Mac OS X and AIX contain only stubs for the SCTP channels. There are platform specific versions of the stubs for these platforms, so the build currently filters out the three channel implementation classes, on these platforms. But, there are other implementation classes in src/solaris/classes/sun/nio/ch/sctp that are needed for Linux and Solaris. These classes should be filter out also, on platforms that do not require them ( Mac OS X and AIX ).

Looking at rt. jar from a Mac JRE the superfluous classes can be seen:

$ jar -tvf rt.jar | grep "sun/nio/ch/sctp"
  2420 Thu Feb 27 23:47:08 GMT 2014 sun/nio/ch/sctp/AssociationChange.class <<< NOT NEEDED
   759 Thu Feb 27 23:47:08 GMT 2014 sun/nio/ch/sctp/AssociationImpl.class <<< NOT NEEDED
  2614 Thu Feb 27 23:47:04 GMT 2014 sun/nio/ch/sctp/MessageInfoImpl.class
  2607 Thu Feb 27 23:47:08 GMT 2014 sun/nio/ch/sctp/PeerAddrChange.class <<< NOT NEEDED
  2793 Thu Feb 27 23:47:08 GMT 2014 sun/nio/ch/sctp/ResultContainer.class <<< NOT NEEDED
  2850 Thu Feb 27 23:47:10 GMT 2014 sun/nio/ch/sctp/SctpChannelImpl.class
  2987 Thu Feb 27 23:47:10 GMT 2014 sun/nio/ch/sctp/SctpMultiChannelImpl.class
  7712 Thu Feb 27 23:47:08 GMT 2014 sun/nio/ch/sctp/SctpNet.class <<< NOT NEEDED
   251 Thu Feb 27 23:47:08 GMT 2014 sun/nio/ch/sctp/SctpNotification.class <<< NOT NEEDED
  1935 Thu Feb 27 23:47:10 GMT 2014 sun/nio/ch/sctp/SctpServerChannelImpl.class
  1379 Thu Feb 27 23:47:04 GMT 2014 sun/nio/ch/sctp/SctpStdSocketOption.class
  1953 Thu Feb 27 23:47:08 GMT 2014 sun/nio/ch/sctp/SendFailed.class <<< NOT NEEDED
  1239 Thu Feb 27 23:47:08 GMT 2014 sun/nio/ch/sctp/Shutdown.class <<< NOT NEEDED

Note: SctpStdSocketOption.class and MessageInfoImpl.class are platform independent, and needed to support parts of the API that are not dependent on an actual socket implementation.