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，用于计数器在点击时递增，并且它在Tomcat 8.5上运行，不知何故，当我部署到Webphere 9服务器时，这不起作用。
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<o:socket行：
<o:socket channel="counter" onmessage="updateCounter" onclose="onclosePush" connected="#{pushBean.connected}" />
我可以告诉<o:socket>标签不起作用，我在web.xml中启用了套接字端点，请参阅下面的web.xml文件。
网嗯
<?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>
push bean.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，而不是在Websphere 9服务器上执行它。
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>