Problem on Java approach to web scripts not working

[billwyuan]

Hello, a similar issue was posted before, but it happens again, it can't invoke java from freemark template.

With a simple java class in default Alfresco 4.1.3, tomcat, the server can't recognize java.

When hit URL: http://localhost:8080/alfresco/service/demo/simple

Got this message:
  "message" : "03230014 Wrapped Exception (with status template): 03230099 Error during processing of the template 'Expression demo is undefined on line 5, column 15 in simple.get.json.ftl.'. Please contact your system administrator.", 
  "exception" : "org.springframework.extensions.webscripts.WebScriptException - 03230014 Wrapped Exception (with status template): 03230099 Error during processing of the template 'Expression demo is undefined on line 5, column 15 in simple.get.json.ftl.'. Please contact your system administrator.",


1. My Java class:
import java.util.HashMap;
import java.util.Map;

import org.springframework.extensions.webscripts.Cache;
import org.springframework.extensions.webscripts.DeclarativeWebScript;
import org.springframework.extensions.webscripts.Status;
import org.springframework.extensions.webscripts.WebScriptRequest;

public class SimpleWebScript extends DeclarativeWebScript {
   @Override
   protected Map<String, Object> executeImpl(WebScriptRequest req,
         Status status, Cache cache) {

      // put all the objects that you need in renditions to the model map
      Map<String, Object> model = new HashMap<String, Object>();
      model.put("demo", "Happy coding! ");
      System.out.println("hello1");
      return model;
   }
}
2. My bean descrption: web-scripts-application-context.xml
<beans>

   <bean id="webscript.org.alfresco.demo.simple.get" class="org.alfresco.module.demoscripts.SimpleWebScript"
      parent="webscript">
   </bean>
   <bean id="webscript.org.alfresco.demo.declarative.get"
      class="org.alfresco.module.demoscripts.SimpleDeclarativeWebscript"
      parent="webscript">
   </bean>
</beans>

3.My webscript desc: simple.get.desc.xml

<webscript>

  <shortname>The World's Simplest Webscript</shortname>

  <description>Hands back a little bit of JSON</description>

  <url>/demo/simple</url>

  <authentication>none</authentication>

  <format default="json">argument</format>

  <family>Alfresco Java-Backed WebScripts Demo</family>

</webscript>

4. simple.get.json.ftl
{

   "demo": "${demo}",

}

[billwyuan]

<?xml version='1.0' encoding='UTF-8'?>

<!DOCTYPE beans PUBLIC '-//SPRING//DTD BEAN 2.0//EN' 'http://www.springframework.org/dtd/spring-beans-2.0.dtd'>



<beans>

   <bean id="webscript.org.alfresco.demo.simple.get" class="org.alfresco.module.demoscripts.SimpleWebScript"
      parent="webscript">
   </bean>
   <bean id="webscript.org.alfresco.demo.declarative.get"
      class="org.alfresco.module.demoscripts.SimpleDeclarativeWebscript"
      parent="webscript">
   </bean>
</beans>


<webscript>

  <shortname>The World's Simplest Webscript</shortname>

  <description>Hands back a little bit of JSON</description>

  <url>/demo/simple</url>

  <authentication>none</authentication>

  <format default="json">argument</format>

  <family>Alfresco Java-Backed WebScripts Demo</family>

</webscript>