The platform version of a JRE is the specification verison of the java spec, and for JDK9 is supposed to be 9.
however, we still have code in JREInfo.setPlatformByProduct() that tries to pars the old version string format, and failing that, falls back to returning the product version.
As a result, if jnlp file specified <java version="9"/> , you get the ssv dialog saying the version is not available and you should run with the latest version (9-ea).