Server Side Followup Action and the usage of Client Libs?

Hello,

I have to program a Server Side Followup Action (IOperationParticipant) for the "Save Workitem Action".

My Questions:
* Could I use in my Followup Action (IOperationParticipant) the Client Libs like SCMPlatform and TeamPlatform (com.ibm.team.repository.client.TeamPlatform)?
* When I use them I get "NotLoggedIn", but AbstractService.getAuthenticatedContributor() give me back a valid IContributorHandle and with itemService.fetchItem(contributorHandle, null) and some add. steps I get my Loginname.

The main question is the first one.

Thanks in advance

Stefan