spring framework problem

[maheedar sand]

Hi,

I've started practicing spring in action 3rd edition by craig walls. I stucked up in spring mvc as we are using it in our project. I tried to run 1st program as described in the book, but I'm facing an exception No default constructor found and Error in creating bean 'homeController'. I verified all the rest of the classes in the project like service, domain, configuration files, database files; they are working but when I want to see the outcome of the application it is throwing exception.

I'm not able to understand where exactly the problem is located and how to resolve. Please, I need a helping hand in resolving this.

One more doubt I'm having is; we have both spring and javaee6 supporting DI. As a developer which one I should support(standards wise). Please clarify me if mistaken.

Thanks and Regards,
sathish.g.

[shivang sarawagi]

Please post the code in order to get the problem figured out.

[maheedar sand]

Hi,

I've started practicing spring in action 3rd edition by craig walls. I stucked up in spring mvc as we are using it in our project. I tried to run 1st program as described in the book, but I'm facing an exception No default constructor found and Error in creating bean 'homeController'. I verified all the rest of the classes in the project like service, domain, configuration files, database files; they are working but when I want to see the outcome of the application it is throwing exception.

I'm not able to understand where exactly the problem is located and how to resolve. Please, I need a helping hand in resolving this.

One more doubt I'm having is; we have both spring and javaee6 supporting DI. As a developer which one I should support(standards wise). Please clarify me if mistaken.

Controller - HomeController class

 package com.habuma.spitter.mvc;

import java.util.Map;

import javax.inject.Inject;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import com.habuma.spitter.service.SpitterService;

@Controller
public class HomeController {
	public static final int DEFAULT_SPITTLES_PER_PAGE = 25;
	private int spittlesPerPage = DEFAULT_SPITTLES_PER_PAGE;
	public int getSpittlesPerPage() {
		return spittlesPerPage;
	}

	public void setSpittlesPerPage(int spittlesPerPage) {
		this.spittlesPerPage = spittlesPerPage;
	}

	private SpitterService spitterService;
	
	@Inject
	public HomeController(SpitterService spitterService)	{
		this.spitterService = spitterService;
	}
	
	@RequestMapping({"/", "/home"})
	public String showHomePage(Map<String, Object> model)	{
		model.put("spittles", spitterService.getRecentSpittles(spittlesPerPage));
		
		return "home";
	}
}

SpitterServiceImpl

package com.habuma.spitter.service;

import java.util.List;

import com.habuma.spitter.domain.Spittle;
import com.habuma.spitter.persistence.SpitterDao;

public class SpitterServiceImpl implements SpitterService {

	@Override
	public List<Spittle> getRecentSpittles(int count) {
		List<Spittle> recentSpittles = spitterDao.getRecentSpittle();
		
		return recentSpittles;
	}
	
	private SpitterDao spitterDao;

	public void setSpitterDao(SpitterDao spitterDao) {
		this.spitterDao = spitterDao;
	}
}

spitter-service.xml
<?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/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 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"> <context:component-scan base-package="com.habuma.spitter.service"></context:component-scan> </beans>

spitter-servlet.xml
<?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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 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"> <mvc:resources location="/resources/" mapping="/resources/**"/> <mvc:annotation-driven/> <context:component-scan base-package="com.habuma.spitter.mvc"/> <!-- <bean 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> <property name="suffix" value=".jsp"></property> </bean> --> <bean class="org.springframework.web.servlet.view.tiles2.TilesConfigurer"> <property name="definitions"> <list> <value>/WEB-INF/views/**/views.xml</value> </list> </property> </bean> <bean class="org.springframework.web.servlet.view.tiles2.TilesViewResolver"></bean> </beans>

web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <context-param> <param-name>contextConfigLocation</param-name> <param-value> classpath:resources/spitter-service.xml classpath:resources/persistence-context.xml classpath:resources/spitter-data.xml </param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>spitter</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spitter</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>

home.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %>
<%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>

<div>
	<h2>A global community of friends and strangers spitting out their inner-most 
		and personal thoughts on the web for everyone else to see.
	</h2>
	<h3>Look at what these people are spitting right now...</h3>
	
	<ol class="spittle-test">
		<c:forEach items="${spittles}" var="spittle">
			<spring:url value="/spitters/{spitterName}" var="spitter_url">
				<spring:param name="spitterName" value="${spittle.spitter.username}"></spring:param>
			</spring:url>
			
			<li>
				<span class="spittleListImage">
					<img src="../images/nature.jpg" width="48" border="0" align="middle" 
						 onError="this.src='<spring:url value="../images"/>/error-icon.jpg';"/>
				</span>
				<span class="spittleListText">
					<a >
						<c:out value="${spittle.spitter.username}"></c:out>
					</a>
					-<c:out value="${spittle.text}"/><br/>
					<small>
						<fmt:formatDate value="${spittle.when}" pattern="hh:mma MMM d, yyyy"/>
					</small>
				</span>
			</li>
		</c:forEach>
	</ol>
</div>

Thanks and Regards,
sathish.g.

[Prajakta Acharya]

I have not seen the code in detail so might have missed something.
But what I noticed in your controller class is that you have a customized constructor and so the default constructor will have to be put explicitly.
I guess it is required for the framework to instantiate your controller class.

[Nam Ha Minh]

Yes, you must create a non-argument constructor in the HomeController class besides the current one:

    @Inject  
    public HomeController(SpitterService spitterService)    {  
        this.spitterService = spitterService;  
    }  

[maheedar sand]

Yes
It is working when I placed default constructor.

Thank You for everyone for spending time and giving valuable suggestions.