The VM Options "-Xoss", "-Xsqnopause", "-Xoptimize" and "-Xboundthreads" are obsolete in JDK 9 and are ignored. Use of these options will result in a warning being issued in JDK 9 and they may be removed completely in a future release.

The VM Options "-Xoss", "-Xsqnopause", "-Xoptimize" options were already silently ignored for a long time.

The VM Option "-Xboundthreads" was only needed on Solaris 8/9 (when using the T1 threading library).