Spring MVC and DWR - making it work

[LeoNYC]

Hi!

I have a simple, working Spring MVC application that has one bean configuration file: myapp-servlet.xml

In that file, I initialize data source, data beans, Data Access Object (DAO) and service classes.

I want to retrieve some data on the front end using DWR Ajax.

I added dwr.jar to lib, dwr servlet to web.xml, added DTD references to DWR in bean declarations, added dwr.xmlthat specifies the service method I would like to call from JavaScript:

<dwr>
  <allow>
    <create creator="new" javascript="ServiceManager">
      <param name="class" value="myapp.service.SimpleProductManager"/>
    </create>
  </allow>
</dwr>

The JavaScript correctly invokes the methods on the ServiceManager from JSP. One major problem - the DAO and other classes are not being initialized/injected. I.e., when DWR invokes the service class, the myapp-servlet.xml is not being loaded and the DAO object called from the service class is not being properly initiatized (so I get the NullPointerException).

How can I fix that and force DWR to inject all the objects defined in myapp-servlet.xml?

[TSH]

Maybe I don't understand your question, but I use Dependency Injection as usual to my objects and then expose them to DWR, like.

<bean id="myController" class="my.namespace.MyController">   
  <property name="myProp" ref="myProp"/> 
  <dwr:remote javascript="MyController" />
</bean>

[LeoNYC]

Maybe I don't understand your question, but I use Dependency Injection as usual to my objects and then expose them to DWR, like.

<bean id="myController" class="my.namespace.MyController">   
  <property name="myProp" ref="myProp"/> 
  <dwr:remote javascript="MyController" />
</bean>

I tried that. I added the dwr:remote line to the myapp-servlet.xml like this:

<bean id="productManager" class="springapp.service.SimpleProductManager">
  <property name="productDao" ref="productDao"/>
  <dwr:remote javascript="ProductManager" />
</bean>

ProductManager, in turn, calls the productDao class that pull data from the database. The DAO still remained null and uninitialized when productManager is invoked by DWR from JSP - so the problem persists.

In myapp-servlet.xml I have the DAO declared as follows - do I need to add/change anything:

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
      <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
      <property name="url" value="jdbc:mysql://localhost:3306/spring"/>
      <property name="username"  value="root"/>
      <property name="password" value="password"/>
</bean>
    
<bean id="productDao" class="springapp.repository.JdbcProductDao">
   <property name="dataSource" ref="dataSource" />
</bean>

Here is DWR call from JSP:

<script type='text/javascript' src='/springdwr/dwr/interface/ProductManager.js'></script>
<script type='text/javascript' src='/springdwr/dwr/engine.js'></script>
<script type='text/javascript' src='/springdwr/dwr/util.js'></script>

<script>
	function handleGetData(str) {
  		alert(str);
	}
	ProductManager.getProductDesc(handleGetData);	
</script>