Accessing the CMS repository through a portlet

[robin_panicker]

Hi,
I need to access the list of files in the CMS storage.

I am trying the following in my portlet code

....

MBeanServer mbeanServer = MBeanServerLocator.locateJBoss();
CMS CMSService = (CMS)MBeanProxy.get(CMS.class, new ObjectName
("portal:service=CMS"), mbeanServer);


Command listCMD = CMSService.getCommandFactory
().createFolderGetListCommand(sPath);

Folder mainFolder = (Folder)CMSService.execute(listCMD);

List folders = mainFolder.getFolders();
List files = mainFolder.getFiles();

But i am getting a null pointer exception at CMSService.getCommandFactory().createFolderGetListCommand(sPath)

.....

Can someone please verify if this is the correct way to get a list of files and folders in the CMS repository?

thanks
Robin