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

4 月，1 周 Questions & Answers 1002

我在Omniface socket demo（http://showcase.omnifaces.org/push/socket）的基础上创建了一个测试应用程序，用于一个计数器，它在Tomcat 8.5上运行时会随着单击而递增，但当我部署到WebSphere 9服务器时，不知怎的，这个计数器不起作用

在WebSphere9中，当我在浏览器中查看源代码时，会出现此错误

<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中的<o:socket行。xhtml：

<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中启用了socket端点。xml，请参见下面的web。xml文件

网络。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。爪哇

    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，而不是在WebSphere9服务器上进行转换

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

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