HTTP Status 500 – Internal Server Error - org.apache.jasper.JasperException: An exception occurred processing [/WEB-INF/views/produtos/form.jsp] at line [13]

Roberto, poderia enviar o erro completo? Acredito que esteja faltando algumas informações que poderiam ajudar a identificar o problema. Aproveitando, manda o código do form.jsp também, por favor.

Root Cause

java.lang.IllegalArgumentException: Mapping mappingName not found: PC#gravar org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder.fromMappingName(MvcUriComponentsBuilder.java:245) java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) java.base/java.lang.reflect.Method.invoke(Method.java:564) org.apache.el.parser.AstFunction.getValue(AstFunction.java:199) org.apache.el.parser.AstValue.getValue(AstValue.java:137) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:190) org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:701) org.apache.jsp.WEB_002dINF.views.produtos.form_jsp.jspService(formjsp.java:160) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:172) org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228) org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852) javax.servlet.http.HttpServlet.service(HttpServlet.java:634) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) Note A pilha de erros completa da causa principal está disponível nos logs do servidor

Stacktrace: org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:625) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:514) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:172) org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228) org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852) javax.servlet.http.HttpServlet.service(HttpServlet.java:634) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) Root Cause

javax.el.ELException: Problems calling function [s:mvcUrl] org.apache.el.parser.AstFunction.getValue(AstFunction.java:211) org.apache.el.parser.AstValue.getValue(AstValue.java:137) org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:190) org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:701) org.apache.jsp.WEB_002dINF.views.produtos.form_jsp.jspService(formjsp.java:160) org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:476) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:172) org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303) org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1228) org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1011) org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:955) org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877) org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961) org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:852) javax.servlet.http.HttpServlet.service(HttpServlet.java:634) org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837) javax.servlet.http.HttpServlet.service(HttpServlet.java:741) org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88) org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

HTTP Status 500 – Internal Server Error Type Exception Report

Message An exception occurred processing [WEB-INF/views/produtos/form.jsp] at line [13]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.apache.jasper.JasperException: An exception occurred processing [WEB-INF/views/produtos/form.jsp] at line [13]

10: 11: 12: 13: <form:form action="${s:mvcUrl('PC#gravar').build() }" method="POST" 14: commandName="produto"> 15:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ taglib uri="http://www.springframework.org/tags" prefix="s" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Livros de Java, Android, iPhone, Ruby, PHP e muito mais - Casa do Código</title>
</head>
    <form:form action="${s:mvcUrl('PC#gravar').build() }" method="POST"
        commandName="produto">
        <div>
            <label>Título</label>
            <input type="text" name="titulo" />
            <form:errors path="titulo" />
        </div>
        <div>
            <label>Descrição</label>
            <textarea rows="10" cols="20" name="descricao"></textarea>
            <form:errors path="descricao" />
        </div>
        <div>
            <label>Páginas</label>
            <input type="text" name="paginas" />
            <form:errors path="paginas" />
        </div>
        <c:forEach items="${tipos}" var="tipoPreco" varStatus="status">
            <div>
                <label>${tipoPreco}</label>
                <input type="text" name="precos[${status.index}].valor" />
                <input type="hidden" name="precos[${status.index}].tipo" value="${tipoPreco}"/>
            </div>
        </c:forEach>

        <button type="submit">Cadastrar</button>
    </form:form>
</body>
</html>

coloquei o erro e o form.jsp acima, desde já, obrigado pela ajuda.

O erro estava no controller

package br.com.casadocodigo.loja.controllers;

import java.util.List;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.annotation.InitBinder;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import br.com.casadocodigo.loja.daos.ProdutoDAO;
import br.com.casadocodigo.loja.models.Produto;
import br.com.casadocodigo.loja.models.TipoPreco;
import br.com.casadocodigo.loja.validation.ProdutoValidation;

@Controller
@RequestMapping("/produtos")
public class ProdutosController {

    @Autowired
    private ProdutoDAO dao;

    @InitBinder
    public void initBinder(WebDataBinder binder) {
        binder.addValidators(new ProdutoValidation());
    }

    @RequestMapping("/form")
    public ModelAndView form() {
        ModelAndView modelAndView = new ModelAndView("produtos/form");
        modelAndView.addObject("tipos", TipoPreco.values());
        return modelAndView;
    }

    @RequestMapping(method=RequestMethod.POST)
    public ModelAndView gravar(@Valid Produto produto, BindingResult result, 
                RedirectAttributes redirectAttributes){

        if(result.hasErrors()) {
            return form();
        }

        System.out.println(produto);
        dao.gravar(produto);
        redirectAttributes.addFlashAttribute("sucesso", "Produto cadastrado com sucesso!");
        return new ModelAndView("redirect:produtos");
    }

    @RequestMapping( method=RequestMethod.GET)
    public ModelAndView listar() {
        List<Produto> produtos = dao.listar();
        ModelAndView modelAndView = new ModelAndView("produtos/lista");
        modelAndView.addObject("produtos", produtos);
        return modelAndView;
    }
}