disappear, dataTable always has two entries: "Test" and the last entered Text
I have the same setting from the tutorial
<context-param> //web.xml
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>server</param-value>
</context-param>
//appengine-web.xml
<sessions-enabled>true</sessions-enabled>
Update 1
Here are the results of additional tests with @ManagedBean @ViewScoped annotation:
During the first request (or manual refreh of the page), the @PostConstruct init() method is called. If I click on the button nothing happes, the request to test.jsf is logged in app engines log, but there is no log in my save() method. Firebug shows me a POST request to test.jsf and the following answer:
<?xml version='1.0' encoding='UTF-8'?>
<partial-response><error>
<error-name>class javax.faces.application.ViewExpiredException</error-name>
<error-message>
<![CDATA[viewId:/test.jsf - View /test.jsf could not be restored.]]>
</error-message>
</error>
<extension primefacesCallbackParam="validationFailed">
{"validationFailed":false}
</extension>
</partial-response>
Update 2
I have used mojarra-2.0.4 but now updated to 2.0.6. The same issue, but a new observation: If I clear all Firefox caches, the ViewExpiredException did not appear, but I'm only able to add 1 Element to the List<String>. The @PostConstruct is only invoked once and not for each click on the button.
Then I tried myfaces-2.0.7, but got this exception:
Uncaught exception from servlet
java.lang.NoClassDefFoundError: Could not initialize class
com.google.apphosting.runtime.security.shared.stub.javax.naming.InitialContext
I'm not sure if I should try to get myfaces working since google explicitly mentions mojarra (2.0.4) in their tutorial.
References
Normally I don't answer my questions and I only rate this answer as a workaround and not as the correct answer. Event if I don't like client state saving, this seems to fix the odd behavior. But I have to check this in detail:
<context-param>
<param-name>javax.faces.STATE_SAVING_METHOD</param-name>
<param-value>client</param-value>
</context-param>
Perhaps we should wait until JAVASERVERFACES-1886 is resolved.
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