Erro aon tentar acessar método de um bean em página .xhtml

Pessoal,

Dada a seguinte classe

package br.ufpb.nti.diploma.bean;
...
/* varios imports*/
...
public class ConsultaDiplomaBean {
...
public boolean chamarRelatorio() {
		 
     String caminhoRelJasper = "ufpb/nti/diploma/ireport/jasper/Teste3.jasper";
         
      InputStream relJasper = getClass().getResourceAsStream(caminhoRelJasper)
		
       // Parametros do relatorios
       Map parametros = new HashMap();
       parametros.put("situacao", 1);
         
         try {
         
        	 GerarPDF gera = new GerarPDF(); 
        	 try {
			
                        gera.geraPDFaqui(relJasper, parametros);
		        return true;
				
		  } catch (ClassNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				return false;
			}      	  
        	 
         } catch (IOException io) {
      	 
        	 return false;   
         } catch (SQLException e) {
        	 
        	 return false;	 
         }
 	 
     }
...
}

o seguinte faces-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<faces-config version="1.2" xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xi="http://www.w3.org/2001/XInclude" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd">
...
<managed-bean>
	<managed-bean-name>consultaDiplomaBean</managed-bean-name>
	<managed-bean-class>br.ufpb.nti.diploma.bean.ConsultaDiplomaBean</managed-bean-class>
	<managed-bean-scope>session</managed-bean-scope>
</managed-bean>
</faces-config>

e a seguinte página .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:f="http://java.sun.com/jsf/core"
	xmlns:h="http://java.sun.com/jsf/html"
	xmlns:rich="http://richfaces.org/rich"
	xmlns:a4j="http://richfaces.org/a4j">
...
<rich:datascroller for="dipTable" maxPages="20" align="center" style="margin-top:4px" rendered="#{consultaDiplomaBean.verTabela}"/>
				<div>
					<h:commandButton action="#{consultaDiplomaBean.chamarRelatorio}" value="Gerar Relatorio" rendered="true" style="margin-left:300px; margin-top:10px"/>
				</div>
			
		</h:form>
	</ui:define>
</ui:composition>
</html>

quando tento chamar o método “chamarRelatorio()” na página acima, aparece a seguinte mensagem de erro no Tomcat

HTTP Status 500 -
type Exception report

message
description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: #{consultaDiplomaBean.chamarRelatorio}: java.lang.NullPointerException
	javax.faces.webapp.FacesServlet.service(FacesServlet.java:277)
	org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)
	org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
	org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
	org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
...

Não estou entendendo por qual razão a chamada do método na página associada ao bean está causando a exceção supracitada ???

2 Respostas

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