[RESOLVIDO] Erro de Iniciante - Vraptor

JavaChild Membro desde: 27/04/2010 19:06:49 Mensagens: 102 Offline

Boa noite a todos...

Estou começando a estudar VRaptor, pela apostila da Caelum FJ28.

Logo no inicio, seguindo todos os passos da apostila, me deparei com um erro ao acessar um determinado JSP.

Segue abaixo a classe MundoController.java:

Abaixo o erro:

26/05/2011 20:01:08 org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet default threw exception
br.com.caelum.vraptor.view.ResultException: org.apache.jasper.JasperException: java.lang.NullPointerException
        at br.com.caelum.vraptor.view.DefaultPageResult.forward(DefaultPageResult.java:69)
        at br.com.caelum.vraptor.extra.ForwardToDefaultViewInterceptor.intercept(ForwardToDefaultViewInterceptor.java:59)
        at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.interceptor.OutjectResult.intercept(OutjectResult.java:65)
        at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.interceptor.ExecuteMethodInterceptor.intercept(ExecuteMethodInterceptor.java:75)
        at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.interceptor.ParametersInstantiatorInterceptor.intercept(ParametersInstantiatorInterceptor.java:77)
        at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.interceptor.InstantiateInterceptor.intercept(InstantiateInterceptor.java:42)
        at br.com.caelum.vraptor.core.InstantiatedInterceptorHandler.execute(InstantiatedInterceptorHandler.java:47)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.interceptor.InterceptorListPriorToExecutionExtractor.intercept(InterceptorListPriorToExecutionExtractor.java:46)
        at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.interceptor.FlashInterceptor.intercept(FlashInterceptor.java:80)
        at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.interceptor.ResourceLookupInterceptor.intercept(ResourceLookupInterceptor.java:67)
        at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:54)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.core.ToInstantiateInterceptorHandler.execute(ToInstantiateInterceptorHandler.java:56)
        at br.com.caelum.vraptor.core.DefaultInterceptorStack.next(DefaultInterceptorStack.java:65)
        at br.com.caelum.vraptor.core.DefaultRequestExecution.execute(DefaultRequestExecution.java:70)
        at br.com.caelum.vraptor.VRaptor$1.insideRequest(VRaptor.java:92)
        at br.com.caelum.vraptor.ioc.spring.SpringProvider.provideForRequest(SpringProvider.java:56)
        at br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:89)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
        at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:864)
        at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
        at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1665)
        at java.lang.Thread.run(Thread.java:619)
Caused by: org.apache.jasper.JasperException: java.lang.NullPointerException
        at org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:536)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:368)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at br.com.caelum.vraptor.core.DefaultStaticContentHandler.deferProcessingToContainer(DefaultStaticContentHandler.java:64)
        at br.com.caelum.vraptor.VRaptor.doFilter(VRaptor.java:80)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646)
        at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
        at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
        at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
        at br.com.caelum.vraptor.view.DefaultPageResult.forward(DefaultPageResult.java:67)
        ... 49 more
Caused by: java.lang.NullPointerException
        at org.apache.jsp.WEB_002dINF.jsp.mundo.boasVindas_jsp._jspInit(boasVindas_jsp.java:22)
        at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)
        at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:164)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:338)
        ... 66 more

Abaixo o web.xml:

O que pode ser???

GUJ Hacker Membro desde: 08/07/2007 00:08:14 Mensagens: 6396 Offline

vc tem jars de jsp no WEB-INF/lib? se sim, tente tirá-los

JavaChild Membro desde: 27/04/2010 19:06:49 Mensagens: 102 Offline

Olá Lucas,

Descobri o que era, eu tinha a lib do guava.jar e do google-collect.jar.

Tirei a do google-collect.jar e funcionou.

Agora estou com um problema que quando mando pela jsp listar os produtos do Controller, ele fica em branco.

lista.jsp

ProdutoController.java

E quando vou no FF ele aparece tudo em branco, se olhar o que foi executado pelo Firebug. Dentro do c:forEach, aparece os objetos Produtos, e os resto tudo em branco.

O que pode ser?

GUJ Hacker Membro desde: 08/07/2007 00:08:14 Mensagens: 6396 Offline

se está aparecendo <c:forEach no firebug, quer dizer que você não importou a taglib c nos seus jsps

JavaChild Membro desde: 27/04/2010 19:06:49 Mensagens: 102 Offline

Adicionei a linha:

E quando fui rodar não funcionou.
Ele reclama que "items=${produtoList}" não pode ser aceito.

O erro:

GUJ Hacker Membro desde: 08/07/2007 00:08:14 Mensagens: 6396 Offline

o import correto é:

faltou um /jsp

JavaChild Membro desde: 27/04/2010 19:06:49 Mensagens: 102 Offline

Puts...

Esqueci.

Funcionou aqui mano... Valeu!

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