JSF 页面中出现带有 <f:websocket> 的错误“websocket is null”

Question

上下文：Jakarta EE 10，Payara 6.2024.7，网络配置文件。 Java 21.

我的应用程序使用 OpenAI API 和 LangChain4j 进行非“定制”聊天。

在网页中，表单将问题发送到 API 的 WebSocket 中，并在此 WebSocket 中接收 API 回答的令牌流。发送所有令牌后，服务器会发送消息“streamingfinished”，该消息会触发

<f:ajax>

中包含的

<f:websocket>

的侦听器。此侦听器更新对话的历史记录，并呈现包含对话的文本区域。 以下是代码摘录：

<h:form id="formId" prependId="false">
    <h:commandButton value="Send the question" action="#{bb.send}">
    </h:commandButton>
    <f:websocket channel="chat" scope="view" onmessage="socketListener"
                 onerror="websocketErrorListener" 
                 onclose="websocketCloseListener">
       <f:ajax event="streamingfinished" listener="#{bb.updateConversation}"
               render="conversationId"/>
   </f:websocket>
   <h:outputText value="Conversation :"/>
   <h:inputTextarea id="conversationId" rows="30" cols="50" readonly="true"
                    value="#{bb.conversation}" />
   ...
</h:form>

执行期间一切正常，直到监听器执行为止。对话已更新（因此侦听器正确执行），但由于错误“websocket 为空”而未呈现对话的文本区域。我不明白我的错误。这可能是 Payara 或

<f:websocket>

中的错误吗？堆栈跟踪显示，当侦听器由 Websocket 的 Java API 实现 Tyrus 处理时发生错误：

    [Payara 6.2024.7] [GRAVE] [] [jakarta.enterprise.resource.webcontainer.faces.context] [tid: _ThreadID=103 _ThreadName=http-thread-pool::http-listener-1(4)] [timeMillis: 1725610467356] [levelValue: 1000] [[
  java.lang.NullPointerException: Cannot invoke "jakarta.faces.component.UIWebsocket.isRendered()" because "websocket" is null
java.lang.NullPointerException: Cannot invoke "jakarta.faces.component.UIWebsocket.isRendered()" because "websocket" is null
    at com.sun.faces.push.WebsocketFacesListener.processEvent(WebsocketFacesListener.java:100)
    at jakarta.faces.event.SystemEvent.processListener(SystemEvent.java:124)
    at jakarta.faces.event.ComponentSystemEvent.processListener(ComponentSystemEvent.java:109)
    at com.sun.faces.application.applicationimpl.Events.processListenersAccountingForAdds(Events.java:285)
    at com.sun.faces.application.applicationimpl.Events.invokeViewListenersFor(Events.java:202)
    at com.sun.faces.application.applicationimpl.Events.publishEvent(Events.java:102)
    at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:118)
    at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:110)
    at jakarta.faces.application.ApplicationWrapper.publishEvent(ApplicationWrapper.java:660)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:81)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:72)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:178)
    at jakarta.faces.webapp.FacesServlet.executeLifecyle(FacesServlet.java:692)
    at jakarta.faces.webapp.FacesServlet.service(FacesServlet.java:449)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1554)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:331)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:211)
    at org.glassfish.tyrus.servlet.TyrusServletFilter.doFilter(TyrusServletFilter.java:83)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:253)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:211)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:257)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:166)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:757)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:577)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:158)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:372)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:239)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:520)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:217)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:174)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:153)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:196)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:88)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:246)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:178)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:118)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:96)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:51)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:510)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:82)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:83)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:101)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:535)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:515)
    at java.base/java.lang.Thread.run(Thread.java:1583

Answer 1

正如 @BalusC 在他的评论中所说，删除

prependId="false"

是解决方案。