Spring MVC 3.0 404 error - model-view-controller

Question

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 any of my breakpoints in the controller class. Please let me know if there's something I'm missing. Thanks!
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>Edit</td>
<td>Delete</td>
<td>Add</td>
</tr>
</c:forEach>
</tbody>
</table>
<c:if test="${empty persons}">
There are currently no persons in the list. Add a person.
</c:if>
</body>
</html>

Answer 1

Possibly this might be your issue:
<context:component-scan base-package="src" />
You are supposed to input your base package name for "base-package". eg
<context:component-scan base-package="com.stackoverflow.project" />
where "com.stackoverflow.project" is the package name you used in your controller.
eg: Controller Class:
package com.stackoverflow.project.controller
#Controller
public class DashboardController { ...
Hope that helps.