JSF会话故障转移和部分状态保存

Question

在JSF 2.0.9，Weblogic
10.3.4上运行。我们现在在生产环境中运行JSF，但是会话复制遇到了一些问题并进行了故障转移。我们正在为我们的bean使用viewscope，我已经确保它们是可序列化的/瞬态的，并且瞬态变量实际上是无状态的。但是，会话故障转移不起作用。我已经进行了广泛的测试，并设法通过在web.xml中设置以下参数来使其正常工作

    <context-param>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>client</param-value>
    </context-param>


    <context-param>
        <param-name>javax.faces.PARTIAL_STATE_SAVING</param-name>
        <param-value>false</param-value>
    </context-param>

如果设置STATE_SAVING_METHOD为，则server在故障转移时会收到viewexpired异常。如果我设置为client同PARTIAL_STATE_SAVING来true我得到以下错误：

java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
    at java.util.ArrayList.RangeCheck(ArrayList.java:547)
    at java.util.ArrayList.get(ArrayList.java:322)
    at javax.faces.component.AttachedObjectListHolder.restoreState(AttachedObjectListHolder.java:165)
    at javax.faces.component.UIComponentBase.restoreState(UIComponentBase.java:1433)
    at com.sun.faces.application.view.StateManagementStrategyImpl$1.visit(StateManagementStrategyImpl.java:265)
    at com.sun.faces.component.visit.FullVisitContext.invokeVisitCallback(FullVisitContext.java:151)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1507)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1521)
    at com.sun.faces.component.visit.VisitUtils.doFullNonIteratingVisit(VisitUtils.java:75)
    at com.sun.faces.application.view.StateManagementStrategyImpl.restoreView(StateManagementStrategyImpl.java:282)
    at com.sun.faces.application.StateManagerImpl.restoreView(StateManagerImpl.java:181)
    at com.sun.faces.application.view.ViewHandlingStrategy.restoreView(ViewHandlingStrategy.java:123)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:448)
    at com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:148)
    at com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:187)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.RestoreViewPhase.doPhase(RestoreViewPhase.java:111)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:508)
    at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
    at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
    at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)
    at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:27)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
    at weblogic.servlet.internal.RequestEventsFilter.doFilter(RequestEventsFilter.java:27)
    at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:57)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3730)
    at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696)
    at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
    at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
    at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2273)
    at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
    at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)

所以我的问题是：

• 是STATE_SAVING_METHOD- client＆PARTIAL_STATE_SAVING- false我要进行故障转移的唯一方法吗？
• 客户/错误组合的成本是多少？此内存/ CPU是否扩展？
• 这是一个错误吗？如果是，那么可以在2.1或2.2中解决吗？

提前致谢。

Answer 1

我终于可以正常工作了，但并非没有多余的东西。首先，我在web.xml中添加了以下内容（是的，拼写错误）：

    <context-param>
        <param-name>com.sun.faces.enableAgressiveSessionDirtying</param-name>
        <param-value>true</param-value>
    </context-param>

现在，客户端保存为服务器，部分状态保存仍为false（true根本不起作用）

其次，在实现HttpSessionAttributeListener之后，我发现com.sun.faces.renderkit.ServerSideStateHelper.LogicalViewMap在会话中保存状态的只会被添加一次，而不会再被删除/添加/替换。因此，尽管在本地会话中对其进行了更新，但这些更改从未复制到另一个jvm。Weblogic文档指出必须在会话属性上调用setAttribute才能使复制正常工作。为了解决这个问题，我创建了一个阶段侦听器，如下所示：

public class ViewPhaseListener implements PhaseListener {

    public void afterPhase(PhaseEvent phaseEvent)
    {

    }

    public void beforePhase(PhaseEvent phaseEvent)
    {
        HttpServletRequest request = ((HttpServletRequest) phaseEvent.getFacesContext().getExternalContext().getRequest());
        HttpSession session = request.getSession();

        session.setAttribute("com.sun.faces.renderkit.ServerSideStateHelper.LogicalViewMap", session.getAttribute("com.sun.faces.renderkit.ServerSideStateHelper.LogicalViewMap"));

    }

    public PhaseId getPhaseId()
    {
        return PhaseId.RENDER_RESPONSE;
          //To change body of implemented methods use File | Settings | File Templates.
    }
}

这只是在每个请求之后替换属性，并确保它可以复制。另外，我使用以下方法限制了视图中存储的数据：

<context-param>
        <param-name>com.sun.faces.numberOfViewsInSession</param-name>
        <param-value>3</param-value>
    </context-param>

    <context-param>
        <param-name>com.sun.faces.numberOfLogicalViews</param-name>
        <param-value>1</param-value>
    </context-param>

希望这对遇到相同问题的人有所帮助。