Manifest generation does not seem to be working properly. https://bugs.eclipse.org/bugs/show_bug.cgi?id=379233
Other significant bugs still exist. Please see these release train bugs for a current list, and please report any other issues you discover:
368783: Server management UI bug train https://bugs.eclipse.org/bugs/show_bug.cgi?id=368783
368785: Server runtime support bug train https://bugs.eclipse.org/bugs/show_bug.cgi?id=368785
368782: Plugin packaging issues bug train https://bugs.eclipse.org/bugs/show_bug.cgi?id=368782
You can see all open bugs here.