我通过 glassfish 服务器上的 netbeans 在 localhost 上启动我的 Web 应用程序。我在 rankMe.xhtml 页面上没有错误。在我的专用服务器上部署 .war 工作正常。但是当我尝试访问rankMe.xhtml带有 primefaces 订单列表的页面时，我遇到了 NPE 错误。我不明白。
java.lang.NullPointerException
at org.primefaces.component.orderlist.OrderListRenderer.encodeOptions(OrderListRenderer.java:150)
at org.primefaces.component.orderlist.OrderListRenderer.encodeList(OrderListRenderer.java:109)
at org.primefaces.component.orderlist.OrderListRenderer.encodeMarkup(OrderListRenderer.java:80)
at org.primefaces.component.orderlist.OrderListRenderer.encodeEnd(OrderListRenderer.java:50)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:924)
at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:63)
at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:47)
at org.primefaces.component.panel.PanelRenderer.encodeContent(PanelRenderer.java:202)
at org.primefaces.component.panel.PanelRenderer.encodeMarkup(PanelRenderer.java:119)
at org.primefaces.component.panel.PanelRenderer.encodeEnd(PanelRenderer.java:56)
at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:924)
at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:312)
at com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:115)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:894)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)
at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:894)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:443)
at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
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:357)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:260)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:188)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:191)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:168)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:189)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:288)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:206)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:136)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:114)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:838)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:113)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:115)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:55)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:135)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:564)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:544)
at java.lang.Thread.run(Thread.java:724)
我不认为我的 xhtml 页面的代码是必要的，但以防万一：
在 rankMe.xhtml 中：
<p:orderList value="#{waitingList.recupererWL()}" var="player" controlsLocation="none"
itemLabel="#{player}" itemValue="#{player}" id="basicList"/>
在 CDI bean waitingList 中：
@Named
@RequestScoped
public class WaitingList implements Serializable {
public WaitingList() {
}
public List<String> recupererWL() {
ArrayList<String> players = (ArrayList<String>) FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().get("players");
if (players == null) {
players = new ArrayList<String>();
FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().put("players", players);
}
return players;
}
谢谢阅读
编辑：我检查了它是否是好的 .war 部署。所以这不是这种问题
EDIT2：一般来说，当我在 localHost 上没有错误并且在专用服务器上没有错误时，我应该看什么/在哪里？
EDIT3：我还注意到其他东西不起作用。在我看来，CDI bean 不是创建的。