我是primeface的新手。
我试图在其文档中测试有关标签的primefaces示例，
这是我的 jsf 页面代码：
<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://primefaces.prime.com.tr/ui" prefix="p"%>
<%@taglib uri="http://java.sun.com/jsf/html" prefix="h"%>
<%@taglib uri="http://java.sun.com/jsf/core" prefix="f"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<f:view>
<h:form>
<h:outputText id="txt_count" value="#{counterBean.count}" />
<p:poll actionListener="#{counterBean.increment}" update="txt_count" />
</h:form>
</f:view>
</body>
</html>
这是我的后台代码：[代码]
import javax.faces.event.ActionEvent;
public class CounterBean {
private int count;
public void increment(ActionEvent actionEvent) {
count++;
}
//getters and setters
public int getCount() {
return count;
}
public void setCount(int count) {
this.count = count;
}
}
但是当我尝试运行它时。我收到了这个错误：
java.lang.IllegalStateException: Component javax.faces.component.UIViewRoot@ed32c4 not expected type. Expected: javax.faces.component.UIForm. Perhaps you're missing a tag?
com.sun.faces.taglib.html_basic.FormTag.setProperties(FormTag.java:199)
javax.faces.webapp.UIComponentClassicTagBase.findComponent(UIComponentClassicTagBase.java:586)
javax.faces.webapp.UIComponentClassicTagBase.doStartTag(UIComponentClassicTagBase.java:1070)
com.sun.faces.taglib.html_basic.FormTag.doStartTag(FormTag.java:273)
org.apache.jsp.index_jsp._jspx_meth_h_005fform_005f0(index_jsp.java:120)
org.apache.jsp.index_jsp._jspService(index_jsp.java:93)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:428)
com.sun.faces.application.ViewHandlerImpl.executePageToBuildView(ViewHandlerImpl.java:444)
com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:116)
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
怎么了？我该如何解决？我正在使用 tomcat 6 在此先感谢