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Editorial Team
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Asked: 2026-06-10T02:34:01+00:00

This is my code: botoes.xhtml <?xml version=1.0 encoding=ISO-8859-1 ?> <!DOCTYPE html PUBLIC -//W3C//DTD XHTML

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This is my code: botoes.xhtml

<?xml version="1.0" encoding="ISO-8859-1" ?>
<!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">

<h:head>
    <title>K19 - Eventos</title>
</h:head>

<h:body>
    <h:form>
        <h:commandButton id="botao-jonas" value="Jonas" disabled="false" actionListener="#{BotaoBean.sorteiaBotao}" />
        <h:commandButton id="botao-marcelo" value="Marcelo" disabled="true" actionListener="#{BotaoBean.sorteiaBotao}" />
        <h:commandButton id="botao-rafael" value="Rafael" disabled="true" actionListener="#{BotaoBean.sorteiaBotao}" />
    </h:form>
</h:body>
</html>

and BotaoBean.java:

import javax.faces.bean.ManagedBean;
import javax.faces.component.*;
import javax.faces.event.ActionEvent;


@ManagedBean(name="BotaoBean")
public class BotaoBean {

    public void sorteiaBotao(ActionEvent event) {
        UIComponent formulario = event.getComponent().getParent();

        UIComponent botaoJonas = formulario.findComponent("botao-jonas");
        UIComponent botaoMarcelo = formulario.findComponent("botao-marcelo");
        UIComponent botaoRafael = formulario.findComponent("botao-rafael");

        botaoJonas.getAttributes().put("disabled",true);
        botaoMarcelo.getAttributes().put("disabled",true);
        botaoRafael.getAttributes().put("disabled",true);

        double numero = Math.random();

        if (numero<1.0/3.0) {
            botaoJonas.getAttributes().put("disabled",false);
        } else if (numero<2.0/3.0) {
            botaoMarcelo.getAttributes().put("disabled",false);
        } else {
            botaoRafael.getAttributes().put("disabled",false);
        }
    }    
}

I run and gives the following exception:

javax.servlet.ServletException: /botoes.xhtml: Property ‘sorteiaBotao’
not found on type BotaoBean
javax.faces.webapp.FacesServlet.service(FacesServlet.java:321)

I don’t know how to solve. I did the same as tutorial example. Can anyone help me?

Thanks!

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1 Answer

  1. Editorial Team

    The exception indicates that the actionListener="#{BotaoBean.sorteiaBotao}" is been treated as a value expression instead of a method expression (it’s looking for a property and thus it’s trying to just print the value returned by a getter, which obviously doesn’t exist at all; as the exception says).

    This in turn indicates that the whole component and the attribute are not been recognized by the JSF renderer.

    This in turn indicates that the h: tag library of the component isn’t (properly) been declared.

    And indeed, you’ve there a dangling space in the taglib URI:

    xmlns:h=" http://java.sun.com/jsf/html"

    This space doesn’t belong there in the taglib URI. Fix it accordingly:

    xmlns:h="http://java.sun.com/jsf/html"

    Don’t forget to do the same for f: tag library, it has also a misplaced space in its URI.

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