JSF - 无法将 SessionScopedBean 设置为 ViewScopedBean答案

【问题标题】：JSF - Unable to set SessionScopedBean to a ViewScopedBeanJSF - 无法将 SessionScopedBean 设置为 ViewScopedBean
【发布时间】：2016-08-20 20:28:22
【问题描述】：

我使用 JSF 2.2.12、Prime Faces 6.0、Omnifaces 2.4 和 Glassfish 4.1.1 开发了一个 Java Web 应用程序。

如果用户没有会话并尝试通过与主页不同的页面访问网站，则会显示此错误

无法为托管 bean ContactController 设置属性 SessionScopedBean ... ... 原因：java.lang.IllegalStateException：响应提交后无法创建会话

我看到了一些关于“提交响应后无法创建会话”的其他问题，并且看到了一些“解决方案”。

目前最“有效”的是这个答案https://stackoverflow.com/a/9687525/3564882。是的，错误消失了，但缺点是用户被重定向到主页。对我来说不清楚这里发生了什么。

这里有一些代码，但所有的 bean 都没有做任何特别的事情

联系人控制器

@ManagedBean
@ViewScoped
public class ContactController implements Serializable {

@ManagedProperty(value = "#{sessionScopedBean}")
private SessionScopedBean sessionScopedBean;

public void loadThePage() {
    UserInSessionBean userInSessionBean = sessionScopedBean.getUserInSessionBean();
    if (userInSessionBean != null) {
        ...
    }
}

SessionScopedBean

@ManagedBean(name = "sessionScopedBean")
@SessionScoped
public class SessionScopedBean implements Serializable{
   private UserInSessionBean userInSessionBean;
   ...
   ...
   public UserInSessionBean getUserInSessionBean() {
        return userInSessionBean;
   }

   public void setUserInSessionBean(UserInSessionBean userInSessionBean) {
        this.userInSessionBean = userInSessionBean;
   }
}

所以基本上问题发生在我的用户没有会话并尝试访问与主页不同的页面时。在所有其他情况下，我没有任何问题。

这里是完整的堆栈跟踪

Warning:   Unable to set property sessionScopedBean for managed bean contactController
com.sun.faces.mgbean.ManagedBeanCreationException: Unable to set property sessionScopedBean for managed bean contactController
    at com.sun.faces.mgbean.ManagedBeanBuilder$BakedBeanProperty.set(ManagedBeanBuilder.java:615)
    at com.sun.faces.mgbean.ManagedBeanBuilder.buildBean(ManagedBeanBuilder.java:133)
    at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:102)
    at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
    at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:257)
    at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:117)
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
    at com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:116)
    at com.sun.el.parser.AstValue.getBase(AstValue.java:151)
    at com.sun.el.parser.AstValue.getTarget(AstValue.java:170)
    at com.sun.el.parser.AstValue.invoke(AstValue.java:272)
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:304)
    at org.jboss.weld.util.el.ForwardingMethodExpression.invoke(ForwardingMethodExpression.java:40)
    at org.jboss.weld.el.WeldMethodExpression.invoke(WeldMethodExpression.java:50)
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:87)
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
    at javax.faces.component.UIViewAction.broadcast(UIViewAction.java:562)
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:790)
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1282)
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:198)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:658)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:344)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at org.glassfish.tyrus.servlet.TyrusServletFilter.doFilter(TyrusServletFilter.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at com.myApp.jsf.filter.SecurityWebFilter.doFilter(SecurityWebFilter.java:42)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at com.classicvirus.jsf.filter.LoggedUserWebFilter.doFilter(LoggedUserWebFilter.java:55)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at org.apache.logging.log4j.web.Log4jServletFilter.doFilter(Log4jServletFilter.java:71)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:316)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:416)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:283)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:283)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:200)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:132)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:111)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:536)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
    at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.IllegalStateException: Cannot create a session after the response has been committed
    at org.apache.catalina.connector.Request.doGetSession(Request.java:3241)
    at org.apache.catalina.connector.Request.getSession(Request.java:2884)
    at org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:908)
    at com.sun.faces.context.ExternalContextImpl.getSession(ExternalContextImpl.java:167)
    at javax.faces.context.ExternalContextWrapper.getSession(ExternalContextWrapper.java:438)
    at com.sun.faces.mgbean.BeanManager$ScopeManager$SessionScopeHandler.handle(BeanManager.java:578)
    at com.sun.faces.mgbean.BeanManager$ScopeManager.pushToScope(BeanManager.java:458)
    at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:410)
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
    at com.sun.faces.el.ManagedBeanELResolver.resolveBean(ManagedBeanELResolver.java:257)
    at com.sun.faces.el.ManagedBeanELResolver.getValue(ManagedBeanELResolver.java:117)
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
    at com.sun.el.parser.AstIdentifier.getValue(AstIdentifier.java:116)
    at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:226)
    at org.jboss.weld.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
    at com.sun.faces.mgbean.BeanBuilder$Expression.evaluate(BeanBuilder.java:561)
    at com.sun.faces.mgbean.ManagedBeanBuilder$BakedBeanProperty.set(ManagedBeanBuilder.java:606)
    ... 67 more

你能帮帮我吗？

【问题讨论】：

标签： jsf glassfish

【解决方案1】：

经过一番调查，我意识到这是我的错误和（可能）一个 JSF 错误之间的混合。

关于以下

At the moment the most "effective" is this answer http://stackoverflow.com/a/9687525/3564882. Yes, the error disappears, but the drawback is that the user is redirected to the home page. For me is not clear what's happening here.

是我的错，因为在过去的 @PostConstruct 方法中，我将用户重定向到主页。在我的理想情况下，新代码会产生错误。

但我不清楚为什么我们需要在需要时创建会话。有时 JSF 需要它。有时不是。出于这个原因，我认为这是 JSF 内部的一个小错误。

只是回顾一下。解决方法是放置这条线

FacesContext.getCurrentInstance().getExternalContext().getSession(true);

在所有控制器中（我有一个帮助我的超类）。

在此之后，请记住创建“sessionScopedBean”，认为问题中解释的案例存在。这样可以避免浪费几个小时。

【讨论】：