Getting Stated on Spring MVC with Google AppEngine

Since, Appengine was the best free java server to deploy application. This is why good to integrate java frameworks to google appengine.

As this point, assume that you already create your Google Appengine project. However if you don't know how to create GAE project go here.

Pre-requisites:

* Eclipse Kepler + Spring 3.2.4 + Google App Engine 1.9.7 + Java 7
* Download Spring jars

Extract the zip files and copy jars to war/WEB-INF/lib/(for deployment) and include the jars in project library.

1. Create mv-dispacher-servlet.xml.

<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:mvc="http://www.springframework.org/schema/mvc" 
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 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">
 
 <!-- 
        Component 
        https://developers.google.com/appengine/articles/spring_optimization
 -->
 <!-- 
 <context:component-scan base-package="com.winzter.springmvc.controllers">
  <context:exclude-filter type="regex" expression="com.winzter.springmvc.controllers.GuessController.*" />
 </context:component-scan>
    -->
 
 <!-- DEFINE Your bean Here -->
  <bean class="com.winzter.springmvc.controllers.GuessController" />
  <bean  class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping" />
   <bean class="com.winzter.airgames.bigbarnword.controllers.FriendsController" />
 
 <mvc:annotation-driven />
  
 <!-- Bean to show you Di in GAE, via Spring, also init the MovieController -->
 <bean class="com.winzter.springmvc.controllers.GuessController">
  <property name="message">
   <value>Hello World</value>
  </property>
  <!--constructor-arg name="message" value="Help ET go home" /-->
 </bean>
 <!-- bean class="com.winzter.airgames.bigbarnword.controllers.FriendsController">
  <property name="message">
   <value>Hello World</value>
  </property>
 </bean-->
  
 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
 
 <!-- 
  This serve for JSPs
  Every controller menthod return string, it file /pages/string.jsp 
 -->
  <property name="prefix">
   <value>/</value>
  </property>
  
  <property name="suffix">
   <value>.jsp</value>
  </property>
 </bean>

</beans>

2. Update/add code below to web.xml

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

<servlet-mapping>
  <servlet-name>mvc-dispatcher</servlet-name>
  <url-pattern>/</url-pattern>
</servlet-mapping>

<context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>/WEB-INF/mvc-dispatcher-servlet.xml</param-value>
</context-param>

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