The java launcher implementation currently checks for several non-standard old style (some as old as Java 1.2) options and converts them to Java Hotspot JVM specific options before launching the JVM.

Specifically, the following happens in the launcher:

-verbosegc converted to -verbose:gc
-noclassgc converted to -Xnoclassgc
-verify converted to -Xverify:all
-verifyremote converted to -Xverify:remote
-ss converted to -Xss
-oss converted to -Xoss --> (this one isn't even supported by the JVM)
-ms converted to -Xms
-mx converted to -Xmx

These non-standard options aren't currently documented. The java launcher should deprecate these options for removal in favour of the documented (Hotspot JVM specific) options.