AJAXing with Spring using DWR

Recently I have an opportunity to work with Spring Framework. With Spring I have used following technologies:

1. Spring MVC
2. Ajax - DWR
3. Hibernate
4. Tiles
5. Acegi Security

It was really a nice experience working with Spring and other supporting technologies.

I found a littlet bit problem in getting DWR 2.0 working with Spring 2.0.

Approach that worked for me as follows:

1. Web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app schemalocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/j2ee" version="2.4">
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/applicationContext*.xml</param-value>
</context-param>
<!-- Listner Config-->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>*.html</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
<!-- Ajax DWR config ends -->
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>
index.jsp
</welcome-file>
</welcome-file-list>
<servlet>

2. Application-Context.xml

<!-- DWR Configurations -->
<dwr:controller id="dwrController" debug="true"/>
<!-- Configure DWR handlers -->
<bean id="dwrUrlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="alwaysUseFullPath" value="true"/>
<property name="mappings">
<props>
<prop key="/dwr/**/*">dwrController</prop> </props> </property>
</bean>
<!-- Configure Convertor -->
<dwr:configuration>
<dwr:convert type="bean" class="com.app.domain.User" />
</dwr:configuration>

<!-- Configure Ajax controller -->
<bean id="ajaxController" class="com.app.controller.dwr.AjaxController">
<dwr:remote javascript="UserList">
<dwr:include method="getUser"/>
<dwr:include method="updateUser"/>
</dwr:remote>
<property name="userDao" ref="userDao"/>
</bean>

3. JSP Page

Add following lines to jsp page:
<script type='text/javascript' src='/spring/dwr/interface/UserList.js'></script>
<script type='text/javascript' src='/spring/dwr/engine.js'></script>
<script type='text/javascript' src='/spring/dwr/util.js'></script>

Define call back javascript function and attach that to some event

<script type="text/javascript">
function editUser(id) {
UserList.getUser(id,function(array){DWRUtil.setValue(fname,array.fname); });
}
</script>

Finally deploy the application and restart the server and here is your DWR wroking...

To test it you can use: http://localhost:8080/spring/dwr/index.html

Resources:

• DWR
• Nabble Users
• Internna