Question

i am new to primeface.

i have tried to test an example of primefaces about tag 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

Answer 1

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.

Answer 2

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

友情链接