Java backed webscript exception

[dvdschyff]

I am following this tutorial http://wiki.alfresco.com/wiki/Java-backed_Web_Scripts_Samples but I have run into a problem.
I get the following excetion:  java.lang.ClassCastException: intecon.demoscripts.SimpleWebScript cannot be cast to org.springframework.extensions.webscripts.WebScript

I searched around but could not find something that looked like this problem.


Log

 2012-10-05 14:38:23,118  ERROR [web.context.ContextLoader] [Thread-2] Context initialization failed
 java.lang.ClassCastException: intecon.demoscripts.SimpleWebScript cannot be cast to org.springframework.extensions.webscripts.WebScript
   at org.springframework.extensions.webscripts.DeclarativeRegistry.initWebScripts(DeclarativeRegistry.java:462)
   at org.springframework.extensions.webscripts.DeclarativeRegistry.reset(DeclarativeRegistry.java:178)
   at org.springframework.extensions.webscripts.AbstractRuntimeContainer.reset(AbstractRuntimeContainer.java:259)
   at org.alfresco.repo.web.scripts.RepositoryContainer.init(RepositoryContainer.java:633)
   at org.alfresco.repo.web.scripts.RepositoryContainer$5.execute(RepositoryContainer.java:603)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
   at org.alfresco.repo.web.scripts.RepositoryContainer.reset(RepositoryContainer.java:598)
   at org.alfresco.repo.web.scripts.RepositoryContainer$4.doWork(RepositoryContainer.java:553)
   at org.alfresco.repo.security.authentication.AuthenticationUtil.runAs(AuthenticationUtil.java:519)
   at org.alfresco.repo.web.scripts.RepositoryContainer.onApplicationEvent(RepositoryContainer.java:557)
   at org.alfresco.repo.management.SafeApplicationEventMulticaster.multicastEventInternal(SafeApplicationEventMulticaster.java:209)
   at org.alfresco.repo.management.SafeApplicationEventMulticaster.multicastEvent(SafeApplicationEventMulticaster.java:180)
   at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:303)
   at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:911)
   at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:428)
   at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
   at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
   at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
   at org.alfresco.web.app.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:63)
   at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)
   at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
   at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
   at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
   at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)
   at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:637)
   at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:563)
   at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:498)
   at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
   at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)
   at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
   at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
   at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
   at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
   at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
   at org.apache.catalina.core.StandardService.start(StandardService.java:519)
   at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
   at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
   at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

webscript-context.xml

   <bean id="webscript.intecon.demoscripts.simple.get" 
         class="intecon.demoscripts.SimpleWebScript"
        parent="webscript" />
‍‍‍‍

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="">argument</format>
  <family>Alfresco Java-Backed WebScripts Demo</family>
</webscript>‍‍‍‍‍‍‍‍

SimpleWebScript

package intecon.demoscripts;



import java.io.IOException;

import org.springframework.extensions.webscripts.AbstractWebScript;
import org.springframework.extensions.webscripts.WebScriptException;
import org.springframework.extensions.webscripts.WebScriptRequest;
import org.springframework.extensions.webscripts.WebScriptResponse;
import org.json.JSONException;
import org.json.JSONObject;

public class SimpleWebScript extends AbstractWebScript
{
    public void execute(WebScriptRequest req, WebScriptResponse res)
        throws IOException
    {
       try
       {
          // build a json object
          JSONObject obj = new JSONObject();
          
          // put some data on it
          obj.put("field1", "data1");
          
          // build a JSON string and send it back
          String jsonString = obj.toString();
          res.getWriter().write(jsonString);
       }
       catch(JSONException e)
       {
          throw new WebScriptException("Unable to serialize JSON");
       }
    }    
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Any help resolving this would be much appreciated. Let me know if any more information is needed.

Edit: Alfresco version is Community 4.0e

[abarisone]

Hi,
try modifying

public class SimpleWebScript extends AbstractWebScript‍

with

public class SimpleWebScript extends DeclarativeWebScript‍

Also look at this topic https://forums.alfresco.com/en/viewtopic.php?f=53&t=45048
and this https://forums.alfresco.com/en/viewtopic.php?f=53&t=44976

Regards,
Andrea

[dvdschyff]

Thanks for the reply, but I still get this exception:

 2012-10-08 10:58:18,495  ERROR [web.context.ContextLoader] [Thread-2] Context initialization failed
 java.lang.ClassCastException: intecon.demoscripts.SimpleWebScript cannot be cast to org.springframework.extensions.webscripts.WebScript
   at org.springframework.extensions.webscripts.DeclarativeRegistry.initWebScripts(DeclarativeRegistry.java:462)
   at org.springframework.extensions.webscripts.DeclarativeRegistry.reset(DeclarativeRegistry.java:178)
   at org.springframework.extensions.webscripts.AbstractRuntimeContainer.reset(AbstractRuntimeContainer.java:259)
   at org.alfresco.repo.web.scripts.RepositoryContainer.init(RepositoryContainer.java:633)
   at org.alfresco.repo.web.scripts.RepositoryContainer$5.execute(RepositoryContainer.java:603)
   at org.alfresco.repo.transaction.RetryingTransactionHelper.doInTransaction(RetryingTransactionHelper.java:388)
   at org.alfresco.repo.web.scripts.RepositoryContainer.reset(RepositoryContainer.java:598)
   at org.alfresco.repo.web.scripts.RepositoryContainer$4.doWork(RepositoryContainer.java:553)
   at org.alfresco.repo.security.authentication.AuthenticationUtil.runAs(AuthenticationUtil.java:519)
   at org.alfresco.repo.web.scripts.RepositoryContainer.onApplicationEvent(RepositoryContainer.java:557)
   at org.alfresco.repo.management.SafeApplicationEventMulticaster.multicastEventInternal(SafeApplicationEventMulticaster.java:209)
   at org.alfresco.repo.management.SafeApplicationEventMulticaster.multicastEvent(SafeApplicationEventMulticaster.java:180)
   at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:303)
   at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:911)
   at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:428)
   at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:276)
   at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:197)
   at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)
   at org.alfresco.web.app.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:63)
   at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)
   at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
   at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
   at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
   at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)
   at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:637)
   at org.apache.catalina.startup.HostConfig.deployDescriptors(HostConfig.java:563)
   at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:498)
   at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
   at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)
   at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
   at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
   at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)
   at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
   at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445)
   at org.apache.catalina.core.StandardService.start(StandardService.java:519)
   at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
   at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
   at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

DeclarativeWebScript extends AbstractWebScript so it makes sense that the same ClassCastException still happens.

I tried the following and it works fine.

   public static void main(String[] args) {
      // TODO Auto-generated method stub
      intecon.demoscripts.SimpleWebScript sws = new SimpleWebScript();
      WebScript ws = (WebScript)sws; 
      System.out.println("Cast done");
   }
‍‍‍‍‍‍‍‍

The jars I compile against are the ones in Alfresco\tomcat\webapps\alfresco\WEB-INF\lib
I am completely out of ideas on where to go look for the problem.

[lementree]

Hi,
Can you try by addidng Override

public class SimpleWebScript extends AbstractWebScript
        @SuppressWarnings("unchecked")
   @Override
   public void execute(WebScriptRequest req, WebScriptResponse res)
   {
        }

‍‍‍‍‍‍‍‍‍

[dvdschyff]

I got working by placing the SimpleWebScript.class file in C:\Alfresco\tomcat\webapps\alfresco\WEB-INF\classes\intecon\demoscripts and not in C:\Alfresco\tomcat\shared\classes\intecon\demoscripts. I am not yet sure why that is the case, but for now I can live with it.

Thanks for all the help