我遇到了将RF 3.3.3 DataTable迁移到RF 4.3.3-Final的问题，我使用rich：dataScroller进行服务器端分页，其中scrollListener属性触发backingbean方法来获取下一批结果。
到目前为止，我已更新了rich：dataScroller和scrollListener名称以匹配RF4规范
<rich:dataScroller page="#{viewSignatures.signaturesTable.currentPage}"
scrollListener="#{viewSignatures.actionOnPageChange}" maxPages="5"
fastControls="show" stepControls="hide" renderIfSinglePage="false">
</rich:dataScroller>
然后在action方法中添加了DataScrollEvent参数（不确定这是否有必要？）
@Override
public void actionOnPageChange(DataScrollEvent event) {
String val = event.getNewScrolVal();
log.info(val);
return val;
}
当我更改页面时，我得到以下异常：
17:32:59,158 ERROR [org.jboss.seam.exception.Exceptions] (ajp-localhost/127.0.0.1:8009-9) handled and logged exception: javax.servlet.ServletException
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:606) [jboss-jsf-api_2.1_spec-2.1.18.Final.jar:2.1.18.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:73) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) [jboss-seam.jar:2.3.1.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.modcluster.container.jbossweb.JBossWebContext$RequestListenerValve.event(JBossWebContext.java:67)
at org.jboss.modcluster.container.jbossweb.JBossWebContext$RequestListenerValve.invoke(JBossWebContext.java:48)
at org.jboss.as.web.session.ClusteredSessionValve.handleRequest(ClusteredSessionValve.java:134) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.web.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:99) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.web.session.JvmRouteValve.invoke(JvmRouteValve.java:92) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.web.session.LockingValve.invoke(LockingValve.java:64) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:488) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:420) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:920) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at java.lang.Thread.run(Thread.java:695) [classes.jar:1.6.0_65]
Caused by: java.lang.NullPointerException
at org.richfaces.taglib.MethodExpressionScrollListener.processDataScroll(MethodExpressionScrollListener.java:27) [richfaces-components-ui-4.3.3.Final.jar:4.3.3.Final]
at org.richfaces.event.DataScrollEvent.processListener(DataScrollEvent.java:83) [richfaces-components-api-4.3.3.Final.jar:4.3.3.Final]
at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:775) [jboss-jsf-api_2.1_spec-2.1.18.Final.jar:2.1.18.Final]
at org.richfaces.component.AbstractDataScroller.broadcast(AbstractDataScroller.java:206) [richfaces-components-ui-4.3.3.Final.jar:4.3.3.Final]
at org.richfaces.component.RowKeyContextEventWrapper.broadcast(RowKeyContextEventWrapper.java:104) [richfaces-components-ui-4.3.3.Final.jar:4.3.3.Final]
at org.richfaces.component.UIDataAdaptor.broadcast(UIDataAdaptor.java:448) [richfaces-components-ui-4.3.3.Final.jar:4.3.3.Final]
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:786) [jboss-jsf-api_2.1_spec-2.1.18.Final.jar:2.1.18.Final]
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1251) [jboss-jsf-api_2.1_spec-2.1.18.Final.jar:2.1.18.Final]
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81) [jsf-impl-2.1.18-jbossorg-1.jar:]
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) [jsf-impl-2.1.18-jbossorg-1.jar:]
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) [jsf-impl-2.1.18-jbossorg-1.jar:]
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593) [jboss-jsf-api_2.1_spec-2.1.18.Final.jar:2.1.18.Final]
... 32 more
17:32:59,207 ERROR [org.jboss.seam.exception.Exceptions] (ajp-localhost/127.0.0.1:8009-9) handled and logged exception: java.lang.NullPointerException: Argument Error: Parameter message is null
at com.sun.faces.util.Util.notNull(Util.java:299) [jsf-impl-2.1.18-jbossorg-1.jar:]
at com.sun.faces.context.FacesContextImpl.addMessage(FacesContextImpl.java:492) [jsf-impl-2.1.18-jbossorg-1.jar:]
at org.jboss.seam.faces.FacesMessages.beforeRenderResponse(FacesMessages.java:45) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.jsf.SeamPhaseListener.beforeRenderResponse(SeamPhaseListener.java:488) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.jsf.SeamPhaseListener.beforeServletPhase(SeamPhaseListener.java:147) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.jsf.SeamPhaseListener.beforePhase(SeamPhaseListener.java:117) [jboss-seam.jar:2.3.1.Final]
at com.sun.faces.lifecycle.Phase.handleBeforePhase(Phase.java:228) [jsf-impl-2.1.18-jbossorg-1.jar:]
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:99) [jsf-impl-2.1.18-jbossorg-1.jar:]
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139) [jsf-impl-2.1.18-jbossorg-1.jar:]
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594) [jboss-jsf-api_2.1_spec-2.1.18.Final.jar:2.1.18.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:73) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) [jboss-seam.jar:2.3.1.Final]
at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158) [jboss-seam.jar:2.3.1.Final]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.modcluster.container.jbossweb.JBossWebContext$RequestListenerValve.event(JBossWebContext.java:67)
at org.jboss.modcluster.container.jbossweb.JBossWebContext$RequestListenerValve.invoke(JBossWebContext.java:48)
at org.jboss.as.web.session.ClusteredSessionValve.handleRequest(ClusteredSessionValve.java:134) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.web.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:99) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.web.session.JvmRouteValve.invoke(JvmRouteValve.java:92) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.web.session.LockingValve.invoke(LockingValve.java:64) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50) [jboss-as-jpa-7.2.0.Final.jar:7.2.0.Final]
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:169) [jboss-as-web-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:488) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:420) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:920) [jbossweb-7.2.0.Final.jar:7.2.0.Final]
at java.lang.Thread.run(Thread.java:695) [classes.jar:1.6.0_65]
'NullPointerException：Argument Error：Parameter message is null'异常的一部分然后重复20-30次，导致重定向循环
答案 0 :(得分：0)
事实证明，由于之前的解决方法，我已禁用部分状态保存，因此可以解决问题
javax.faces.PARTIAL_STATE_SAVING 真正