The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.
The Sockets Direct Protocol (SDP) provides access to high performance network connections, such as that provided by InfiniBand. This trail shows how to enable SDP, which Java APIs are involved, and explains how it works.