我的h：commandButton“登录”有问题：当我使用@ViewScoped并按此按钮时，出现ViewExpiredException，但是当我使用@SessionScoped时，没有任何错误。
堆栈跟踪：
javax.faces.application.ViewExpiredException: /pages/register.xhtmlNo saved view state could be found for the view identifier: /pages/register.xhtml
at org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:132)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:170)
at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:45)
at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:45)
at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:45)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)
我的页面：
<h:form>
<h:panelGrid columns="2" >
<h:outputLabel value="Login:"/>
<h:inputText value="#{registerController.registerLog}"/>
<h:outputLabel value="#{msg.password}"/>
<h:inputSecret id="pass" value=""/>
<h:column/>
<h:commandButton value="Login" action="#{registerController.login}"/>
</h:panelGrid>
</h:form>
这是我的RegisterController类：
@ManagedBean
@ViewScoped
public class RegisterController {
private String registerLog = "";
private String registerPass = "";
/**
* Creates a new instance of RegisterController
*/
public RegisterController() {
}
//getters, setters
public String login(){
return null;
}
最佳答案
造成您的具体问题的原因是，您的视图范围Bean无法序列化，因此MyFaces无法将其保存在视图状态。默认情况下，MyFaces会序列化会话中的整个状态，而不是仅引用会话中的状态，并在必要时让容器对其进行序列化。
基本上有两种解决方案：
让您的视图作用域bean实现Serializable。
告诉MyFaces不要在会话中序列化整个视图状态。
<context-param>
<param-name>org.apache.myfaces.SERIALIZE_STATE_IN_SESSION</param-name>
<param-value>false</param-value>
</context-param>
请注意，无论何时重新启动服务器，视图作用域的bean仍将丢失。