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POReturning object using @ResponseBody with spring 3 doesn't work
 

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  1. POReturning object using @ResponseBody with spring 3 doesn't work
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    <p>I am trying to use @responseBody in the controller to return a object am i getting exception. I have jackson jar in the application still it says the following error ClassNotFoundException could not intiatiate </p> <pre><code>HTTP Status 500 - -------------------------------------------------------------------------------- type Exception report message description The server encountered an internal error () that prevented it from fulfilling this request. exception root cause org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter#0': Cannot create inner bean '(inner bean)' of type [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter] while setting bean property 'messageConverters' with key [6]; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#8': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.jackson.map.ObjectMapper root cause org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#8': Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Could not instantiate bean class [org.springframework.http.converter.json.MappingJacksonHttpMessageConverter]: Constructor threw exception; nested exception is java.lang.NoClassDefFoundError: Could not initialize class org.codehaus.jackson.map.ObjectMapper </code></pre> <p>This is my code----></p> <pre><code> import org.springframework.stereotype.Controller; import org.springframework.validation.BindingResult; 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.ResponseBody; import org.springframework.web.bind.annotation.SessionAttributes; import org.springframework.web.servlet.ModelAndView; import com.lol.laks.sample.beans.*; @Controller @SessionAttributes public class ContactsController { @RequestMapping(value = "/addContact", method = RequestMethod.POST, produces="application/json") public @ResponseBody Contacts addContact(@ModelAttribute("contact") Contacts contact,BindingResult result) { System.out.println("First Name:" + contact.getFirstname() + "Last Name:" + contact.getLastname()); return contact; } @RequestMapping("/") public ModelAndView showContacts() { return new ModelAndView("contacts", "command", new Contacts()); } } </code></pre> <p>This is the jsp--></p> <pre><code>&lt;%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; (http://www.w3.org/TR/html4/loose.dtd%27%3E) &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"&gt; &lt;title&gt;Insert title here&lt;/title&gt; &lt;/head&gt; &lt;%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%&gt; &lt;body&gt; &lt;form:form method="post" action="addContact"&gt; &lt;table&gt; &lt;tr&gt; &lt;td&gt;&lt;form:label path="firstname"&gt;First Name&lt;/form:label&gt;&lt;/td&gt; &lt;td&gt;&lt;form:input path="firstname" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;&lt;form:label path="lastname"&gt;Last Name&lt;/form:label&gt;&lt;/td&gt; &lt;td&gt;&lt;form:input path="lastname" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;&lt;form:label path="lastname"&gt;Email&lt;/form:label&gt;&lt;/td&gt; &lt;td&gt;&lt;form:input path="email" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;&lt;form:label path="telephone"&gt;Telephone&lt;/form:label&gt;&lt;/td&gt; &lt;td&gt;&lt;form:input path="telephone" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td colspan="2"&gt; &lt;input type="submit" value="Add Contact"/&gt; &lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;/form:form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>This is the servlet.xml---></p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 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"&gt; (http://www.springframework.org/schema/context/spring-context-3.0.xsd%27%3E) &lt;context:component-scan base-package="com.tcs.laks.sample" /&gt; &lt;mvc:annotation-driven /&gt; &lt;bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver"&gt; &lt;property name="mediaTypes"&gt; &lt;map&gt; &lt;entry key="html" value="text/html"/&gt; &lt;entry key="json" value="application/json"/&gt; &lt;/map&gt; &lt;/property&gt; &lt;property name="viewResolvers"&gt; &lt;list&gt; &lt;bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"&gt; &lt;!-- &lt;property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /&gt; --&gt; &lt;property name="prefix" value="/WEB-INF/jsp/" /&gt; &lt;property name="suffix" value=".jsp" /&gt; &lt;/bean&gt; &lt;/list&gt; &lt;/property&gt; &lt;property name="defaultViews"&gt; &lt;list&gt; &lt;bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView"&gt; &lt;property name="prefixJson" value="true"/&gt; &lt;/bean&gt; &lt;/list&gt; &lt;/property&gt; &lt;/bean&gt; &lt;/beans&gt; </code></pre> <p>This is the beans</p> <pre><code>import org.springframework.stereotype.Component; @Component public class Contacts { private String firstname; private String lastname; private String email; private String telephone; public String getFirstname() { return firstname; } public void setFirstname(String firstname) { this.firstname = firstname; } public String getLastname() { return lastname; } public void setLastname(String lastname) { this.lastname = lastname; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public String getTelephone() { return telephone; } public void setTelephone(String telephone) { this.telephone = telephone; } } </code></pre> <p>Please Tell me why it is not able to instantiate the class though the proper jars are included when Spring 3 automatically converts the object to json?</p>
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    1. COI found the answer Myself the main problem was with the servlet.xml file adding <bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> did the work
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