Expressão EL não resolvida exibindo lista na página JSP com Spring MVC

Question

Sep 21, 2013, 08:17 PM

Expressão EL não resolvida exibindo lista na página JSP com Spring MVC

Estou tentando fazer algo muito simples. Eu só quero exibir uma lista em uma página JSP de um aplicativo Spring MVC. Eu pesquisei bastante e há muitos exemplos (incluindo alguns no Stackoverflow), mas isso não está funcionando para mim. Estou usando Maven e Spring 3.2.4. Estes são meus arquivos:

Item.java

public class Item 
{
    private final String value;

    public Item(String value)
    {
        this.value = value;
    }

    public String getValue()
    {
        return value;
    }
}

MainController.java

@Controller
public class MainController 
{
    @RequestMapping("/")
    public String home(ModelMap map) 
    {           
    final List<Item> items = new ArrayList<Item>();
        items.add(new Item("Value 1"));
        items.add(new Item("Value 2"));
        items.add(new Item("Value 3"));
        items.add(new Item("Value 5"));     
        map.addAttribute(items);
        return "list";
    }   
}

list.jsp

<!DOCTYPE html>
<%@ 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="spring"%>

<html lang="en">
    <head>
        <title>Naked List</title>
    <body>
        <h2>Naked List</h2>
        <p> 
            <c:forEach items="${itemList}" var="item">
                <c:out value="${item.value}"/>
                <br/>
            </c:forEach>
        </p>            
    </body>
</html>

applicationContext.xml

<?xml  version="1.0" encoding="UTF-8"?>
<beans xmlns="...">

    <context:annotation-config />
    <context:component-scan base-package="org.ne.nakedlist" />

    <mvc:annotation-driven/>
    <mvc:resources mapping="/resources/**" location="/resources/"/>

    <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
         <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>  

</beans>

webxml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Naked List</display-name>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

    <listener>
        <listener-class>
            org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>

    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>
            org.springframework.web.servlet.DispatcherServlet
        </servlet-class>        
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>spring</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>  
 </web-app>

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>org.ne.nakedlist</groupId>
<artifactId>org.ne.nakedlist</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>Naked List</name>
<description>Naked List</description>
<properties>
    <java.version>1.7</java.version>
    <org.springframework.version>3.2.4.RELEASE</org.springframework.version>
</properties>
<dependencies>

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.0.1</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.9</version>
    </dependency>
    <dependency>
        <groupId>taglibs</groupId>
        <artifactId>standard</artifactId>
        <version>1.1.2</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    <dependency>
        <groupId>javax.inject</groupId>
        <artifactId>javax.inject</artifactId>
        <version>1</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${org.springframework.version}</version>
    </dependency>

</dependencies>
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>2.5.1</version>
            <configuration>
                <source>${java.version}</source>
                <target>${java.version}</target>
                <encoding>${project.build.sourceEncoding}</encoding>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>2.3</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>copy</goal>
                    </goals>
                    <configuration>
                        <artifactItems>
                            <artifactItem>
                                <groupId>org.mortbay.jetty</groupId>
                                <artifactId>jetty-runner</artifactId>
                                <version>7.4.5.v20110725</version>
                                <destFileName>jetty-runner.jar</destFileName>
                            </artifactItem>
                        </artifactItems>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
    <finalName>nakedlist</finalName>
</build>

Quando executo o aplicativo, o que obtenho é: