为什么 Omnifaces Websocket <o:socket> 不能与 Websphere 9 一起使用？

Question

我有一个基于 Omniface 套接字演示 (http://showcase.omnifaces.org/push/socket) 创建的测试应用程序，用于在单击时递增的计数器，它在 Tomcat 8.5 上工作，当我部署到 Webphere 时不知何故9 服务器无法正常工作。

在 Websphere 9 中，当我在浏览器中查看源代码时出现此错误。

<script type="text/javascript" id="j_id_h">Error 500: javax.servlet.ServletException: o:socket endpoint is not enabled. You need to set web.xml context param 'org.omnifaces.SOCKET_ENDPOINT_ENABLED' with value 'true'.

以上错误来自 PushBean.xhtml 中的行 <o:socket:

<o:socket channel="counter" onmessage="updateCounter" onclose="onclosePush" connected="#{pushBean.connected}" />

我可以看出 <o:socket> 标记不起作用，我已经在 web.xml 中启用了套接字端点，请参阅下面的 web.xml 文件。

Web.xml


    <?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
      <display-name>WebSocketServerJSFOmni</display-name>
      <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
      </welcome-file-list>
      <context-param>
        <param-name>org.omnifaces.SOCKET_ENDPOINT_ENABLED</param-name>
        <param-value>true</param-value>
      </context-param>
      <servlet>
        <servlet-name>Faces Servlet</servlet-name>
        <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
      </servlet>
      <servlet-mapping>
        <servlet-name>Faces Servlet</servlet-name>
        <url-pattern>*.xhtml</url-pattern>
      </servlet-mapping>
    </web-app>

PushBean.java

    package org.omnifaces.showcase.push;

    import java.io.Serializable;
    import java.util.concurrent.atomic.AtomicLong;

    import javax.inject.Inject;
    import javax.inject.Named;

    import org.omnifaces.cdi.Push;
    import org.omnifaces.cdi.PushContext;
    import org.omnifaces.cdi.ViewScoped;

    @Named
    @ViewScoped
    public class PushBean implements Serializable {

        private static AtomicLong counter = new AtomicLong();

        private boolean connected;

        @Inject @Push(channel="counter")
        private PushContext push;

        public void toggle() {
            connected = !connected;
        }

        public void increment() {
            long newvalue = counter.incrementAndGet();
            push.send(newvalue);
        }

        public boolean isConnected() {
            return connected;
        }

        public Long getCount() {
            return counter.get();
        }

    }

PushBean.xhtml


    <!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:ui="http://java.sun.com/jsf/facelets"
        xmlns:h="http://java.sun.com/jsf/html"
        xmlns:f="http://java.sun.com/jsf/core"
        xmlns:o="http://omnifaces.org/ui"
        xmlns:of="http://omnifaces.org/functions">

    <h:head>
    </h:head>

    <body>

        <h3>Global counter</h3>
        <p>
            Below is a static counter which has the same value application wide.
        </p>

        <h1><h:panelGroup id="count">#{pushBean.count}</h:panelGroup></h1>

        <h:form>
            <p>
                If you enable the push, then a websocket will be opened.
                Note that it's by default always auto-connected when included in the page, but for demo purposes we're initially disabling it.
            </p>
            <p>
                <h:panelGroup id="toggle">
                    Push is #{pushBean.connected ? 'connected' : 'disconnected'} 
                    <h:commandButton value="#{pushBean.connected ? 'disconnect' : 'connect'} it" action="#{pushBean.toggle}">
                        <f:ajax render="toggle increment :count"/>
                    </h:commandButton>
                </h:panelGroup>
            </p>
            <p>
                If push is connected and you press the "increment!" button, then the static counter will increment in bean and the push will send out the new value to the same channel in all connected clients.
                To see it yourself, open the same page in multiple tabs/windows/browsers/machines and trigger the push in only one of it.
                Note that the counter also won't increment from other side if push is still disconnected on current page.
            </p>
            <p>
                <h:commandButton id="increment" value="increment!" action="#{pushBean.increment}" disabled="#{not pushBean.connected}">
                    <f:ajax />
                </h:commandButton>
            </p>
        </h:form>


        <!-- NOTE: having inline script in XHTML like below is bad practice. -->
        <!-- It's included directly in XHTML just for sake of demo. -->
        <!-- In real world code, put it in a JS file :) -->

        <script>
            function updateCounter(newvalue) {
                //$("#count").text(newvalue);
                document.getElementById("count").innerHTML = newvalue;
            }

            function onclosePush(code) {
                if (code == -1) {
                    alert("Oops! Your browser doesn't seem to support web sockets. The push functionality won't work.")
                }
                else if (code != 1000) {
                    alert("Oops! Push has stopped working with error code " + code + "! Reload the page.")
                }
            }
        </script>

        <!-- End of bad practice ;) -->


        <o:socket channel="counter" onmessage="updateCounter" onclose="onclosePush" connected="#{pushBean.connected}" />


    </body>
    </html>

<o:socket> 应该转换为 JavaScript，它在 Websphere 9 服务器上没有这样做。

Answer 1

对于 WAS 9，我必须在 StartupServletContextListener 之前在 web.xml 中显式注册侦听器。

https://github.com/omnifaces/omnifaces/issues/502

<listener>
        <listener-class>org.omnifaces.ApplicationListener</listener-class>
    </listener>
    <listener>
        <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class>
    </listener>

Answer 2

你需要把omnifaces.jar不在通用服务器库中，是项目库中必要的locale库。

通过该操作，上下文首先开始，然后是 omnifaces

For more information check here

为什么 Omnifaces Websocket <o:socket> 不能与 Websphere 9 一起使用？

Why is Omnifaces Websocket <o:socket> not working with Websphere 9?

java

websphere

websocket

omnifaces