problem with primefaces library (jsf)_问答_开发者

开发者 https://www.devze.com 2023-01-07 01:13 出处：网络

i am new to primeface. i have tried to test an example of primefaces abouttag开发者_如何学Python as in its documentation,

相关专题：jsf primefaces

i am new to primeface.

i have tried to test an example of primefaces about tag开发者_如何学Python as in its documentation,

this is my jsf page code:

<%@ 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>

and this is my backbean code: [code]

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;
}
}

but when i tried to running it. i got this error:

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)

what is wrong? how can i solve it? i am using tomcat 6 thanks in advance

java.lang.IllegalStateException: 
  Component javax.faces.component.UIViewRoot@ed32c4 not expected type. 
  Expected: javax.faces.component.UIForm. Perhaps you're missing a tag?

The exception suggests that you've a h:form somewhere in the page which is not been placed inside a f:view.

Since your code example looks fine (apart from the ugly scriptlets), you're likely not running the code you think you're running. Redo the build and deployment and check if you did everything correctly.

They changed the uri in version 3. Use: http://primefaces.org/ui