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getOriginalFilename() resulta em NullPointerException

Referente ao curso Spring MVC I: Criando aplicações web, no capítulo Enviando arquivos ao servidor e atividade Enviando arquivos ao servidor

por Patrícia Pereira de Souza
| 36.9k xp | 8 posts

Não consigo imprimir o nome do arquivo através do método getOriginalFilename(), quando faço upload do arquivo dá uma exception

A exception reclama do erro na linha 48 do controller quando vou imprimir o nome do arquivo no console através do Syso:

System.out.println(sumario.getOriginalFilename());

Controller

package br.com.smartmarket.controller;

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.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.support.RedirectAttributes;

import br.com.smartmarket.dao.ProdutoDAO;
import br.com.smartmarket.model.Produto;
import br.com.smartmarket.model.TipoPreco;
import br.com.smartmarket.validation.ProdutoValidation;

@Controller
@RequestMapping("/produtos")
public class produtosController {
    @Autowired
    private ProdutoDAO produtoDao;


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

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

        return modelAndView;

    }

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

        System.out.println(sumario.getOriginalFilename());

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


        produtoDao.gravar(produto);

        redirectAttributes.addFlashAttribute("sucesso", "Produto cadastrado com sucesso");

        return new ModelAndView("redirect:produtos");
    }

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

        return modelAndView;
    }

}

Produto

package br.com.smartmarket.model;

import java.util.Calendar;
import java.util.List;

import javax.persistence.ElementCollection;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

import org.springframework.format.annotation.DateTimeFormat;

@Entity
public class Produto {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private String produto;
    private String categoria;
    private String descricao;

    @DateTimeFormat
    private Calendar dataCadastro;

    @ElementCollection
    private List<Preco> precos;

    private String sumarioPath;

    public List<Preco> getPrecos() {
        return precos;
    }

    public void setPrecos(List<Preco> precos) {
        this.precos = precos;
    }

    public Calendar getDataCadastro() {
        return dataCadastro;
    }

    public void setDataCadastro(Calendar dataCadastro) {
        this.dataCadastro = dataCadastro;
    }

    public String getProduto() {
        return produto;
    }

    public void setProduto(String produto) {
        this.produto = produto;
    }

    public String getCategoria() {
        return categoria;
    }

    public void setCategoria(String categoria) {
        this.categoria = categoria;
    }

    public String getDescricao() {
        return descricao;
    }

    public void setDescricao(String descricao) {
        this.descricao = descricao;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Override
    public String toString() {
        return "Produto [produto=" + produto + ", categoria=" + categoria + ", descricao=" + descricao + "]";
    }

    public String getSumarioPath() {
        return sumarioPath;
    }

    public void setSumarioPath(String sumarioPath) {
        this.sumarioPath = sumarioPath;
    }

}

AppWebConfiguration

package br.com.smartmarket.configuracaomvc;

import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import org.springframework.format.datetime.DateFormatter;
import org.springframework.format.datetime.DateFormatterRegistrar;
import org.springframework.format.support.DefaultFormattingConversionService;
import org.springframework.format.support.FormattingConversionService;
import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.multipart.support.StandardServletMultipartResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

import br.com.smartmarket.controller.homeController;
import br.com.smartmarket.dao.ProdutoDAO;

@EnableWebMvc // habilitando o uso do MVC no projeto
@ComponentScan(basePackageClasses = { homeController.class, ProdutoDAO.class }) // mostrando
                                                                                // para
public class AppWebConfiguration {

    @Bean // classe gerenciada pelo Spring
    public InternalResourceViewResolver internalResourceViewResolver() {
        InternalResourceViewResolver resolver = new InternalResourceViewResolver();
        resolver.setPrefix("/WEB-INF/views/");
        resolver.setSuffix(".jsp");

        return resolver;
    }

    @Bean
    public MessageSource messageSource() {
        ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
        messageSource.setBasename("/WEB-INF/messages");
        messageSource.setDefaultEncoding("UTF-8");
        messageSource.setCacheSeconds(1);

        return messageSource;
    }

    @Bean
    public FormattingConversionService mvcConversionService() {
        DefaultFormattingConversionService conversionService = new DefaultFormattingConversionService();
        DateFormatterRegistrar formatterRegistrar = new DateFormatterRegistrar();
        formatterRegistrar.setFormatter(new DateFormatter("dd/MM/yyyy"));
        formatterRegistrar.registerFormatters(conversionService);

        return conversionService;
    }

    @Bean
    public MultipartResolver multipartResolver() {
        return new StandardServletMultipartResolver();
    }
}

ServletSpringMVC

package br.com.smartmarket.configuracaomvc;

import javax.servlet.Filter;
import javax.servlet.MultipartConfigElement;
import javax.servlet.ServletRegistration.Dynamic;

import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

public class ServletSpringMVC extends AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return null;
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[] { AppWebConfiguration.class, JPAConfiguration.class };
    }

    @Override
    protected String[] getServletMappings() {
        return new String[] { "/" };
    }

    @Override
    protected Filter[] getServletFilters() {
        CharacterEncodingFilter encondingFilter = new CharacterEncodingFilter();
        encondingFilter.setEncoding("UTF-8");
        return new Filter[] {};
    }

    @Override
    protected void customizeRegistration(Dynamic registration) {
        registration.setMultipartConfig(new MultipartConfigElement(""));
    }

}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>br.com.smartmarket</groupId>
    <artifactId>smartnarket</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <build>
        <finalName>smartmarket</finalName>
        <plugins>
            <plugin>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <failOnMissingWebXml>false</failOnMissingWebXml>
                </configuration>
            </plugin>
             <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-eclipse-plugin</artifactId>
                <version>2.9</version>
                <configuration>
                    <downloadSources>true</downloadSources>
                    <downloadJavadocs>true</downloadJavadocs>
                    <wtpversion>2.0</wtpversion>
                    <wtpContextName>/spring4upload</wtpContextName>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <packaging>war</packaging>
    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <springframework.version>4.2.0.RELEASE</springframework.version>
        <jackson.version>2.5.3</jackson.version>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>


    <dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.2.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.apache.tomcat</groupId>
            <artifactId>tomcat-servlet-api</artifactId>
            <version>8.5.11</version>
        </dependency>


        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${springframework.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${springframework.version}</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson.version}</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp.jstl</groupId>
            <artifactId>jstl-api</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>org.glassfish.web</groupId>
            <artifactId>jstl-impl</artifactId>
            <version>1.2</version>
        </dependency>
        <!-- configuracao jpa e driver -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
            <version>4.3.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>4.3.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate.javax.persistence</groupId>
            <artifactId>hibernate-jpa-2.1-api</artifactId>
            <version>1.0.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>4.1.0.RELEASE</version>
        </dependency>

        <!-- Logging -->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.6.1</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>1.6.1</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.6.1</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.16</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.18</version>
        </dependency>

        <!-- bean validation -->
        <dependency>
            <groupId>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>1.1.0.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.2.4.Final</version>
        </dependency>



    </dependencies>


</project>
1 resposta
por Giovana Delfino
| 31.6k xp | 63 posts

Olá Patricia.

Esse erro pode ter acontecido pois a variável sumario pode estar NULL e aí quando vc tenta acessar um método de algo que é NULL ele dá o erro.

Mas se sumario nao for NULL pode ter acontecido algum problema dentro do método getOriginalFilename. Voce poderia testar isso e se o erro persistir mandar o erro completo por aqui?