我正在尝试将一些会话范围的 bean 转换为会话范围。当我尝试从我的页面访问其中一个 bean 中的方法时menu.xhtml，我收到以下错误：
javax.servlet.ServletException: /menu.xhtml @23,94 actionListener="#{report.reset()}": JBWEB006003: Cannot convert conversation of type class java.lang.String to interface java.util.Map
这是堆栈跟踪：
12:49:16,720 SEVERE [javax.enterprise.resource.webcontainer.jsf.context] (http-/0.0.0.0:8080-2) JSF1073: javax.faces.event.AbortProcessingException caught during processing of APPLY_REQUEST_VALUES 2 : UIComponent-ClientId=myForm:menuItemLink2, Message=/menu.xhtml @23,94 actionListener="#{report.reset()}": JBWEB006003: Cannot convert conversation of type class java.lang.String to interface java.util.Map
12:49:16,730 SEVERE [javax.enterprise.resource.webcontainer.jsf.context] (http-/0.0.0.0:8080-2) /menu.xhtml @23,94 actionListener="#{report.reset()}": JBWEB006003: Cannot convert conversation of type class java.lang.String to interface java.util.Map: javax.faces.event.AbortProcessingException: /menu.xhtml @23,94 actionListener="#{report.reset()}": JBWEB006003: Cannot convert conversation of type class java.lang.String to interface java.util.Map
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:182) [jboss-jsf-api_2.1_spec-2.1.28.Final-redhat-1.jar:2.1.28.Final-redhat-1]
at javax.faces.event.ActionEvent.processListener(ActionEvent.java:88) [jboss-jsf-api_2.1_spec-2.1.28.Final-redhat-1.jar:2.1.28.Final-redhat-1]
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:771) [jboss-jsf-api_2.1_spec-2.1.28.Final-redhat-1.jar:2.1.28.Final-redhat-1]
at javax.faces.component.UICommand.broadcast(UICommand.java:300) [jboss-jsf-api_2.1_spec-2.1.28.Final-redhat-1.jar:2.1.28.Final-redhat-1]
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:786) [jboss-jsf-api_2.1_spec-2.1.28.Final-redhat-1.jar:2.1.28.Final-redhat-1]
at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:927) [jboss-jsf-api_2.1_spec-2.1.28.Final-redhat-1.jar:2.1.28.Final-redhat-1]
at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78) [jsf-impl-2.1.28.redhat-8.jar:2.1.28.redhat-8]
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.1.28.redhat-8.jar:2.1.28.redhat-8]
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) [jsf-impl-2.1.28.redhat-8.jar:2.1.28.redhat-8]
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) [jboss-jsf-api_2.1_spec-2.1.28.Final-redhat-1.jar:2.1.28.Final-redhat-1]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at de.rainer_klute.jsf.UploadFilter.doFilter(UploadFilter.java:97) [FileUploader.jar:]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:231) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:512) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.5.0.Final-redhat-21.jar:7.5.0.Final-redhat-21]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:150) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:854) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:926) [jbossweb-7.5.7.Final-redhat-1.jar:7.5.7.Final-redhat-1]
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_60]
Caused by: javax.el.ELException: /menu.xhtml @23,94 actionListener="#{report.reset()}": JBWEB006003: Cannot convert conversation of type class java.lang.String to interface java.util.Map
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:111) [jsf-impl-2.1.28.redhat-8.jar:2.1.28.redhat-8]
at javax.faces.event.MethodExpressionActionListener.processAction(MethodExpressionActionListener.java:148) [jboss-jsf-api_2.1_spec-2.1.28.Final-redhat-1.jar:2.1.28.Final-redhat-1]
这是如何引起的，我该如何解决？