NullPointerException使用JSF 2.3 websocket使用JSF导航。

问题描述 投票：0回答：1

我有一些使用primefaces菜单的简单导航。然而，我在两个页面上都使用了jsf websockets，这导致在页面之间导航时出现NullPointerException。这导致在页面之间导航时出现NullPointerException。当导航到Portfolio时，如果Portfolio页面中存在web套接字，那么当试图导航到Portfolio页面并返回到Stocks页面时，就会返回NullPointerException异常。如果我从Portfolio页面中删除所有的web套接字，那么导航就会正常工作--第一次点击会导致下面的异常，但第二次就会正常。如果我从两个页面中删除所有的web套接字，导航就能正常工作，但显然我需要web套接字来实现页面功能。

EDIT: 我现在做了一个最小的可重复的例子，并修改了下面的代码。请注意，h:commandLink被包含在内，当选择page2时，它们也会导致同样的问题。

java.lang.NullPointerException
at com.sun.faces.push.WebsocketFacesListener.processEvent(WebsocketFacesListener.java:118)
at javax.faces.event.SystemEvent.processListener(SystemEvent.java:147)
at javax.faces.event.ComponentSystemEvent.processListener(ComponentSystemEvent.java:134)
at com.sun.faces.application.ApplicationImpl.processListenersAccountingForAdds(ApplicationImpl.java:2340)
at com.sun.faces.application.ApplicationImpl.invokeViewListenersFor(ApplicationImpl.java:2158)
at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:337)
at com.sun.faces.application.ApplicationImpl.publishEvent(ApplicationImpl.java:292)
at javax.faces.application.ApplicationWrapper.publishEvent(ApplicationWrapper.java:748)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:113)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:223)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:671)
at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1580)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:338)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.glassfish.tyrus.servlet.TyrusServletFilter.doFilter(TyrusServletFilter.java:305)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:250)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:652)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:591)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:371)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:238)
at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:463)
at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:168)
at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:206)
at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:180)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:242)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:539)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:593)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:573)
at java.lang.Thread.run(Thread.java:748)

这是我的菜单页面。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
  xmlns:h="http://xmlns.jcp.org/jsf/html"
  xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
  xmlns:p="http://primefaces.org/ui"
  xmlns:f="http://xmlns.jcp.org/jsf/core">
<f:view>
<h:head>
</h:head>

<h:body>

    <div class="column side">
        <h2>Side</h2>
        <h:form>
            <h:commandLink value="Page1" actionListener="#{menuViewTest.selectPageOne}" />
            <h:commandLink value="Page2" actionListener="#{menuViewTest.selectPageTwo}" />
        </h:form>
    </div>

    <div class="column middle">
        <h2>Middle</h2>
            <ui:include src="#{menuViewTest.view}">
            </ui:include>
    </div>
</h:body>
</f:view>
</html>

支持MenuTest的bean:

@Named("menuViewTest")
@SessionScoped
public class MenuViewTest implements Serializable {

private static final long serialVersionUID = -1015364935820045523L;
private String view;

public void selectPageOne() {
    setView("page1.xhtml");
}

public void selectPageTwo() {
    setView("page2.xhtml");
}

public String getView() {
    return view;
}

public void setView(String view) {
    this.view = view;
}

  public String getSelectPageOne(){
    return "page1.xhtml";
}

public String getSelectPageTwo(){
    return "page2.xhtml";
}

}

Page1:

<ui:composition  xmlns="http://www.w3.org/1999/xhtml"
          xmlns:h="http://xmlns.jcp.org/jsf/html"
          xmlns:f="http://xmlns.jcp.org/jsf/core"
          xmlns:p="http://primefaces.org/ui"
          xmlns:ui="http://xmlns.jcp.org/jsf/facelets">

<script type="text/javascript">

    function notifyListener(message, channel, event) {
        console.log("notifyListener message: " + message);
        console.log("notifyListener channel: " + channel);
        console.log("notifyListener event: " + event);
    }
</script>

<h2>Page 1</h2>

<f:websocket channel="notify" onmessage="notifyListener" />

</ui:composition>

第2页。

<ui:composition  xmlns="http://www.w3.org/1999/xhtml"
             xmlns:h="http://xmlns.jcp.org/jsf/html"
             xmlns:f="http://xmlns.jcp.org/jsf/core"
             xmlns:p="http://primefaces.org/ui"
             xmlns:ui="http://xmlns.jcp.org/jsf/facelets">
<script type="text/javascript">

        function notifyListener(message, channel, event) {
        console.log("notifyListener message: " + message);
        console.log("notifyListener channel: " + channel);
        console.log("notifyListener event: " + event);
    }
</script>

<h2>Page 2</h2>

<f:websocket channel="notify2" onmessage="notifyListener" />
</ui:composition>
jsf websocket jsf-2.3
1个回答
1
投票

通过升级到最新的稳定版Glassfish (5.1.0) JSF 2.3版本和mojarra 2.3.9，websocket异常得到了修复。

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