How to get the author/creator of a certain IResource in Jazz? For
example, when clicking an element in the package explorer, it displays
its corresponding last author/creator.

Try:


IShareable shareable = (IShareable)resource.getAdapter(IShareable.class);
ISharingDescriptor desc = shareable.getShare().getSharingDescriptor();
ITeamRepository repo = RepositoryUtils.getTeamRepository
(desc.getRepositoryUri(), desc.getRepositoryId());

return SCMPlatform.getWorkspaceManager(repo).versionableManager
().fetchCompleteState(shareable.getRemote(), monitor).getModifiedBy();

- Dmitry