Socket and ServerSocket supportedOptions() caches the supported options in a static field on the assumption that all implementations support the same set of options. This assumption is incorrect.
The cache can be on a per-socket basis ( which has been implemented in the webrev ), or maybe even removed completely and just defer to the impl. The reason I left the per-socket cache is to avoid creating the additional unmodifiable wrapper for every access ( Argh! why didn't we specify that SocketImpl::supportedOptions returns an unmodifiable set, then there would be no need for this defensive wrapper ) This should to be fixed in advance of JEP 337, which will use a RDMA SocketImpl that supports RDMA specific socket options. http://cr.openjdk.java.net/~chegar/8213418/webrev.00/ -Chris.
