EXECUTE: Create Seam 2FP EAR project.
EXECUTE: New > Hibernate XML Mapping file.
EXECUTE: Select authentificator class and add it.
EXECUTE: Press Finish.
FAILURE: Error appears in generated file.

"The content of element type "class" must match "(meta*,subselect?,cache?,synchronize*,comment?,tuplizer*,(id|composite-id),discriminator?,natural-id?,(version|timestamp)?,(property|many-to-one|one-to-one|component|dynamic-component|properties|any|map|set|list|bag|idbag|array|primitive-array),((join,subclass*)|joined-subclass*|union-subclass*),loader?,sql-insert?,sql-update?,sql-delete?,filter*,resultset*,(query|sql-query)*)"."

On element: Authenticator.hbm.xml
In folder: seamEar-ejb/ejbModule/org/domain/seamear/session
Location: line 6

Vitaly said that in this generated file class id is missed. So there is an mistake in generator.