Spring MVC 3.0 404 error while accessing controller class

**felicia** · Jul 6th, 2011, 02:19 PM

I'm trying to build an application using Spring MVC 3.0 within Eclipse using the Dynamic Web Project. I'm able to get to the initial page, but I can not navigate to any other pages from there w/out getting a 404 error and I'm not hitting the controller class.

applicationContext.xml

Code:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	   		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
	   		http://www.springframework.org/schema/context
	   		http://www.springframework.org/schema/context/spring-context-3.0.xsd
			http://www.springframework.org/schema/mvc 
			http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

	<!-- Activates various annotations to be detected in bean classes -->
	<context:annotation-config />

	<!-- Scans the classpath for annotated components that will be auto-registered 
		as Spring beans. For example @Controller and @Service. Make sure to set the 
		correct base-package -->
	<context:component-scan base-package="src" />

	<!-- Configures the annotation-driven Spring MVC Controller programming 
		model. Note that, with Spring 3.0, this tag works in Servlet MVC only! -->
	<mvc:annotation-driven />

	<!-- Load Hibernate related configuration -->
	<import resource="hibernate-context.xml" />

</beans>

spring-servlet.xml

Code:

<?xml version="1.0" encoding="UTF-8"?>
<beans xsi:schemaLocation=" http://www.springframework.org/schema/beans 
       ...
        xmlns:mvc="http://www.springframework.org/schema/mvc"  
        xmlns:aop="http://www.springframework.org/schema/aop" 
        xmlns:context="http://www.springframework.org/schema/context" 
        xmlns:p="http://www.springframework.org/schema/p" 
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xmlns="http://www.springframework.org/schema/beans"> 

	<bean
        class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />

    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
	   		
	
	<!-- Declare a view resolver -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
           <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
           <property name="prefix" value="/WEB-INF/jsp"/>
           <property name="suffix" value=".jsp"/>
        </bean>


</beans>

web.xml

Code:

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	
	<servlet>
		<servlet-name>spring</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>
            /WEB-INF/applicationContext.xml
     </param-value>
    </init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	
	<servlet-mapping>
		<servlet-name>spring</servlet-name>
		<url-pattern>/SpringHibernateExample/*</url-pattern>
	</servlet-mapping>
    
     <welcome-file-list>
        <welcome-file>/jsp/personspage.jsp</welcome-file>
    </welcome-file-list>

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

MainController.java

Code:

package controller;

import java.util.List;

import javax.annotation.Resource;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;

import service.PersonService;
import domain.Person;

/**
 * Handles and retrieves person request
 */
@Controller
@RequestMapping("/main")
public class MainController {

	protected static Logger logger = Logger.getLogger("controller");

	@Resource(name = "personService")
	private PersonService personService;

	/**
	 * Handles and retrieves all persons and show it in a JSP page
	 * 
	 * @return the name of the JSP page
	 */
	@RequestMapping(value = "/persons", method = RequestMethod.GET)
	public String getPersons(Model model) {

		logger.debug("Received request to show all persons");

		// Retrieve all persons by delegating the call to PersonService
		List<Person> persons = personService.getAll();

		// Attach persons to the Model
		model.addAttribute("persons", persons);

		// This will resolve to /WEB-INF/jsp/personspage.jsp
		return "personspage";
	}

	/**
	 * Retrieves the add page
	 * 
	 * @return the name of the JSP page
	 */
	@RequestMapping(value = "/persons/add", method = RequestMethod.GET)
	public String getAdd(Model model) {
		logger.debug("Received request to show add page");

		// Create new Person and add to model
		// This is the formBackingOBject
		model.addAttribute("personAttribute", new Person());

		// This will resolve to /WEB-INF/jsp/addpage.jsp
		return "addpage";
	}

	/**
	 * Adds a new person by delegating the processing to PersonService. Displays
	 * a confirmation JSP page
	 * 
	 * @return the name of the JSP page
	 */
	@RequestMapping(value = "/persons/add", method = RequestMethod.POST)
	public String add(@ModelAttribute("personAttribute") Person person) {
		logger.debug("Received request to add new person");

		// The "personAttribute" model has been passed to the controller from
		// the JSP
		// We use the name "personAttribute" because the JSP uses that name

		// Call PersonService to do the actual adding
		personService.add(person);

		// This will resolve to /WEB-INF/jsp/addedpage.jsp
		return "addedpage";
	}

	/**
	 * Deletes an existing person by delegating the processing to PersonService.
	 * Displays a confirmation JSP page
	 * 
	 * @return the name of the JSP page
	 */
	@RequestMapping(value = "/persons/delete", method = RequestMethod.GET)
	public String delete(
			@RequestParam(value = "id", required = true) Integer id, Model model) {

		logger.debug("Received request to delete existing person");

		// Call PersonService to do the actual deleting
		personService.delete(id);

		// Add id reference to Model
		model.addAttribute("id", id);

		// This will resolve to /WEB-INF/jsp/deletedpage.jsp
		return "deletedpage";
	}

	/**
	 * Retrieves the edit page
	 * 
	 * @return the name of the JSP page
	 */
	@RequestMapping(value = "/persons/edit", method = RequestMethod.GET)
	public String getEdit(
			@RequestParam(value = "id", required = true) Integer id, Model model) {
		logger.debug("Received request to show edit page");

		// Retrieve existing Person and add to model
		// This is the formBackingOBject
		model.addAttribute("personAttribute", personService.get(id));

		// This will resolve to /WEB-INF/jsp/editpage.jsp
		return "editpage";
	}

	/**
	 * Edits an existing person by delegating the processing to PersonService.
	 * Displays a confirmation JSP page
	 * 
	 * @return the name of the JSP page
	 */
	@RequestMapping(value = "/persons/edit", method = RequestMethod.POST)
	public String saveEdit(@ModelAttribute("personAttribute") Person person,
			@RequestParam(value = "id", required = true) Integer id, Model model) {
		logger.debug("Received request to update person");

		// The "personAttribute" model has been passed to the controller from
		// the JSP
		// We use the name "personAttribute" because the JSP uses that name

		// We manually assign the id because we disabled it in the JSP page
		// When a field is disabled it will not be included in the
		// ModelAttribute
		person.setId(id);

		// Delegate to PersonService for editing
		personService.edit(person);

		// Add id reference to Model
		model.addAttribute("id", id);

		// This will resolve to /WEB-INF/jsp/editedpage.jsp
		return "editedpage";
	}

}

personspage.jsp

Code:

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!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>People Page</title>
</head>
<body>
<h1>Persons</h1>

<c:url var="addUrl" value="/main/persons/add" />
<table style="border: 1px solid; width: 500px; text-align:center">
	<thead style="background:#fcf">
		<tr>
			<th>First Name</th>
			<th>Last Name</th>
			<th>Money</th>
			<th colspan="3"></th>
		</tr>
	</thead>
	<tbody>
	<c:forEach items="${persons}" var="person">
			<c:url var="editUrl" value="/persons/edit?id=${person.id}" />
			<c:url var="deleteUrl" value="/persons/delete?id=${person.id}" />
		<tr>
			<td><c:out value="${person.firstName}" /></td>
			<td><c:out value="${person.lastName}" /></td>
			<td><c:out value="${person.money}" /></td>
			<td><a href="${editUrl}">Edit</a></td>
			<td><a href="${deleteUrl}">Delete</a></td>
			<td><a href="${addUrl}">Add</a></td>
		</tr>
	</c:forEach>
	</tbody>
</table>

<c:if test="${empty persons}">
	There are currently no persons in the list. <a href="${addUrl}">Add</a> a person.
</c:if>

</body>
</html>

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