How to search for all sub folders in a folder using CMIS

Hi,

I am using Alfresco v4.1 and cmis v0.13 jar files.

I want to know 2 things:

1)How do I find list of Sites in root folder
2) How do I find list of sub folders in a folder?

I tried following but I got exceptions --

 CmisObject object = cmisSession.getObject(cmisSession.createObjectId(folderId));
        Folder folder =(Folder)object;
        OperationContext operationContext = cmisSession.createOperationContext();
        operationContext.setMaxItemsPerPage(maxItemsPerPage); 
        ItemIterable<CmisObject> children = folder.getChildren(operationContext);for(CmisObject child :children){
             System.out.println(child.getName());}

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/chemistry/opencmis/client/api/TransientCmisObject
at org.alfresco.cmis.client.impl.AlfrescoObjectFactoryImpl.convertObject(AlfrescoObjectFactoryImpl.java:348)
at org.apache.chemistry.opencmis.client.runtime.SessionImpl.getObject(SessionImpl.java:523)
at org.apache.chemistry.opencmis.client.runtime.SessionImpl.getObject(SessionImpl.java:493)
at org.apache.chemistry.opencmis.client.runtime.SessionImpl.getObject(SessionImpl.java:485)
at com.alfresco.api.example.CmisBasicQuery.doQuery(CmisBasicQuery.java:37)
at com.alfresco.api.example.CmisBasicQuery.doExample(CmisBasicQuery.java:23)
at com.alfresco.api.example.CmisBasicQuery.main(CmisBasicQuery.java:19)
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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.lang.ClassNotFoundException: org.apache.chemistry.opencmis.client.api.TransientCmisObject